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[IEEE 2018 IEEE International Conference on Semiconductor Electronics (ICSE) - Kuala Lumpur (2018.8.15-2018.8.17)] 2018 IEEE International Conference on Semiconductor Electronics (ICSE) - Engineering the Properties of Nb<inf>2</inf>O<inf>5</inf>-ZnO Nanostructures via Dual Synthesis Techniques
摘要： In this paper, dual techniques; anodization and hydrothermal, were introduced to synthesize the Nb2O5-ZnO nanostructures. The purpose of this research is to engineer the properties of the Nb2O5-ZnO nanostructures which can offer new optical and electrical behaviors and also lead to large surface area. Synthesis of Nb2O5 has been conducted by anodizing the Niobium foil in the electrolyte containing NH4F and ethylene glycol. Meanwhile, ZnO was hydrothermalized with Zinc Nitrate precursor solution for 18 hr at different temperatures. All samples were characterized using FESEM, XRD and UV-Vis absorbance spectra. The morphological and properties changes of the Nb2O5-ZnO nanostructures are systematically investigated as a function of hydrothermal temperature.
关键词： ZnO,dual synthesis,anodization,Nb2O5,nanostructure,hydrothermal
更新于2025-09-23 15:21:21
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Circumferential growth of zinc oxide nanostructure anchored over carbon fabric and its photocatalytic performance towards p-nitrophenol
摘要： In present study, zinc oxide (ZnO) nanostructure anchored on carbon fabric (CF) was prepared using a combinational techniques of RF magnetron sputtering and hydrothermal method. The sputter seeded CF aided for the circumferential growth of ZnO nanostructure and its structural and optical characterization evidencing the c-axis orientation with the band gap of, 3.21 eV. ZnO nanostructure anchored CF was subjected towards UV light photocatalytic activity of p-nitrophenol for 150 min and remarkably higher activity of 98% was observed with better retrieval and recyclability upto 5 cycles. Because of these conspicuous features, it can serve as an expedient hybrid platform for photocatalytic application, better than the benchmark acid treated ZnO/CF.
关键词： Carbon fabric,Photocatalytic activity,Nanostructure,Hydrothermal,Sputtering
更新于2025-09-23 15:21:21
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Si, N-codoped carbon dots: preparation and application in iron overload diagnosis
摘要： Heteroatom doping is a straightforward and smart strategy to improve the fluorescence efficiency of carbon dots (CDs). We synthesized the Si, N-codoped CDs (SiNCDs) with high quantum yield up to 29.7% through one-step hydrothermal method. The linear range for Fe3+ was between 0 and 200 μM, and the limit of detection was about 5 μM, which presented potential for Fe quantification in serum to diagnose Fe overload. In addition, the SiNCDs demonstrated good selectivity to Fe3+ among high concentrations of metal ions, amino acids and H2O2, so there is no need to mix additional reagents as the colorimetric method does in clinic, making SiNCDs more competitive in clinical application. Furthermore, we explored the practicability of SiNCDs by detecting Fe in serum from five healthy volunteers and three patients suffering Fe overload. The recovery rate was from 87.1 to 113.6%, which confirmed the application prospect of SiNCDs in clinical diagnostics.
关键词： N-codoped carbon dots,hydrothermal method,Si,iron overload diagnosis,fluorescence efficiency,quantum yield
更新于2025-09-23 15:21:21
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Effects of Nd, Al Doping on the Structure and Properties of BiFeO3
摘要： The BiFeO3(BFO) and Bi0.95Nd0.05Fe1-xAlxO3 (x = 0, 0.03, 0.05, 0.075, 0.1) powders were prepared at 200 °C for 24 h by hydrothermal method. The effects of Al doping content on the structure, morphology, magnetic, and photocatalytic properties were studied. X-ray diffraction (XRD) and Fourier transform infrared spectrometer (FTIR) demonstrated the compounds are distorted rhombohedral perovskite structure without any other heterogeneity and structural transition. Field emission scanning electron microscope (FESEM) reflected surface of compounds is a dense, agglomerated sphere. As the concentration of Al3+ increases, a small part of the spherical crystallites eventually becomes cauliflower shape. Energy-dispersive X-ray (EDS) showed the Bi0.95Nd0.05Fe0.95Al0.05O3 sample mainly consists of five elements (Bi, Fe, O, Nd, Al) and atom radio matched well with the formula. Vibrating sample magnetometer (VSM) integrated in a physical property measurement system (PPMS-9) illustrated introducing Nd3+ ions into BFO will enhance its magnetism at room temperature. However, with the increase of non-magnetic ion Al3+ concentration in Bi0.95Nd0.05Fe1-xAlxO3 (x = 0, 0.03, 0.05, 0.075, 0.1), the network structure of Fe-O-Fe was destroyed, which led to the decrease of its net magnetization, so that the hysteresis loop shows paramagnetism. The photocatalytic performance of BFO increased initially and decreased afterwards as Al3+ concentration increased, and the best catalytic performance was achieved at x = 0.05.
关键词： Hydrothermal method,Magnetism,Nd, Al doping,BiFeO3
更新于2025-09-23 15:21:21
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The effect of hydrothermal conditions on photoluminescence properties of rice husk-derived silica-carbon quantum dots for methylene blue degradation
摘要： Carbon quantum dots (CQDs) have potential to replace metal-based quantum dots due to its low-toxicity. However, studies on CQDs preparation were dominated by synthetic carbon precursors. Switching the precursors into natural ingredient is preferred since they are highly abundant and low-cost. In this study, composite of silica-carbon quantum dots (Si-CQDs) were fabricated from rice husk through a hydrothermal process. Si-CQDs with diverse properties are beneficial for its application in the future; therefore, the variation of hydrothermal conditions (i.e., temperature and pH) was performed to investigate their influence on its properties. Investigation using HRTEM, XPS, Raman spectroscopy, and UV-Vis spectroscopy suggested that hydrothermal conditions affect carbonization reaction. Hydrothermal temperature controls carbonization rate of rice husk ash, while acid addition accelerates polymerization and base addition tends to cut more carbons into small particles. The photoluminescence (PL) analysis showed that the obtained Si-CQD samples have emission in the range of 469–552 nm with various intensities. The application of sole Si-CQDs was evaluated in methylene blue (MB) degradation under visible light irradiation.
关键词： Hydrothermal,Carbon quantum dots,Photocatalyst,Photoluminescence,Rice husk
更新于2025-09-23 15:21:01
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Photocatalytic degradation and adsorption of phenol by solvent-controlled TiO2 nanosheets assisted with H2O2 and FeCl3: Kinetic, isotherm and thermodynamic analysis
摘要： Hydrofluoric acid (HF) has been widely employed to regulate the surface characteristics of TiO2 containing sheet-like morphology with (001) facets for various environmental applications. However, carcinogenic effects associated with HF are the main stumbling blocks on its way towards global commercialization. In the same line of action, an eco-friendly approach for the synthesis of anatase TiO2 nanosheets (TNSs) via employing hydrothermal process and N, N dimethylformamide (DMF) as a novel morphology-controlling agent has been reported. The as-produced TNSs were characterized by XRD, HRTEM, Raman, FTIR, XPS and DRS characterizations. The photoactivity of as-produced TNSs was studied for photocatalytic degradation of phenol under visible light irradiation in the presence of green oxidants such as hydrogen peroxide (H2O2) and ferric chloride (FeCl3) to produce free hydroxyl radicals for speedily reduction of recombination of photogenerated electrons hole-pairs. The results revealed that as-produced TNSs could activate by green oxidants with yielding upto 94.19 and 97.12 % phenol degradation in the presence of H2O2 and FeCl3, respectively. Moreover, phenol adsorption data was well explained via pseudo first order and pseudo second order kinetics while Langmuir and Freundlich isotherms were more suitable to explain the adsorption of phenol onto TNSs, providing maximum adsorption capacity up to 23.596 mg/g. Various thermodynamic parameters were evaluated, suggesting the favourable, spontaneous and endothermic adsorption process. The values of activation energy (18.505 kJ/mol) confirmed the physical adsorption of phenol onto TNSs. The excellent aptitude of anatase TNSs to produce hydroxyl radicals and super-oxides radicals with promptly lessening of recombination of photogenerated electron hole-pairs makes them motivated applicant for wastewater treatment.
关键词： N, N dimethylformamide,green oxidants,adsorption mechanism,Hydrothermal process,TiO2 nanosheets,phenol
更新于2025-09-23 15:21:01
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A Novel Nanorod Self-Assembled WO <sub/>3</sub> ?· H <sub/>2</sub> O Spherical Structure: Preparation and Flexible Gas Sensor
摘要： In this work, a novel WO3·H2O spherical structure which was self-assembled by nanorods was achieved by using hydrothermal method. A comprehensive growth mechanism was proposed to explain the formation of three different type nanostructures. Flexible gas sensors were successfully fabricated based on such unique nanostructures. We found that these nanorods and nanoparticle’s self-assembled spherical structure showed excellent gas response to ammonia. This result may provide great benefit potential to further study for the preparation and gas performance of such self-assembled structure of WO3·H2O.
关键词： WO3·H2O,Nanostructures,Self-Assembly,Hydrothermal Process,Gas-Sensing
更新于2025-09-23 15:21:01
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Lignin-controlled photocatalyst of porous BiVO4-C nanocomposite for enhancing photocatalytic activity toward pollutant under visible-light
摘要： Explorations of biomass materials have emerged as a novel strategy to control the synthesis of semiconductor and improve the photocatalytic performance. Here, a lignin-derived porous structure of BiVO4-C nanocomposite was prepared via one-step hydrothermal approach. In the preparation process, lignin not only effectively controlled the growth of BiVO4 but also carbonized to form a porous structure of biochar-based semiconductor photocatalyst. The studies demonstrated that the BiVO4-C nanocomposite have enhanced photocatalytic activity due to the departure of electron-hole pairs and charge migration. These insights provided useful insight for the design of efficient biomass-based photocatalyst for environmental protection and green energy.
关键词： One-step hydrothermal,Biomass,Photocatalytic,BiVO4,Porous
更新于2025-09-23 15:21:01
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Shape and orientation controlled hydrothermal synthesis of silicide and metal dichalcogenide on a silicon substrate
摘要： Shape-controlled MoS2 has been grown directly on a silicon substrate, for the first time, using a facile hydrothermal synthesis approach. The growth morphology is dependent on the substrate orientation. Square, hexagonal and triangular patterns of MoS2 are grown on Si (100), Si (110) and Si (111), respectively. Detailed studies reveal that Mo silicide is formed at the initial stage, and the formation of silicide patterns is dictated by the different surface energies of Si (100), Si (110) and Si (111). Subsequently, shaped MoS2 patterns are formed following the silicide ones at the thermodynamic equilibrium. The approach for the formation of these patterns can be generalized to other 2D materials and can also be formed in a large scale by a lithography method. The work has shown a new technique to form silicide via solution processing and grow patterned 2D materials directly on silicon substrates, which may have the potential for advancing the next-generation electronic devices.
关键词： Metal dichalcogenide,Silicide,Hydrothermal,Pattern
更新于2025-09-23 15:21:01
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One-pot Hydrothermal Synthesis of ZnO Microspheres/Graphene Hybrid and its Electrochemical Performance
摘要： In this paper, the ZnO microspheres/graphene hybrids were successfully prepared from zinc acetate and GO aqueous solution by a facile one-pot hydrothermal method without any surfactant. The as-synthesized samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), thermogravimetric (TGA) analysis, nitrogen adsorption/desorption isotherms and pore size distribution. When evaluated as anode material for lithium ion batteries, it delivered a high initial discharge capacity of 1150 mAh g-1 and exhibited excellent rate performance at different current densities.
关键词： anode materials,ZnO microspheres/graphene hybrid,one-pot hydrothermal,lithium ion batteries
更新于2025-09-23 15:21:01