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Showing 1 to 20 of 372 for “"ZnO"”.
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Luminescence in ZnO
… with a large binding energy (about 60meV), ZnO is a promising candidate semiconductor material for the next generation of optoelectronic , light emission or high power and high frequency devices. In order to make electrical device from ZnO, it is necessary to investigate optical properties …
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Effect of calcination temperature on bilayer TiO2/ZnO and ZnO/TiO2 thin films
… from titanium dioxide (TiO2) and zinc oxide (ZnO) have good photocatalytic properties, high refractive index, a high dielectric constant, and good thermal stability. In this study, bilayer TiO2/ZnO and ZnO/TiO2 thin films were produced using sol-gel synthesis with titanium (IV) butoxide as the …
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Raman Scattering in GaN and ZnO
… technique has been used for the study of GaN and ZnO. Capabilities of the Raman technique and existing literature on Raman spectroscopy in GaN and ZnO are reviewed. About 50 GaN and ZnO samples with a wide range of properties are studied. From the analysis of positions of the E2H and A1(LO) phonon …
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DLC Thin Film Assisted ZnO Nanowires Growth
… fabricated dense, uniform, vertically aligned ZnO NWs on top of DLC films. The NWs' length, diameter and separation distance were controllable by fine tuning the growth parameters and changing the DLC film deposition temperature. HRTEM examination confirms the NWs were single crystalline with …
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Characterization of nanostructures ZnO synthesized through hydrothermal method
ZnO nanostructures can be derived using a variety of techniques. Using hydrothermal synthesis, ZnO nanostructures can be produced easily on a large scale due to the low temperature involved. Among the factors that influence the crystallinity of ZnO nanostructures are types of alkaline solution, the …
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Low Temperature Growth and Characterization of ZnO Nanostructures
… The two contacts proposed are Zinc Oxide (ZnO) nanowires and Bismuth Telluride (BiTe) nanowires, and the organic light absorber is a semiconductor porphyrin. To further develop and design this device, the two contact materials need to be characterized and further developed. This manuscript …
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Development of ZnO Nanotube Arrays for Chemical Sensing
… the development of a new material, anodic ZnO nanotube array, as the sensing platform and the application of artificial intelligence to a sensor system developed using this material. The nanotube array geometry showed specific light scattering properties, as revealed by the finite …
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Growth and characterization of ZnO and related nanostructures
Zinc oxide (ZnO) nanostructures exhibit unique optical properties which makes them potential candidates for optoelectronic device applications. It is very important for various applications to be able to control morphology of low dimensionality nanostructures. In the first part of this thesis, …
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Toxicity of manufactured nano-ZnO to Lemna minor
… production and commercial use of engineered nano-ZnO. Engineered/manufactured nano-ZnO are applied in a broad range of products such as drugs, paints, cosmetics, abrasive agents and insulators. This can result in the unintended exposure of human beings to nano-ZnO and will inevitably result in the …
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First principles calculations on ZnO non-equilibrium phase
… for the non-equilibrium boron-nitride phase of ZnO have been studied. To understand the difference between the BN phase and the equilibrium WZ phase, first principles approaches such as DFT, hybrid functional and the GW approximation have been studied and applied. The lattice constant has been …
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Sub-micron Patterning of ZnO-PMMA Hybrid Films
… creating a liquid suspension of functionalized ZnO nanoparticles and poly(methyl methacrylate) (PMMA) in a solvent. The ZnO particles were functionalized by adding nonanoic acid in order to facilitate the dispersion of the particles in a non-polar solvent. This suspension was spread onto …
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Efeito da concentração de nanopartículas de ZnO (ZnO-NP) na atividade antibacteriana e nas propriedades físicas e químicas de compósitos experimentais
… a adição de nanopartículas de óxido de zinco - ZnO-NP (40-100 nm) nas seguintes concentrações: E1= 0%, E2= 0,5%, E3= 1%, E4= 2%, E5= 5% e E6= 10%. A análise do potencial antibacteriano foi avaliada através da atividade metabólica pela redução do MTT [3– (4, 5- dimetiltiazol- 2- yl)- 2, 5- …
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Formation Mechanisms and Photocatalytic Properties of ZnO-Based Nanomaterials
Zinc Oxide (ZnO) is one of the most extensively studied semiconductors because of its unique properties, namely, its wide band gap (3.37 eV) and high excitation binding energy (60 meV). These properties make ZnO a promising material for uses in a broad range of applications including sensors, …
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Preparation and Characterization of Cu-ZnO Catalysts for Methanol Synthesis
… aus Synthesegas (H2, CO und CO2) mit Cu/ZnO/Al2O3 Katalysatoren bei Temperaturen von 250-350 C und Drücken bis zu 100 bar hergestellt. Es ist bekannt, dass für eine größtmögliche Aktivität Cu möglichst fein dispergiert sein sollte (hohe Cu Oberfläche). ZnO dient dabei nicht nur als …
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Enhancement of the UV emission in metal nanoparticle-coated ZnO
… increases in ultra-violet (UV) luminescence in ZnO have been reported, due to the presence of a surface coating of either Au or Al nanoparticles. Two significantly different models have been proposed to explain the observed increase in the UV light output. One involving the decay of metal …
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Fabrication and Characterization of ZnO/CuO Core-Shell Nanowire Arrays
… various functional materials, zinc oxide (ZnO), with a direct electron energy band gap of 3.34 eV at room temperature, is an important optoelectronic material with an intrinsically <em>n-type</em> semiconducting property. However, to form a <em>p-type</em> ZnO semiconductor is still a …
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Field emission of ZnO nano-structures produced by laser ablation
… of flight mass spectrometry, for deposition of ZnO materials for applications as field electron emission sources. The results from the work are concerned with the study of the important physical processes present in a laser ablation zinc oxide plasma plume expanding into vacuum and various …
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