Publications
(201) US patent, US20210162388A1
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METAL ORGANIC FRAMEWORKS (MOFs) AND METHODS OF SYNTHESIZING AND USING THE SAME
Phuong Thi Kieu Nguyen, Quang Thien Luong, Thang Bach Phan, Y Bach Nhu Tran
Abstract: A new metal organic framework (MOF) series and method of synthesizing the same are disclosed which includes an organic linking ligand having the formula:and a metal ion bonded to the organic linking ligand.
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(200) Catalyst, (Q1, IF = 4.501)
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Book chapter "Application of Various Metal-Organic Frameworks (MOFs) as Catalysts for Air and Water Pollution Environmental Remediation"
Sanha Jang, Sehwan Song, Ji Hwan Lim, Han Seong Kim, Bach Thang Phan, Ki-Tae Ha, Sungkyun Park and Kang Hyun Park
Abstract: The use of metal-organic frameworks (MOFs) to solve problems, like environmental pollution, disease, and toxicity, has received more attention and led to the rapid development of nanotechnology. In this review, we discuss the basis of the metal-organic framework as well as its application by suggesting an alternative of the present problem as catalysts. In the case of filtration, we have developed a method for preparing the membrane by electrospinning while using an eco-friendly polymer. The MOFs were usable in the environmental part of catalytic activity and may provide a great material as a catalyst to other areas in the near future.
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(199) Advances in Natural Sciences: Nanoscience and Nanotechnology, Accepted, (Q2, IF = 2.26)
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Al-Fumarate metal-organic frameworks adsorbent for removal of organic compound and gas storage
Nguyen Thi Loan; Nguyen Thi Hiep; Tran Thi Thu Huong; Ung Thi Dieu Thuy; Tran Thi Thuong Huyen; Doan Tan Le Hoang; Nguyen Liem Quang
Abstract: To be updated!
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(198) RSC Advances, Accepted, (Q1, IF = 4.036)
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Functionalized silver nanoparticles for SERS amplification with enhanced reproducibility and for ultrasensitive optical fiber sensor in biochemical assay
Phuong, Nguyen Tran Truc ; Dang, Vinh Quang; Le, Hieu; Bach, Ta Ngoc; Khuyen, Bui Xuan; Ta, Hanh; Ju, Heongkyu; Phan, Thang Bach; Tran, Nhu Hoa Thi
Abstract: Plasmonic sensors have broad application potential in many fields and are promising to replace most bulky sensors in the future. There are various method-based chemical reduction processes for silver nanoparticle production with flexible structural shapes due to their simplicity and rapidity in nanoparticle fabrication. In this study, self-assembled silver nanoparticles (Ag NPs) with a plasmon peak at 424 nm were successfully coated onto –NH2-functionalized glass and optical fiber sensors. These coatings were rapidly produced via two denaturation reactions in plasma oxygen, respectively, and an APTES ((3-aminopropyl)triethoxysilane) solution was shown to have high strength and uniformity. With the use of Ag NPs for surface-enhanced Raman scattering (SERS), excellent results and good stability with the detection limit up to 10−10 M for rhodamine B and 10−8 M for methylene blue, and a signal degradation of only ∼20% after storing for 30 days were achieved. In addition, the optical fiber sensor with Ag NP coatings exhibited a higher sensitivity value of 250 times than without coatings to the glycerol solution. Therefore, significant enhancement of these ultrasensitive sensors demonstrates promising alternatives to cumbersome tests of dye chemicals and biomolecules without any complicated process.
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(197) ACS Materials Letters, Accepted, (Q1, IF = 11.17)
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Post-Synthetic Metalation of a New Metal–Organic Framework to Improve Methane Working Storage Capacity
Nguyen, Ha; Matheu, Roc; Diercks, Christian; Doan, Tan; Nguyen, Binh; Cordova, Kyle
Abstract: In the design of metal–organic frameworks (MOFs) for methane storage, a balance must be struck between the porosity of the MOF, the internal pore environment, the adsorption thermodynamics, and the density. Herein, we report the design of a new Zr-MOF, termed MOF-700, which was metalated with various Cu(II) salts to produce an isoreticular series of three new, highly porous MOFs (MOF-701, MOF-702, and MOF-703). The position of the metalated sites was determined by X-ray absorption spectroscopy, and the metalated frameworks were found to display high volumetric methane storage working capacities [206 cm3(STP) cm–3 at 298 K and 5.0–80.0 bar for MOF-701]. This constitutes an improvement of 50% over the performance of the parent MOF-700 [137 cm3(STP) cm–3] and highlights the prospect of optimization of methane working storage capacity by postsynthetic metalation.
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(196) Arabian Journal for Science and Engineering, Accepted, (Q2, IF = 2.334)
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ELECTROSORPTION OF Cu(II) and Zn(II) IN CAPACITIVE DEIONIZATION BY KOH ACTIVATION COCONUT-SHELL ACTIVATED CARBON
Le Thanh Nguyen HUYNH; Hoang Anh Nguyen; Hoang Vinh Nguyen; Thanh Nhut Tran; Thi Thanh Nguyen Ho; Le Hoang Tan Doan; Viet Hai Le; Thai Hoang Nguyen
Abstract: Capacitive deionization (CDI) is a simple, cost-efficient, and environmentally friendly method for brackish water desalination, and CDI technology also refers to heavy metal removal through the non-Faraday-process. In order to develop the highly electro-adsorptive electrode for heavy metal electrosorption via CDI process, a combination of biomass-derived activated carbon (AC) and nano-carbonaceous materials have been considered as a sustainable approach. In this study, the composite coconut-shell-derived AC@CNTs electrode with low CNTs content (1 wt%) was utilized for Cu(II) and Zn(II) removal. The surface properties of pristine AC and KOH-activated AC with nitrogen adsorption technique (BET) and scanning electron microscopy (SEM) are characterized. As calculated from BET measurements, surface area are 581 m2/g, 560 m2/g, and 552 m2/g, corresponding to AC-KOH-2@CNTs, AC-KOH-4@CNTs, and AC-KOH-6@CNTs. After KOH activation, a specific capacitance of AC-KOH-2@CNTs is significantly increased up to 133.7 F/g in comparison with 78.0 F/g of pristine AC. Furthermore, in the Cu(II) and Zn(II) removal performance, AC-KOH-2@CNTs achieved a significant average salt adsorption rate of 29.87 mg/g min and 25.27 mg/g min with a high salt adsorption (SAC) of 7.31 mg/g and 12.55 mg/g at the operation voltage of 1.2 V in 200 ppm CuSO4 solution and 200 ppm ZnSO4 solution, respectively.
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(195) Colloids and Surfaces A: Physicochemical and Engineering Aspect A, Accepted, (Q2, IF = 5.518)
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Engineering Biodegradable Periodic Mesoporous Functionalized-Organosilica Nanocarriers for Efficient Paclitaxel Delivery
Ngoc Xuan Dat Mai, Thu-Ha Thi Nguyen, Du Huy Nguyen, Linh Ho Thuy Nguyen, Hiep Thi Nguyen, Thang Bach Phan, Fuyuhiko Tamanoi, Long Binh Vong, Tan Le Hoang Doan
Abstract: Periodic mesoporous organosilica (PMO) materials have attracted considerable attention as promising nanocarriers to improve the therapeutic efficacy of anticancer drugs. Herein, a new type of biodegradable disulfide-based PMO was synthesized by incorporating disulfide linkers into the silica framework of nanoparticles (NPs). The homogeneous spherical morphology with an average size of 50 nm is observed by scanning electron microscope, transmission electron microscopy. Furthermore, the physicochemical characterizations were also performed by using Fourier transform infrared spectra and X-ray photoelectron spectroscopy confirmed the presence of disulfide in the structure of NPs. It is notable that the disulfide moieties incorporated into the structure of NPs lead to fast degradation, within 5 days to complete degradation. Paclitaxel (PTX), a hydrophobic anticancer drug, was loaded into the porous particles with a high loading capacity up to 602 mg.g−1. A large amount of PTX was released at the early stage of the release process in the phosphate buffer saline solution containing reduced glutathione and then released slowly at a steady rate. The effective cellular uptake of NPs into malignant cells and normal cells also demonstrated. PTX-loaded NPs exhibited higher anticancer activity against cancer cells as compared to free PTX, indicating the potential nanocarrier for cancer therapy.
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(194) Photonics and Nanostructures - Fundamentals and Applications, 47, 100973, (Q2, IF = 3.008)
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Enhanced birefringence for refractometric optical fiber sensor with titanium oxide
Nguyen Tan Tai; Ngo Quang Minh; Tran Ngoc Quyen; Dang Khoa vo Nguyen; Thang Bach Phan
Abstract: In this work, we presents the refractometric sensor based multimode optical fiber with titanium dioxide (TiO2) coating for measurement of the refractive index change of bulk media. The phase retardation, which is induced by the TiO2 coated optical fiber, was measured by homodyne detection system. The results show that the sensor detection limit was experimentally achieved around 5.67 × 10−8 (RIU) with an operating refractive index range of 7.5 × 10−5 (RIU), obtained at single operating wavelength of 632.8 nm without using spectroscopic techniques. Those features, with the sensor merits of highly sensitive device, have led to potential applications for biomedical and biochemical detection in label-free manner.
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(193) Acta Materialia, 214, 118415, (Q1, IF = 9.21)
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Coupling modification of Fermi level, band flattening and lattice defects to approach outstanding thermoelectric performance of ZnO films via tuning In and Ga incorporation
Anh Tuan Thanh Pham, Oanh Kieu Truong Le, Dung Van Hoang, Truong Huu Nguyen, Kuei-Hsien Chen, Sungkyun Park, Thang Bach Phan, Vinh Cao Tran
Abstract: Band structure modification is found one of the state-of-the-art strategies to control electrical, thermal transport properties, and optimize performance of thermoelectric (TE) materials. Despite being a high-temperature n-type TE material, low-dimensional ZnO structures, specifically thin films normally possess a poor performance due to instability, low electrical, and high thermal conductivities. Herein, it is found that the trade-offs between TE parameters of ZnO films can be simultaneously abated by co-doping In and Ga. The dual incorporation of In and Ga enhances crystallinity, thermal stability, and TE properties up to 573 K. Tuning In and Ga contents not only optimizes carrier concentration associating with Fermi level modification, but also engineers lattice defects contributing to scattering transport mechanisms. Furthermore, the In3+ compensation at substitutional sites, specifically at high temperature, significantly increases density-of-state effective mass due to conduction band flattening. As a result, the coupling modification of Fermi level, band flattening, and lattice defects leads to maintaining electrical conductivity at a medium degree, increasing Seebeck coefficient, and decreasing thermal conductivity, respectively. The TE dimensionless figure of merit (ZT) and power factor (PF) of the films deposited from the In0.01Ga0.04Zn99.95O compound significantly boost to 0.2 and 745.2 µW/mK2 at 573 K, respectively. These values are 1328 and 536% higher than pristine ZnO film; 400 and 258% greater than Ga single-doped ZnO film, respectively. It proposes that our ZnO-based thin films approach the high ZT region (ZT ≥ 0.2) of advanced nanostructured ZnO-based bulks.
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(192) The Journal of Physical Chemistry Letters, 13, 8192-8199, (Q1, IF = 6.888)
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Coupling amorphous Ni hydroxide nanoparticle with single-atom Rh on Cu nanowire arrays for highly efficient alkaline seawater electrolysis
Ngoc Quang Tran, Bao Thu Nguyen Le, Thong Nguyen-Minh Le, Le Thai Duy, Bach Thang Phan, Yeseul Hong, Thuy-Kieu Truong, Tan Le Hoang Doan, Jianmin Yu, Hyoyoung Leee
Abstract: Exploring efficient catalysts for alkaline seawater electrolysis is highly desired yet challenging. Herein, coupling single-atom rhodium with amorphous nickel hydroxide nanoparticles on copper nanowire arrays is designed as a new active catalyst for the highly efficient alkaline seawater electrolysis. We found that an amorphous Ni(OH)2 nanoparticle is an effective catalyst to accelerate the water dissociation step. In contrast, the single-atom rhodium is an active site for adsorbed hydrogen recombination to generate H2. The NiRh-Cu NA/CF catalyst shows superior electrocatalytic activity toward HER, surpassing a benchmark Pt@C. In detail, the NiRh-Cu NA/CF catalyst exhibits HER overpotentials as low as 12 and 21 mV with a current density of 10 mA cm–2 in fresh water and seawater, respectively. At high current density, the NiRh-Cu NA/CF catalyst also exhibits an outstanding performance, where 300 mA cm–2 can be obtained at an overpotential of 155 mV and shows a slight fluctuation in the current density over 30 h.
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(191) Sensors and Actuators: A. Physical, (Q1, IF = 4.29)
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Gold nanoparticles are capped under the IRMOF-3 platform for in-situ Surface-Enhanced Raman Scattering technique and optic fiber sensor
Nguyen La Ngoc Tran, Bach Thang Phan, Hanh Kieu Thi Ta, Tran Thi Kim Chi, Bui thi Thu Hien, Nguyen Tran Truc Phuong, Chi Cuong Nguyen, Tan Le Hoang Doan, Nhu Hoa Thi Tran
Abstract: Integrating noble-metal and organic-inorganic hybrid crystalline porous materials for Raman signal augmentation is crucial for surface-enhance Raman spectroscopy. This study effectively generated gold nanoparticles / metal-organic frameworks (Au NPs/IRMOF-3) hybrids. The activity of Au NPs/IRMOF-3 double component substrate was significantly enhanced under localized surface plasmon resonance (LSPR) because the hot electrons produced on Au NPs surface were incorporated with IRMOF-3 and utilized the porous structure to capture the analyte. Development much hot spots of great significance for surface-enhanced Raman scattering (SERS) technique, herein, we developed an Au NPs/IRMOF-3-based nanosensor rhodamine B (RhB) sensing by using in-situ SERS technique. X-ray diffraction (XRD) spectrometry, surface morphology analysis, optical properties, and energy-dispersive X-ray (EDX) spectroscopy were used to examine the layer-by-layer deposited substrate. The Au NPs/IRMOF-3 multilayers generated chemical and electromagnetic amplification of Raman signals of Rhodamine B at a low concentration and high enhancement factor. In the presence of dopamine molecules, due to the strong specific affinity between the modified surface out-layer of fiber sensor and the target molecules, resulting in the obvious change of the optical power transmission signals, which can be used for dopamine sensing with high sensitivity and stability (limit of detection is 1.42×10-18 M with a wide linear range from 10-17 to 6×10-8 M of dopamine). The Au NPs/IRMOF-3 nanosensor can be used as an ideal platform for real applications, especially for some gases or low-weight molecules in the future.
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(190) Journal of Porous Material, (Q2, IF =2.523)
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Turning fluorescent silica nanoparticles for the removal and detection of 4-nitrophenol
Tien Thi My Le, Ngoc Xuan Dat Mai, Hanh Thi Kieu Ta, Tan Le Hoang Doan, Linh Ho Thuy Nguyen
Abstract: 4-Nitrophenol (4-NP) is a dangerous compound that can be found in insecticides and pesticides in agriculture. Therefore, removing and detecting this compound in water sources are essential for the ecosystem and human health. In this study, we synthesized fluorescence-incorporated mesoporous nano silica (F-NS) for the removal and detection of 4-NP. The fluorescent nanomaterial was characterized by techniques, including Fourier-transform infrared spectroscopy, thermal gravimetric analysis, nitrogen adsorption isotherms, and scanning electron microscope. The isotherm and kinetics investigation showed that 4-NP adsorption of the nanomaterial with high capacity (up to 0.7 mg mg−1) was well fitted with the multilayer adsorption and the pseudo-second-order model. Furthermore, modulation of the fluorescein isothiocyanate amount on the nanomaterial allowed the detection of 4-NP at low concentrations through fluorescence quenching.
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(189) RSC Advances, 12, 26383, (Q1, IF = 4.036)
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Influence of structure phase transition on the thermoelectric properties of Cu2Se1xTex liquidlike compounds
Trung Kien Mac, Thi Thu Ta, Huu Tuan Nguyen, Van Du Nguyen, Thi Lan Huong Pham, Van Thiet Duong, Tran Dang Thanh, Bach Thang Phan, and Anh Tuan Duong
Abstract: Copper chalcogenide Cu2(Se,Te) compounds are well known as typical p-type thermoelectric materials with a figure of merit (ZT) that can be optimized by the ratio of Se : Te. Here, by using the mechanical alloying and solid-state reaction methods, Te was substituted into Se sites within Cu2Se as the formula Cu2Se1−xTex (x = 0.1, 0.2, 0.25, and 0.3). The observed changes in structural phase, grain morphologies, and grain size were recorded by XRD and FE-SEM imaging with the appearance of the secondary phase of Cu2Te, with a Te content of x = 0.25. The layered structure morphology was observed more clearly at the high Te content. The electrical conductivity was greatly increased with enriched Te content while the maximum Seebeck coefficient was obtained in the Cu2Se0.75Te0.25 sample. Accordingly, a power factor value of up to 9.84 μW cm−1 K−2 at 773 K was achieved. The appearance of a Cu2Te phase with a Te content of 0.25 created a structural phase transition which results in a ZT value of 1.35 at 773 K in the Cu2Se0.75Te0.25 sample.
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(188) ACS The Journal of Physical Chemistry C, Accepted, (Q1, IF = 4.177)
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Emergence of different replica Dirac cones and intra- and intervalley scatterings in short-wavelength graphene superlattices modulated by an atomic-scale sharp potential
Nam Hoang Vu, Hieu Van Le, Thang Bach Phan, Nam Thoai, Toan The Nguyen, Hung Minh Le, Yoshiyuki Kawazoe, and Thi Minh Cao,
Abstract: Here, we calculate the unfolded band structure of short-wavelength graphene superlattices modulated by the atomic-scale sharp potential of a semiconductor surface, using density functional theory. We show that in the case of the superlattice graphene Brillouin zone (SBZ) center folded into the primitive graphene Brillouin zone (GBZ) corner, the emergence of different replica Dirac cones and their scattering behaviors are driven by the substrate-induced potential or atomic-scale disorders as well as by the correlation between the rotation angle of the superlattice and the trigonal warping orientation of the Dirac cone because of the quantum interference associated with the scattering at the SBZ edge. In particular, a superlattice with a rotational angle of φ = 30° (G–N√3 × N√3–R30°, N > 1) facilitates intervalley scattering, whereas an unrotated superlattice (G–N3 × N3) is favorable to intravalley scattering. For a superlattice with a rotational angle in the range of 0 < φ < 30°, the intervalley and intravalley scatterings may be comparable to each other, leading to the emergence of mixed inequivalent replica cones at the SBZ center (or GBZ corner). Interestingly, such inequivalent replica cones facilitate a stronger intervalley scattering at the GBZ corner, compared to the G–N√3 × N√3–R30° and G–N3 × N3 superlattices, thus opening a larger energy gap at the primitive Dirac point. In addition to the inversion symmetry breaking in graphene, we show that intervalley scattering can also generate an energy gap at the secondary Dirac point.
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(187) Sensors and Actuators A: Physical, 346, 113816, (Q1, IF = 4.291)
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Detection of carbendazim by utilizing multi-shaped Ag NPs decorated ZnO NRs on patterned stretchable substrate through surface-enhanced Raman scattering effect
Hoai Nhan Luong, Nhat Minh Nguyen, Cong Khanh Tran, Thanh Tam Nguyen, Ngoc Phuong Nguyen, Tran My Hoa Huynh, Thanh Tung Tran, Bach Thang Phan, Thanh Van Tran Thi, Vinh Quang Dang
Abstract: Although the carbendazim (CBZ) residue is one of the most commonly active ingredients used in the world for fungicidal application on fruit trees, it has serious effects on human health. There have been many studies on the detection of carbendazim in solution or on rigid substrates by surface-enhanced Raman scattering (SERS) effect. Nevertheless, the analyzing process have some limitations. In particular, the rigid substrates are not tightly placed on uneven surfaces and the solution must be treated before analyzing. Therefore, in this report, CBZ was detected via a 3D SERS substrate in which ZnO nanorods (ZnO NRs) decorating with multi-shaped silver nanoparticles (MAg NPs) are developed on polydimethylsiloxane (PDMS). The SERS substrate possessing highly rough nanostructures can increase the scattering of laser and absorption of substances detected on PDMS film. Besides, a CBZ detection limit is calculated with the value of 10 -3 ppm based on Raman spectroscopy. The 3D SERS substrate enables a new researching field of detecting organic residues in agricultural products.
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(186) Journal of Analytical Science and Technology, 13(1), 28, (Q1, IF = 3.568)
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Isolation of DNA from Arthrospira platensis and whole blood using magnetic nanoparticles (Fe3O4@OA and Fe3O4@OA@SiO2)
Lien‑Thuong Thi Nguyen, Ngoc‑Hanh Thi Le, Hanh Kieu Thi Ta and Khoa Dang Nguyen
Abstract: Magnetic nanoparticles (MNPs) provide a fast, cost-effective, and organic-free method for DNA isolation. In this paper, we synthesized MNP coated with oleic acid (Fe3O4@OA) and silica nanoparticles (Fe3O4@OA@SiO2), characterized the properties of MNP using TEM, VSM, and FTIR, and investigated their efficiency in DNA isolation from cyanobacteria. The yield and quality of isolated DNA were evaluated and compared with those from animal blood and those obtained by the silica column or organic solvents. The results showed the successful preparations of Fe3O4@OA and Fe3O4@OA@SiO2 with superparamagnetic behaviors and a mean diameter of 7 nm and 106 nm, respectively. The FTIR spectra of Fe3O4@OA confirmed the bonding of OA to the surface of iron oxide, while those of Fe3O4@OA@SiO2 showed the exposed silanol groups. Although MNPs yielded a lower quantity of DNA compared with phenol/chloroform extraction, they showed the potential protection of the integrity of DNA against centrifugal and shear forces. Fe3O4@OA@SiO2 favored more nucleic acid absorption than Fe3O4@OA, producing a 1.2 and 1.6 times greater amount of DNA from Arthrospira platensis and animal blood respectively. The purity of DNA isolated from Arthrospira platensis was also higher than that of animal blood. These findings indicate a new and simple approach for the isolation of DNA from Arthrospira genus.
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(185) Journal of Science: Advanced Materials and Devices, Accepted, (Q1, IF = 7.38)
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Fabrication of in situ crosslinking hydrogels based on oxidized alginate/N,O-carboxymethyl chitosan/β-tricalcium phosphate for bone regeneration
Binh Thanh Vu, Van My Hua, Tuan-Ngan Tang, Nhi Ngoc-Thao Dang, Hang ThiThuy Cao, Thang Bach Phan, Hanh Thi-Kieu Ta, Viet Hung Pham, Quyen Ngoc Tran, Thanh Dinh Le, Toi Van Vo, and Hiep Thi Nguyen
Abstract: In this study, hydrogels based on in situ crosslinking between oxidized alginate (OA) and N,O-carboxymethyl chitosan (NOCC) in combination with β-tricalcium phosphate (β-TCP) were prepared using different OA concentrations and OA to NOCC ratios. Various hydrogel characterizations were examined and revealed the strong effect of OA concentrations and NOCC contents on the ability of hydrogel formation, swelling degree, degradability and compression strength. Besides, Schiff's base crosslinking between aldehyde groups of OA and amino groups of NOCC, indicating hydrogel formation, was confirmed via Fourier transform infrared spectroscopy (FT-IR) spectra. The presence of β-TCP in hydrogels was also confirmed by FT-IR, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) images. Furthermore, most hydrogels were non-cytotoxic and expressed the capability for cells to penetrate, migrate and exchange nutrients and oxygen. Besides, further experiments demonstrated their in vivo biocompatibility. Generally, the results suggested that hydrogels based on 3% (w/v) OA, 3% (w/v) NOCC (OA:NOCC volume ratio is 1:3) and 20% (w/w) β-TCP have the potential for bone regeneration.
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(184) Polymers, 14, 17, 3541, (Q1, IF = 4.967)
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Optimization of Oligomer Chitosan/Polyvinylpyrrolidone Coating for Enhancing Antibacterial, Hemostatic Effects and Biocompatibility of Nanofibrous Wound Dressing,
Vinh Khanh Doan, Chien Minh Tran, Trinh Thi-Phuong Ho, Linh Kim-Khanh Nguyen, Yen Ngoc Nguyen, Ngan Tuan Tang, Tin Dai Luong, Nhi Ngoc-Thao Dang, Nam Minh-Phuong Tran, Binh Thanh Vu, Hoai Thi-Thu Nguyen, Quyen Thuc Huynh, Hien Quoc Nguyen, Chien Mau Dang, Thang Bach Phan, Hanh Thi-Kieu Ta, Viet Hung Pham, Thanh Dinh Le, Toi Van Vo, Hiep Thi Nguyen
Abstract: A synergistic multilayer membrane design is necessary to satisfy a multitude of requirements of an ideal wound dressing. In this study, trilayer dressings with asymmetric wettability, composed of electrospun polycaprolactone (PCL) base membranes coated with oligomer chitosan (COS) in various concentrations of polyvinylpyrrolidone (PVP), are fabricated for wound dressing application. The membranes are expected to synergize the hygroscopic, antibacterial, hemostatic, and biocompatible properties of PCL and COS. The wound dressing was coated by spraying the solution of 3% COS and 6% PVP on the PCL base membrane (PVP6–3) three times, which shows good interaction with biological subjects, including bacterial strains and blood components. PVP6–3 samples confirm the diameter of inhibition zones of 20.0 ± 2.5 and 17.9 ± 2.5 mm against Pseudomonas aeruginosa and Staphylococcus aureus, respectively. The membrane induces hemostasis with a blood clotting index of 74% after 5 min of contact. In the mice model, wounds treated with PVP6–3 closed 95% of the area after 10 days. Histological study determines the progression of skin regeneration with the construction of granulation tissue, new vascular systems, and hair follicles. Furthermore, the newly-growth skin shares structural resemblances to that of native tissue. This study suggests a simple approach to a multi-purpose wound dressing for clinical treatment.
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(183) RSC Advances, 12, 19741-19750, (Q1, IF = 4.036)
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Ionic liquid-immobilized silica gel as a new sorbent for solid-phase extraction of heavy metal ions in water samples
Thai The Nguyen, Tu-Hoai Duy Nguyen, Tam Thanh Thi Huynh, Minh-Huy Dinh Dang, Linh Ho Thuy Nguyen, Tan Le Hoang Doan, Thinh Phuc Nguyen, Mai Anh Nguyen, Phuong Hoang Tran
Abstract: In the current study, we have developed a solid-phase extraction (SPE) method with novel C18-alkylimidazolium ionic liquid immobilized silica (SiO2–(CH2)3–Im–C18) for the preconcentration of trace heavy metals from aqueous samples as a prior step to their determination by inductively coupled plasma mass spectrometry (ICPMS). The material was characterized by Fourier-transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA), Energy-Dispersive X-ray Spectroscopy (EDS), and Brunauer–Emmett–Teller (BET) analysis. A mini-column packed with SiO2–(CH2)3–Im–C18 sorbent was used for the extraction of the metal ions complexed with 1-(2-pyridylazo)-2-naphthol (PAN) from the water sample. The effects of pH, PAN concentration, length of the alkyl chain of the ionic liquid, eluent concentration, eluent volume, and breakthrough volume have been investigated. The SiO2–(CH2)3–Im–C18 allows the isolation and preconcentration of the heavy metal ions with enrichment factors of 150, 60, 80, 80, and 150 for Cr3+, Ni2+, Cu2+, Cd2+, and Pb2+, respectively. The limits of detection (LODs) for Cr3+, Ni2+, Cu2+, Cd2+, and Pb2+ were 0.724, 11.329, 4.571, 0.112, and 0.819 μg L−1, respectively with the relative standard deviation (RSD) in the range of 0.941–1.351%.
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(182) Materials Letters, 324, 132798, (Q1, IF = 3.574)
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Microstructural and Thermoelectric Properties of PbTe Single Crystals as grown by Czochralski Method
Tosawat Seetawan, Athron Vora-Ud, Fawad Ullah, Phan Bach Thang, Manish Kumar, Hong Joo Kim,
Abstract: A single crystal of Lead Telluride (PbTe) has been grown by Czochralski technique. The microstructure of PbTe alloy as grown showed the cubic rock salt (NaCl) structure as confirmed by the XRD and TEM results. The composition of Pb:Te ratio of around 1:1.1 was indicated the Te-rich. The effect of temperature has induced the transport of charges after intrinsic excitation of PbTe to be changed the Seebeck coefficient (S) values of positive (p-type) at low-temperature range (<550 K) to the negative (n-type) at high-temperature range (>550 K). The maximum thermoelectric power factor (PF) of p-type is 1.91 mW m−1 K−2 at room temperature (RT) and n-type is 0.063 mW m−1 K−2 at 673 K to be concluded the value of p-type more than n-type around two orders of magnitude. The maximum dimensionless figure of merit (ZT) value is around 0.41 at 300 K.
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(181) Sensors and Actutors B: Chemical, 367, 132094, (Q1, IF = 9.211)
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Sulfate-functionalized hafnium-organic frameworks as a highly effective chemiresistive sensor for detecting hazardous NH3 at low-temperature
Minh-Huy Dinh Dang, Sachin Navale, Dong Hoon Yang, Linh Ho Thuy Nguyen, Ngoc Xuan Dat Mai, Thang Bach Phan, Hyoun Woo Kim, Tan Le Hoang Doan, Sang Sub Kim
Abstract: This study proposes a solvothermal method for synthesizing sulfate-functionalized hafnium-organic frameworks (Hf-BTC-SO4) for application in low-temperature NH3 gas sensors. Prior to the gas-sensing studies, solvothermal-processed Hf-BTC-SO4 is characterized using various techniques to obtain structural, elemental, morphological, and thermal stability information. Results of structural and thermal-stability analysis demonstrate that Hf-BTC-SO4 exhibits good crystallinity and high thermal stability with the functionalization of SO4 in the Hf-framework. Microstructural analysis reveals that nanoparticles aggregated to form compact clusters of Hf-BTC-SO4. In addition, Hf-BTC-SO4 has an ultra-high specific surface area of 1100 m2g−1 (with a pore size of 15 Å), suitable for gas detection owing to enhanced surface reactions. Gas-sensing studies confirm that the fabricated Hf-BTC-SO4 sensor exhibits selective detection of NH3 gas at a lower working temperature of 100 ºC. Notably, the Hf-BTC-SO4 sensor detected up to 1 ppm of NH3 (response = 1.41), with excellent response reversibility. The functionalized sulfate bonds and Hf-clusters within the framework form strong bonds with NH3, enhancing their interaction with the metal-organic frameworks. This study can motivate future research on the synthesis of functional organic frameworks for applications in low-temperature NH3 detection devices.
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(180) Sensors and Actutors B: Chemical, 368, 132120, (Q1, IF = 9.211)
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Novel Amine-Functionalized Zinc-Based Metal-Organic Framework for Low-Temperature Chemiresistive Hydrogen Sensing
Dong Hoon Yang, Trang Thi Thu Nguyen, Sachin Navale, Linh Ho Thuy Nguyen, Y Thi Dang, Ngoc Xuan Dat Mai, Thang Bach Phan, Jin-Young Kim, Tan Le Hoang Doan, Sang Sub Kim, Hyoun Woo Kim
Abstract: Low-temperature operating chemiresistive gas sensors are attractive for a variety of real-time gas monitoring applications, with benefits such as low power consumption, profitability, and miniaturization of devices. In this regard, we developed a low-temperature operating H2 gas sensor using solvothermal-processed novel amine-functionalized zinc-based metal-organic framework (Zn-BDC-NH2) as a detection material. The Zn-BDC-NH2 structure is consists of the Zn4O secondary building units and 2–aminoterephthalate acidic linker that form the 3D frame structure. Prior to sensing studies, various techniques were employed to confirm -NH2 functionalization and to characterize structure, surface morphology, thermal stability, surface area, and surface chemistry of synthesized Zn-BDC-NH2 materials. Benefitting from the simple synthesis process and larger surface area (880 m2g-1) with adequate porosity (~13 Å), Zn-BDC-NH2 has proven to be an excellent chemiresistive sensor for the effective sensing of low concentrations of H2 at 50 °C. Moreover, the sensor shown significant sensitivity to the detection of lower H2 concentrations of 1–10 ppm, a response value of 2.93–10 ppm H2, and complete recovery characteristics at 50 °C. We discussed the mechanisms for attaining the excellent H2 sensing. The utilized room temperature solvothermal approach opens up a perspective for synthesizing Zn-BDC-NH2 material with suitable functionalities and their use in low temperature H2 sensors.
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(179) Microporous and Mesoporous Materials, 338, 111944, (Q1, IF = 5.876)
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Facile synthesis of novel fluorescent organosilica-coated MOF nanoparticles for fast curcumin adsorption
Trang Thi Thu Nguyen, Bao Quang Gia Le, Minh-Huy Dinh Dang, Bach Thang Phan, Ngoc Xuan Dat Mai, Tan Le Hoang Doan
Abstract: Nano metal-organic framework materials are progressively being investigated and used as drug carriers in the biomedical field. Curcumin, an active component derived from turmeric, is commonly utilized in traditional medicine and can support cancer treatment. In this study, ZIF-8 nanomaterial was effectively modified with fluorescence organosilica coating, named ZIF-8@BPMO, to promote bio-interaction and prevent material flocculation. Powder X-ray diffraction (PXRD), infrared spectroscopy (FT-IR), differential gravimetric analysis (TGA), and isothermal nitrogen adsorption at 77 K were utilized to investigate the synthesized materials. Property analysis revealed that ZIF-8@BPMO nanomaterials had high crystallinity, a large surface area, and a high thermal stability with a particle size of 100 nm. According to the research, this material had high curcumin adsorption capacity of 666 mg g-1 for 15 min. Curcumin adsorption on the nanomaterial followed a pseudo-second-order kinetic model and the Freundlich model. Furthermore, thermodynamic investigations demonstrated an endothermic and spontaneous adsorption mechanism. These results indicate that the fluorescent ZIF-8@BPMO nanoparticle is a potential material for bio-applications.
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(178) Journal of Industrial and Engineering Chemistry, In press, (Q1, IF = 6.76)
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An effective combination of reusable Pd@MOF catalyst and deep eutectic solvents for high-performance C-C coupling reaction
Minh-Huy Dinh Dang, Trang Thi Thu Nguyen, Linh Ho Thuy Nguyen, Ngoc Xuan Dat Mai, Phuong Hoang Tran, Tan Le Hoang Doan
Abstract: Pd-incorporated Zr-based metal–organic framework containing sulfone groups, named Pd(II)BUT-11, was successfully prepared by dispersing the sulfone-functionalized MOF in Pd(OAc)2 solution. X-ray diffraction, scanning electron microscopy, N2 isotherm sorption, X-ray photoelectron spectroscopy, and thermogravimetric analysis were applied to determine the features of the Pd-incorporated MOF. In the catalytic studies, Pd(II)@BUT-11 was shown to be an efficient heterogeneous catalyst for synthesizing various stilbene derivatives via the cross-coupling Heck reaction with DABCO-derived deep eutectic solvent (DES) as a green solvent. Notably, the catalyst and the solvent could be recovered and reused, with their activity and structure remaining stable throughout several trials. The method provides an alternative solution to the conventional catalysts and solvents, resulting in a green and efficient stilbene synthesis process. Furthermore, the stilbenes were separated by extraction with ethyl acetate due to the low solubility of DES with this solvent.
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(177) New Journal of Chemistry, 46, 6630-6635, (Q1, IF = 3.925)
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Pore Engineering of Biomolecule-Based Metal–Organic Framework Nanocarriers for Improving Loading and Release of Paclitaxel
Linh Ho Thuy Nguyen, Trang Thi Thu Nguyen, Y Thi Dang, Bao Quang Gia Le, Ngoc Xuan Dat Mai, Ha Van Nguyen, Minh-Tri Le, Thang Bach Phan, Tan Le Hoang Doan
Abstract: There has been growing interest in employing metal–organic frameworks (MOFs) incorporated with biomolecules, known as b-MOFs, in biomedical applications. However, it is difficult and challenging to synthesize these materials at the nanoparticle size because of their complex structures constructed from long organic linkers. Herein, we demonstrate the facile and successful synthesis of b-Zn-BPDC and b-Zn-azoBDC, nano-b-MOFs containing nucleobase adenine as biomolecular building blocks, by utilizing surfactants and a post-synthesis linker-exchange method, respectively. Due to its large pore size (26 Å), the linker-exchanged MOF nanomaterial exhibited a higher loading capacity of paclitaxel (PTX), a water-insoluble anticancer drug, than its original framework (948.11 vs. 713.43 mg g−1). Furthermore, the release profiles of PTX loaded b-MOF nanomaterials in phosphate buffered saline (PBS) displayed an increase in PTX solubility with a substantial initial drug release, followed by a progressive release over time. These results suggested that nano-b-MOFs can deliver hydrophobic anticancer drugs.
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(176) Materials Letters, 320, 132403, (Q2, 3.574)
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Anticoagulation properties of virgin coconut oil-loaded electrospun polyurethane/polycaprolactone membrane
Huy Nguyen, Nghi Nguyen, Nam Tran, Thien Nguyen, Quang Nguyen, Thang Phan, Hanh Ta, Toi Vo, Thi-Hiep Nguyen
Abstract: This study aims to produce an electrospun polyurethane/polycaprolactone (PU/PCL) membrane loaded with virgin coconut oil (VCO) for improved antithrombogenicity. The results showed that the addition of VCO plays a remarkable role in mitigating blood cells adhesion, promoting anti-coagulation and aiding cell adhesion.
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(175) Vacuum, 202, 111137, (Q1, IF = 4.11)
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Enhancing thermoelectric power factor of transparent Sb-doped ZnO films for hybrid thermoelectric-photovoltaic applications
Anh Tuan Thanh Pham, Trang Thuy Thi Phan, Ngoc Duong Le, Dung Van Hoang, Truong Nguyen, Oanh Kieu Truong Le, Thang Bach Phan, and Vinh Tran
Abstract: ZnO is known as a wide-bandgap transparent thermoelectric material. Herein, the electronic transport and temperature-dependent thermoelectric properties of transparent Sb-doped ZnO (SZO) films are reported. The sputtered SZO films prepared at the optimum deposition temperature of 673 K show an n-type semiconducting behavior with the highest thermoelectric power factor of 406 μW/mK2 at 773 K, and a good transmittance ∼82% in the wavelength region of 400–1100 nm. It can well meet the requirements for transparent thermoelectric thin films. Through X-ray diffraction, UV–Vis, and photoluminescence analyses, the Zn2+ substitution by Sb5+ can be elucidated for significantly enhancing the Seebeck coefficient and thermoelectric power factor due to the increase of density-of-state effective mass.
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(174) Journal of Science: Advanced Materials and Devices, 7, 2, 100438, (Q1, IF = 7.382)
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Superior organic dye removal by CoCr2O4 nanoparticles: Adsorption kinetics and isotherm
Pham Kim Ngoc, Trung Kien Mac, Huu Tuan Nguyen, Tran Dang Thanh, Pham Van Vinh, Bach Thang Phan, Anh Tuan Duong, Raja Das
Abstract: In the present work, we report on the dye removal efficiency of Cobalt chromite, CoCr2O4 nanoparticles synthesized via the solvothermal method. The obtained CoCr2O4 nanoparticles demonstrated that the dye removal efficiency of CoCr2O4 nanoparticles could be enhanced by a reduction of size or improved water dispersibility. The pseudo-second-order kinetic model best describes the adsorption of Congo red (CR) dye on CoCr2O4 nanoparticles. The Langmuir adsorption isotherm model fitted best for the adsorption process and the adsorption capacity for CCO@450 and CCO@550 nanoparticles were found to be 59.4 and 43.8 mg g−1, respectively. Dye adsorption studies on a mixture of CR, MB, and RhB dyes solution revealed that the MB removal efficiency of CoCr2O4 nanoparticles could improve to 81% compared to 55% in solo MB solution. With the ease of use, high stability, diverse working environment, and superior adsorption capacity, CoCr2O4 nanoparticles have the potential to be used as an organic dye removal adsorbent for wastewater treatment.
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(173) Arabian Journal for Science and Engineering, Accepted, (Q2, IF = 2.807)
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Studying Electronic and Thermoelectric Properties of Ga-doped ZnO using Rigid Band Model
Hieu T. Hoang, Dai Cao Truong, Nguyen Huynh Tuan Anh, Yoshiyuki Kawazoe, Do Duc Cuong, Bach Thang Phan
Abstract: A combination of a first-principles electronic structure and Boltzmann transport calculations was used to study the electronic and thermoelectric properties of Ga-doped ZnO (GZO). Band structure of GZO showed rigid-like behavior with that of pristine ZnO; however, the only difference was seen in the position of Fermi level due to an additional electron. Therefore, the thermoelectric properties of GZO were found to show similar behavior with pristine ZnO. We suggest that it is possible to control the carrier concentration of the doped system by controlling the Ga concentration, which can optimize the power factor of GZO.
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(172) RSC Advances, 12, 355-364, (Q1, IF = 4.036)
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A confinement of N-heterocyclic molecules in a metal–organic framework for enhancing significant proton conductivity
My V Nguyen, Thang B Phan, Man V Tran, Tuyet AT Nguyen, Hung N Nguyen
Abstract: A series of N-heterocyclic⊂VNU-23 materials have been prepared via the impregnation procedure of N-heterocyclic molecules into VNU-23. Their structural characterizations, PXRD, FT-IR, Raman, TGA, 1H-NMR, SEM-EDX, and EA, confirmed that N-heterocyclic molecules presented within the pores of parent VNU-23, leading to a remarkable enhancement in proton conductivity. Accordingly, the composite with the highest loading of imidazole, Im13.5⊂VNU-23, displays a maximum proton conductivity value of 1.58 × 10−2 S cm−1 (85% RH and 70 °C), which is ∼4476-fold higher than H+⊂VNU-23 under the same conditions. Remarkably, the proton conductivity of Im13.5⊂VNU-23 exceeds the values at 85% RH for several of the reported high-performing MOF materials. Furthermore, Im13.5⊂VNU-23 can retain a stable proton conductivity for more than 96 h, as evidenced by FT-IR and PXRD analyses. These results prove that this hybrid material possesses potential applications as a commercial proton exchange membrane fuel cell.
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(171) Applied Surface Science, 581, 152325, (Q1, IF = 7.392)
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In-depth understanding of the photoreduction of graphene oxide to reduced-graphene oxide on TiO2 surface: statistical analysis of X-ray photoelectron and Raman spectroscopy data
Thuy Thanh Doan Nguyen, De Nguyen, Hoan Ngoc Doan, Phu Phong Vo, Vu Tan Huynh, Van Ha Hoang, Thang Bach Phan, Kenji Kinashi, Phuong Tuyet Nguyen
Abstract: In UV-assisted photoreduction of graphene oxide (GO) using TiO2, TiO2 supplies photogenerated electrons to reduce GO, which exhibits enhanced electrical conductivity, and induce a chemical interaction between TiO2 and reduced-GO (rGO) for improved charge separation. Here, we investigated the photosynthesis of the TiO2–rGO composite with varying the UV irradiation time, TiO2 source (TiO2-D or –HT, commonly employed in dye-sensitized solar cells), and light power. The final products were characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, and field-emission scanning electron microscopy. Most importantly, the chemical interaction between the rGO matrix and TiO2 was confirmed by X-ray photoelectron spectroscopy (XPS), whereas the carbon defects were studied by Raman spectroscopy. As expected, the chemical interaction between the rGO matrix and TiO2 was confirmed by the formation of Ti–O–C and Ti–C bonds. Moreover, during UV irradiation, the concentration of carbon defects increased evenly, implying that the photodegradation occurred simultaneously with the photoreduction of GO. The XPS and Raman data were further subjected to statistical analyses, including principal component analysis, multivariate linear regression and analysis of variance (ANOVA), and ANOVA–simultaneous component analysis. The results indicated that the irradiation time and TiO2 source had the highest impacts on the final products.
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(170) Applied Surface Science, 583, 152526, (Q1, IF = 7.392)
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New record high thermoelectric ZT of delafossite-based CuCrO2 thin films obtained by simultaneously reducing electrical resistivity and thermal conductivity via heavy doping with controlled residual stress
Dung Van Hoang, Anh Tuan Thanh Pham, Takahiro Baba, Truong Huu Nguyen, Thu Bao Nguyen Le, Thuy Dieu Thi Ung, Jongill Hong, Jong-Seong Bae, Hongjun Park, Sungkyun Park, Isao Ohkubo, Takao Mori, Vinh Cao Tran, Thang Bach Phan
Abstract: Defect engineering can effectively modulate the band structure of a thermoelectric (TE) material, thereby enhancing its power factor S2σ. Furthermore, residual stress engineering influences the film performance, especially in the planar technologies. For the TE Mg-doped CuCrO2-based materials, the limitations in achieving an outstanding figure of merit, ZT, arise from their characteristically low charge carrier mobility and high thermal conductivity. Herein, we propose a combination of defect engineering and stress engineering via heavy doping CuCr1-xMgxO2 with × = 0.15 at different deposition temperatures to overcome the aforementioned limitations. Combining the compressive residual stress with multiscale defects (point defects, grain boundaries, and nano-inclusions) significantly reduces the thermal conductivity (κ) to 0.44 W/mK. The σ of the films shows a remarkable enhancement because of point defects introduced via heavy doping. Notably, the compressive-stressed films exhibit higher ZT values, compared to the tensile-stressed films. As a result, an outstanding approximated ZT of 0.66 is observed in the compressive-stressed CuCr0.85Mg0.15O2 films, overcoming the limitations of its ZT value observed for the past two decades.
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(169) Applied Physics Letters, 120, 063902, (Q1, IF = 3.971)
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Tailoring orientation of microstructure for improving thermopower factor in Mg-doped CuCrO2 thick films
Dung Van Hoang, Anh Tuan Thanh Pham, Truong Huu Nguyen, Hoa Thi Lai, Dai Cao Truong, Thu Bao Nguyen Le, Thuy Dieu Thi Ung, Masataka Ohtani, Vinh Cao Tran, Thang Bach Phan
Abstract: This study changed the material thickness (0.5–2.7 μm) to control the orientation of microstructure for tailoring the thermopower factor of CuCr0.85Mg0.15O2 films. As a result, the (110)-preferred orientation and copper vacancies were dominant in the thicker film, which increased conductivity σ. The Seebeck coefficient S remained unchanged within the wide film thickness range despite the remarkable increment in σ. Therefore, the thermopower factor (PF = S2σ) of the CuCr0.85Mg0.15O2 films drastically increased with the increase in the film's thickness, reaching 720 μW/mK2 at 500 °C in a 2.0 μm-thick CuCr0.85Mg0.15O2 film. This value is better than that observed in the bulk materials. A detailed discussion of physical mechanisms is presented in this manuscript.
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(168) Chemical Communications, 58, 5257-5260, (Q1, IF = 6.222)
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Efficient Ammonia Synthesis via electroreduction of nitrite using single-atom Ru-doped Cu nanowire arrays
Ngoc Quang Tran, Le Thai Duy, Dai Cao Truong, Bao Thu Nguyen Le, Bach Thang Phan, Yunhee Cho, Hyoyoung Lee
Abstract: Here, we report the highly active and selective electrocatalytic reduction of NO2− ions to value-added NH3 over a single-atom Ru-modified Cu nanowire array on three-dimensional copper foam (Ru–Cu NW/CF) under ambient conditions. The obtained Ru–Cu NW/CF catalyst exhibited a maximum faradaic efficiency of 94.1% and an NH3 yield up to 211.73 mg h−1 cm−2 (0.732 mmol h−1 cm−2), which was approximately five times higher than that of the Cu NW/CF catalyst.
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(167) Environmental research, 206, 112631, (Q1, IF = 8.431)
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Green synthesis of microalgae-based carbon dots for decoration of TiO2 nanoparticles in enhancement of organic dye photodegradation
Truong Thi Vu Nu, Nhu Hoa Thi Tran, Phuoc Loc Truong, Bach Thang Phan, Minh Tuan Nguyen Dinh, Van-Phuc Dinh, Thanh Son Phan, Seongmoon Go, Mincheol Chang, Kieu The Loan Trinh, Vinh Van Tran
Abstract: TiO2 is a well-known semiconductor used widely in the photocatalyst field, but its photocatalytic applications are hampered by a fast electron–hole recombination rate and low visible light absorption due to a wide-band-gap energy. Herein, we present a simple, low cost, and green approach to obtain carbon dots from microalgae, namely microalgae-based carbon dots (MCDs), using an unprecedented microwave-assisted treatment. The MCDs were successfully decorated on the surface of TiO2 nanoparticles. The as-prepared composite exhibited a superior photodegradation of methylene blue, compared with pristine TiO2 (83% and 27%, respectively) under visible light irradiation. The MCDs in TiO2-MCDs serve as electron reservoirs to trap photoinduced electrons and as photosensitizers for the improvement of visible light absorption; both factors play an important role in the improvement of the TiO2 photocatalytic activity. Furthermore, the as-prepared composite photocatalyst also exhibits high photostability and recyclability during the photodegradation of methylene blue. Therefore, this work provides an original approach to the development of environmentally friendly and highly effective photocatalysts for the treatment of various organic pollutants, which can go a long way toward ensuring a safe and sustainable environment.
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