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Growth and Characterization of Indium Oxide, Zinc Oxide and Cadmium Sulfide Nanowires by Vapor-Liquid-Solid Growth Technique
摘要： In this study, the growth of three important semiconductor nanowires, Zinc Oxide, Indium Oxide and Cadmium Sulfide nanowires using the vapor–liquid–solid (VLS) method has been investigated. Different growth recipes with different growth parameters were incorporated to synthesize high quality and long NWs. It attempts to provide precise growth recipes which lead to high quality of nanowires. The effect of different growth conditions such as growth temperature, carrier gas flow, presence of metal catalyst and growth time has been investigated. Also, to evaluate the crystal quality of the nanowires, photoluminescence (PL) spectra of the as grown nanowires were investigated.
关键词： Cadmium sulfide (CdS),Zinc Oxide,Nanowires,Indium Oxide,vapor liquid solid (VLS) growth
更新于2025-09-09 09:28:46
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Studies on zinc oxide thin films by chemical spray pyrolysis technique
摘要： Zinc oxide (ZnO) thin films were deposited by chemical spray pyrolysis (CSP) technique using zinc acetate dihydrate solutions on microscopic glass substrates by varying the precursor concentration. The prepared films were characterized structurally and optically, using the powder X-ray diffraction (XRD) and UV analysis and Photoluminescence analysis. Crystallographic properties were analyzed through powder XRD. The XRD patterns shows a hexagonal structure with c-axis orientation (0 0 2) on self texturing phenomenon. Optical transmittance properties of the optimized ZnO thin films were investigated by using UV-Vis spectroscopy. The optical studies predicated a maximum transmittance in the range of above 70% with direct band gap values in the range of 2.9 to 3.2eV for the zinc oxide thin films. Under excitation of 300 nm radiations, sharp deep level emission peak at 2.506 eV dominates the photoluminescence spectra with weak deep level and near band edge emission peak at 3.026 and 3.427 eV respectively.
关键词： Photoluminescence,Transparent conducting oxide (TCO),UV-Vis,Zinc Oxide thin film,CSP technique,X-ray diffraction (XRD)
更新于2025-09-09 09:28:46
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A review of inorganic UV filters zinc oxide (ZnO) and titanium dioxide (TiO <sub/>2</sub> )
摘要： Photoprotection has become integral in the prevention of keratinocyte cancer and photoaging. Organic UV filters such as oxybenzone and octinoxate have become controversial due to their potential impact on the environmental and their potential human health risks. As such, inorganic UV filters, ZnO and TiO2, have become paramount in discussions about photoprotection. ZnO and TiO2 are used in sunscreens as nanoparticles, which denotes a size less than 100nm. The smaller size of these mineral particles increases their cosmetic acceptability by users as they are much less visible after application. ZnO has a broad UVA-UVB absorption curve, while TiO2 provides better UVB protection. Overall, the human health risks with inorganic filters are extremely low given a lack of percutaneous absorption; however, there is potential risk when exposed via inhalation, prompting recommendations against spray sunscreen products with nanoparticles. At this time, the known risk to the environment is low though the risk stratification may evolve with increasing usage of these filters and higher environmental concentrations. The continued practice of photoprotection is critical. The public should be counseled to seek shade, use photoprotective clothing including hats and glasses in addition to sunscreens on sun-exposed skin. For those concerned about emerging evidence of environmental impact of organic UV filters, based on current evidence, ZnO and TiO2-containing sunscreens are safe alternatives.
关键词： environmental impact,titanium dioxide,photoprotection,inorganic UV filters,nanoparticles,zinc oxide,health risks,sunscreen
更新于2025-09-09 09:28:46
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Facile construction of a molybdenum disulphide/zinc oxide nanosheet hybrid for an advanced photocatalyst
摘要： Zinc oxide, an important semiconductor material with good stability, is widely used in photocatalytic degradation of organic pollutants. MoS2 is a two-dimensional semiconductor material. When molybdenum disulphide has more sulfur elements exposed, the photocatalytic activity can be improved. Through the hydrothermal method, zinc oxide nanosheets and molybdenum disulphide nanosheets were successfully supported to form MoS2-ZnO heterojunctions. The surface area of these heterojunctions is large, and they expose more sulfur elements which can effectively promote the separation of photo-generated electrons and holes, and improve the photocatalytic performance of MoS2-ZnO heterojunctions. The photocatalytic degradation of Rhodamine B by MoS2-ZnO heterojunctions was completed in one hour. MoS2-ZnO heterojunctions are environmentally friendly photocatalysts that do not pollute the environment when they degrade organic pollutants in water.
关键词： Photocatalyst,Zinc oxide,Molybdenum disulphide,Heterojunction
更新于2025-09-09 09:28:46
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Decoupling the contributions to the enhancement of electrical conductivity in transparent silver nanowire/zinc oxide composite electrodes
摘要： Electrical properties of silver nanowire (AgNW)-based transparent electrodes have been improved without transmittance loss by forming a composite with zinc oxide (ZnO). Here, we identified the dominant effect responsible for the improvement of electrical conductivity of the transparent AgNW:ZnO composite electrodes by fabricating the AgNW:ZnO composite electrodes with different architectures and theoretically calculating the overall resistance of their equivalent circuits. Specifically, when we compared the overall resistances of the AgNW:ZnO electrodes with various architectures by experiment, the electrode with only the electrical bridge effect showed the lowest electrical resistance. In addition, while the theoretical overall resistances were comparable on changing the interconnect resistances between the silver nanowires in the equivalent circuits of all architectures, they decreased dramatically with the decreasing ZnO bridging resistance. Thus, it was concluded that the electrical bridge effect is more important than the capillary force effect which decreases the interconnect resistance between the silver nanowires for the enhancement of the electrical properties of AgNW:ZnO composite electrodes. It was also found that the AgNW:ZnO electrodes with only the electrical bridge effect showed better device performances when applied to optoelectronic devices such as organic photovoltaics.
关键词： electrical conductivity,silver nanowire,electrical bridge effect,zinc oxide,capillary force effect
更新于2025-09-09 09:28:46
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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) - Physical Modelling and Simulation of Au/ZnO Schottky diode
摘要： A Schottky diode of Gold (Au)/ ZnO is simulated using an open source TCAD device simulator (Minimos-NT) and the effect of different device models on the electrical characteristics of ZnO Schottky diode have been studied. The simulated electrical characterization experimental results reported in [1] and the reasons for discrepancy in the results have been addressed. For effective simulation, material parameters of ZnO collected from literature published in various research papers and magazine articles were supplied to the software. Hence, development of a complete database of ZnO parameters was also aimed which will assist in future simulations of the said material.
关键词： Simulation,Schottky diode,Zinc Oxide,TCAD device simulator
更新于2025-09-09 09:28:46
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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) - Facile Synthesis of N-doped ZnO Nanorod Arrays: Towards Enhancing the UV-sensing Performance
摘要： Nitrogen (N) doped zinc oxide (ZnO) nanorod arrays at different doping concentrations from 0 at.% (undoped) to 2 at.% have been prepared using sol-gel immerse method. FESEM images revealed that the average diameter increased when the concentration of N in ZnO increased. The I-V measurement displayed that 1 at.% sample possessed the lowest resistance film and exhibit the highest UV sensing performance with sensitivity of 12.9.
关键词： nanorod,Nitrogen,immersion,zinc oxide
更新于2025-09-09 09:28:46
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UV Luminescence and Lasing in Ensembles of Zinc-Oxide Microcrystals with Copper
摘要： Microrod arrays of zinc oxide with copper have been grown by chemical vapor deposition on single-crystal sapphire substrates preliminarily covered with a nanoscale copper layer. The presence of copper (about 0.3%) in zinc-oxide microrods has been experimentally shown to increase the photoluminescence intensity of the ZnO microcrystal arrays, reduce the lasing threshold, and lead to a small (by ~2.5 nm) blue shift of the radiation intensity peak of the ZnO microcrystals. It is shown that the laser-radiation character depends on the morphology of the ZnO microrod arrays.
关键词： lasing,zinc-oxide microcrystals,UV luminescence,copper doping,chemical vapor deposition
更新于2025-09-09 09:28:46
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Thermal and Morphological Studies on Bismaleimide Modified ZnO Nanoparticles
摘要： The bismaleimide (N,N'-bismaleimide-4,4'-diphenylmethane) (BMI) modified siliconized zinc oxide nanoparticles were prepared in chloroform. The FT-IR spectroscopy analysis of BMI/ZnO reveals that -NH2 groups of siliconized ZnO reacts with the maleimide double bond of bismaleimide molecules through a nucleophilic (Michael) addition reaction. The thermal (TG) and morphological properties of bismaleimide modified zinc oxide nanoparticles (BMI/ZnO), were investigated. The particle size and morphology of zinc oxide nanoparticles and siliconized zinc oxide nanoparticles were determined by XRD. The SEM images indicate that the diameter of the zinc oxide nanoparticles is in the range of 25-40 nm with a strong aggregation process. It is observed that aggregates of bismaleimide modified siliconized zinc oxide nanocomposites of different size and shape are heterogeneously distributed in the elastomeric surface due to the low shear stress and processing time, which do not make an exfoliated material.
关键词： Bismaleimide modified zinc oxide nanoparticles,FT-IR,TG,SEM,XRD
更新于2025-09-09 09:28:46
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Tuning the optical properties of ZnO:Cd by doping La and Y
摘要： Zinc oxide doped with Cadmium and rare earth elements synthesized by solgel auto combustion route is reported in this work. The studies have been carried out to analyze the structural, morphological and optical properties of Cd doped ZnO and rare earth doped ZnCdO. The XRD analysis reveals that the addition of rare earth impurity decreases the particle size of ZnCdO. La doped ZnCdO has the least particle size among the samples of ZnCdO and rare earth doped ZnCdO. The morphological changes due to the addition of rare earth impurities have been found. Samples of La doped ZnCdO shows a pillar like morphology. The hexagonal structures are prominently seen in the SEM micrographs of the samples of ZnCdO. The UV-Visible spectral analyses show that the bandgap reduces when ZnCdO is doped with the rare earth impurities. The photoluminescence spectra show the broad spectrum in visible region exhibited by ZnO and a scanty UV emission. The UV emission of rare earth doped samples decreases due to the destruction in the crystal structure. The rare earth doped ZnCdO shows a small peak in green emission that decreases when rare earth impurities are doped. There is a uniform spectral response other than a small Gaussian like green peak. The overall analyses show that the samples can be used in optoelectronic applications to work in the visible region.
关键词： rare earth elements,structural properties,optical properties,UV-Visible spectral analyses,Cadmium,SEM micrographs,photoluminescence spectra,XRD analysis,Zinc oxide,solgel auto combustion,morphological properties
更新于2025-09-09 09:28:46