Abstract
A novel low-temperature, solution-phase method for the facile fabrication of a variety ofone-dimensional (1D) metal/metal oxide hybrid nanostructures has been developed. Thismethod is based on the wet chemical synthesis of metal oxide nanowires, followed by thesurface coating of metal nanoparticles on metal oxide nanowire templates via reduction ofmetal ions along with controlled etching of metal oxide nanowires at the core, all in alow-temperature liquid environment. As a proof-of-concept, we applied this method to thefabrication of various 1D Pt/ZnO hybrid nanostructures including Pt nanoparticle-coatedZnO nanowires/nanotubes and Pt nanotubes on silicon and polymer substrates. Thediverse morphology tuning is attributed to the control of pH in the solution with differentmetal precursor concentrations and amounts of reducing agent. The change ofmorphology, crystalline structure, and composition of various 1D Pt/ZnO hybridnanostructures was observed by SEM, TEM (HRTEM), XRD and ICP-AES,respectively. Further, we have demonstrated a highly sensitive strain sensor (gauge factor = 15) with a Pt nanotube film fabricated by the developed method on a flexible polymersubstrate.
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