Synthesis and Characterization of ZnO Nanowire–CdO Composite Nanostructures

ZnO nanowire–CdO composite nanostructures were fabricated by a simple two-step process involving ammonia solution method and thermal evaporation. First, ZnO nanowires (NWs) were grown on Si substrate by aqueous ammonia solution method and then CdO was deposited on these ZnO NWs by thermal evaporation of cadmium chloride powder. The surface morphology and structure of the synthesized composite structures were analyzed by scanning electron microscopy, X-ray diffraction and transmission electron microscopy. The optical absorbance spectrum showed that ZnO NW–CdO composites can absorb light up to 550 nm. The photoluminescence spectrum of the composite structure does not show any CdO-related emission peak and also there was no band gap modification of ZnO due to CdO. The photocurrent measurements showed that ZnO NW–CdO composite structures have better photocurrent when compared with the bare ZnO NWs

ZrO2-COATED SiC NANOWIRES PREPARED BY PLASMA-ENHANCED ATOMIC LAYER CHEMICAL VAPOR DEPOSITION

Plasma-enhanced atomic layer deposition (PE-ALCVD) of ZrO2 was performed to coat SiC nanowires and prepare a SiC-ZrO2 core-shell nanowire structure. Zirconium tertiary butoxide (ZTB) and hydrogen plasma pulse cycles were used to grow ZrO2 films. The growth temperature of ZrO2 PE-ALCVD was 150°C with a growth rate of 1.3 Å/cycle. SEM and TEM images showed uniform coating of SiC nanowires with ZrO2. The thickness of ZrO2 coat layer could be controlled by the total number of the pulse cycles. After being annealed at 900°C, a polycrystalline structure of ZrO2 layer was observed.Nanowires, core-shell nanowire, SiC, ZrO2, plasma-enhanced ALCVD

Characterization of ZnO nanorod arrays fabricated on Si wafers using a low-temperature synthesis method

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LOW-TEMPERATURE SYNTHESIZED ZnO NANONEEDLES: XPS AND PL ANALYSIS

Evolution of morphology change was investigated for ZnO nanoneedle array grown by low-temperature MOCVD. Well-aligned ZnO nanoneedle array was deposited on the ZnO buffer-film/Si substrate at temperatures below 500°C. A rod-shaped ZnO nanowire in the initial growth stage changed into needle-shaped as the deposition proceeds. ZnO nanoneedle array deposited on the annealed buffer-film showed better alignment compared to that deposited on the as-grown film. XPS analysis showed that Zn 2p peak has a single binding energy state of a stoichiometric Zn–O bond while O 1 s peak has three different chemical binding states. Highly crystalline ZnO nanoneedle array showed a strong bandedge emission at 380 nm in photoluminescence measurements.ZnO nanoneedle, photoluminescence, MOCVD, XPS

Solution-Based Synthesis of a CdS Nanoparticle/ZnO Nanowire Heterostructure Array

CdS nanoparticle (NP)/ZnO nanowire (NW) heterostructure arrays were fabricated by a two-step chemical solution deposition method. First, vertically aligned ZnO nanowire arrays were grown on a substrate from Zn(NO(3))(2) (10 mM) and an aqueous ammonia (pH similar to 11) solution at 95 degrees C for 6 h. Then, CdS nanoparticles were deposited on the ZnO nanowire array in a chemical bath containing CdSO(4), thiourea, and an aqueous ammonia solution (molar ratio of 1:5:500) at 60 degrees C. The effects of deposition reaction conditions, such as solution concentrations and deposition time, were investigated. Synthesized US NP/ZnO NW heterostructures were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM), and their optical absorption property was measured by light absorbance spectrometry. As the solution concentrations and deposition time increased, the sizes and density of CdS nanoparticles on the surfaces of ZnO nanowires increased and the visible-light absorption capability was improved. The CdS NP/ZnO NW heterostructure arrays presented here offer promising applications in solar-energy converting devices. The photoelectrochemical cells using CdS NP/ZnO NW heterostructure arrays as photoelectrodes showed enhanced photocurrent characteristics compared with the photoelectrode cell of a bare ZnO nanowire arrayclose909

Novel heterostructure of CdS nanoparticle/WO3 nanowhisker: Synthesis and photocatalytic properties

A novel heterostructure of CdS nanoparticles/WO3 nanowhiskers was synthesized using a simple two-step process; thermal evaporation and chemical bath deposition. First, WO3 nanowhiskers (NWs) were grown on a tungsten substrate by thermal evaporation of WO3 powder in a tube furnace at 1050 degrees C. Sequentially, CdS nanoparticles (NPs) were deposited on WO3 nanowhiskers by chemical bath deposition. CdS nanoparticles modified WO3 nanowhiskers showed enhanced visible light absorption compared to bare WO3 nanowhiskers. The photocatalytic activity was studied by the photodegradation of methylene blue. CdS NP/WO3 NW heterostructures showed remarkably enhanced photodecomposition efficiencies compared to bare WO3 nanowhiskers