tailieunhanh - Báo cáo hóa học: " Parametric Study on Dimensional Control of ZnO Nanowalls and Nanowires by Electrochemical Deposition"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Parametric Study on Dimensional Control of ZnO Nanowalls and Nanowires by Electrochemical Deposition | Nanoscale Res Lett 2010 5 1727-1736 DOI s11671-010-9702-2 NANO EXPRESS Parametric Study on Dimensional Control of ZnO Nanowalls and Nanowires by Electrochemical Deposition Debabrata Pradhan Shrey Sindhwani K. T. Leung Received 30 May 2010 Accepted 13 July 2010 Published online 28 July 2010 The Author s 2010. This article is published with open access at Abstract A simple electrochemical deposition technique is used to synthesize both two-dimensional nanowall and one-dimensional nanowire ZnO nanostructures on indium-tin-oxide-coated glass substrates at 70 C. By finetuning the deposition conditions particularly the initial Zn NO3 2-6H2O electrolyte concentration the mean ledge thickness of the nanowalls 50-100 nm and the average diameter of the nanowires 50-120 nm can be easily varied. The KCl supporting electrolyte used in the electrodeposition also has a pronounced effect on the formation of the nanowalls due to the adsorption of Cl- ions on the preferred 0001 growth plane of ZnO and thereby redirecting growth on the 1010 and 2ĨĨ0 planes. Furthermore evolution from the formation of ZnO nanowalls to formation of nanowires is observed as the KCl concentration is reduced in the electrolyte. The crystalline properties and growth directions of the as-synthesized ZnO nanostructures are studied in details by glancing-incidence X-ray diffraction and transmission electron microscopy. Keyword ZnO nanostructures Dimensional control Electrodeposition Electron microscopy Introduction ZnO-nanostructured films are one of the promising wideband-gap eV semiconducting materials with a wide range of potential applications including UV lasers light emitting diodes nanogenerators transistors sensors D. Pradhan S. Sindhwani K. T. Leung WATLab and Department of Chemistry University of Waterloo Waterloo ON n2l 3G1 Canada e-mail tong@ catalysts electron emitters and solar cells 1 2 . The efficiency and performance of any optical and electrical .