Edge Plane Sites on Highly Ordered Pyrolytic Graphite as Templates for Making Palladium Nanowires via Electrochemical Decoration

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• 作者：Xiaobo Ji ; Craig E. Banks ; Wang Xi ; Shelley J. Wilkins ; Richard G. Compton
• 刊名：Journal of Physical Chemistry B
• 出版年：2006
• 出版时间：November 16, 2006
• 年：2006
• 卷：110
• 期：45
• 页码：22306 - 22309
• 全文大小：433K
• 年卷期：v.110,no.45(November 16, 2006)
• ISSN：1520-5207

文摘

An approach for the fabrication of metal nanowires is presented. Palladium wires with diameters less than 50nm were produced by electrochemical decoration of step edge sites on the surface of highly ordered pyrolyticgraphite via the following three steps. First an electrochemical activation step was used to oxidize the edgeplane sites on highly ordered pyrolytic graphite surfaces in 0.5 M Na₂SO₄. Second, a potential cycling stepin a 1 mM PdCl₂ solution in 0.1 M H₂SO₄ was used to form palladium oxide (s) and/or complexes of Pd onthe step edges. Third, Pd nanowires were formed by electroreduction after transfer of the graphite to 0.1 MH₂SO₄. The resulting wires showed a high degree of uniformity. A merit of this approach is that it allowedmetal nanowires to be fabricated without the simultaneous formation of nanoparticles on the basal planeterraces, in contrast to other studies of this type. The mesoscopic palladium wires are shown to be useful forthe electrochemical sensing of hydrazine.