We report the synthesis of hierarchically branched semiconducting nanowire on metallic Sb-doped nanowires by the sequential seeding of multiple nanowire generations with Au nanoparticles as catalysts. Such semiconducting nanowire/metallic backbone complex structures increase the potential functionality of nanowires. Branched nanowire films are used as sensing materials for high-performance ethanol sensor fabrication. The nanowire sensors show sub-ppm sensitivity and fast response and recovery times at . A linear equation relationship between sensitivity and the ethanol vapor concentration was observed.
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2008
American Institute of Physics
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