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Synthesis of Cu(OH)2 and CuO nanoribbon arrays on a copper surface.pdf

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Synthesis of Cu(OH)2 and CuO nanoribbon arrays on a copper surface

Synthesis of Cu(OH)2 and CuO Nanoribbon Arrays on a Copper Surface Xiaogang Wen, Weixin Zhang, and Shihe Yang* Department of Chemistry, Institute of Nano Science and Technology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong Received February 19, 2003. In Final Form: April 11, 2003 Cu(OH)2 and CuO nanoribbon arrays aligned approximately perpendicular to copper substrate surfaces are synthesized by the solution-treatment and subsequent heat-treatment processes. The Cu(OH)2 nanoribbons are fabricated by a simple coordination self-assembly method in an alkaline solution with Cu 2+ ions being from the surface oxidation of copper. The CuO nanoribbons are formed by removing water from the Cu(OH)2 nanoribbons through heat treatment. The nanoribbons are ～50-60 nm in average width and several nanometers in thickness, and the lengths can be well-controlled by varying the reaction temperature and time interval. Transmission electron microscopy, high-resolution TEM, scanning electron microscopy, electron diffraction, and X-ray diffraction techniques have been used to characterize the microstructures and morphologies of the nanoribbon materials. Introduction One-dimensional (1D) semiconductor and metal nano- materials are considered to be key structural components of electronic, magnetic, and photonic devices. Their unique properties could be harnessed for the design and fabrica- tion of nanosensors, 1,2 switches, 2 nanolasers, 3 and tran- sistors. 4 Many possible applications of 1D nanomaterials require the formation of well-aligned arrays to accentuate the anisotropy and satisfy the criterions of device design. The porous alumina-based template technique has been the workhorse for the fabrication of numerous metal and semiconductor nanowire arrays, including Co, 5,6 Sb, 7 FexAg1-x, 8 C70, 9 In2O3, 10 and CdS. 11,12 Other templates, such as nanoporous single-crystal mica, 13 “track-etch” poly- carbonate membranes, 14 and self-assembled c