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Optical Properties of Electrochemically Deposited ZnO Thin Films on Colloidal Crystal Film of SiO2 Microspheres

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The optical properties of electrochemically deposited ZnO thin films on colloidal crystal film of SiO2 microspheres structures were studied. Colloidal crystal film of SiO2 microspheres were self-assembled by evaporation using SiO2 in solution at a constant 0.1 wt%. ZnO in thin films was then electrochemically deposited on to colloidal crystal film of SiO2 microspheres. During electrochemical deposition, the content of Zn(NO3)2·6H2O in solution was 5 wt%, and the process's conditions were varied between of 2–4 V and 30–120 s at room temperature, with subsequent heat-treatment between 200 and 400 °C. A smooth surface and uniform thickness of 1.8 m were obtained at 3 V for 90 s. The highest PL peak intensity was obtained in the ZnO thin film heat-treated at 400 °C. The double layered ZnO/SiO2 colloidal crystals showed clearly better emission properties than the SiO2/ZnO and ZnO structures.
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Keywords: ELECTROCHEMICAL DEPOSITION; PHONIC CRYSTALS; PHOTOLUMINESCENCE; SELF-ASSEMBLY; SIO2 NANOPOWDER; TWO-STEP COATING; ZNO

Document Type: Research Article

Publication date: 2012-02-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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