Zhang Xinyi, Li Dan, Bourgeois Laure, Wang Huanting, Webley Paul A
Department of Chemical Engineering, Monash University, Clayton, VIC, Australia.
Chemphyschem. 2009 Feb 2;10(2):436-41. doi: 10.1002/cphc.200800538.
Nanochannel alumina templates are used as templates for fabrication of porous gold nanowire arrays by a direct electrodeposition method. After modification with glucose oxidase, a porous gold nanowire-array electrode is shown to be an excellent electrochemical biosensor for the detection of glucose. The picture shows an SEM image of a nanowire array after removal of the alumina template by acid dissolution. We report the fabrication of porous gold nanowire arrays by means of a one-step electrodeposition method utilizing nanochannel alumina templates. The microstructure of gold nanowires depends strongly on the current density. The formation of porous gold nanowires is attributed to disperse crystallization under conditions of low nucleation rate. Interfacial electron transport through the porous gold nanowires is studied by electrochemical impedance spectroscopy. Cyclic voltammetric studies on the porous gold nanowire arrays reveal a low-potential electrocatalytic response towards hydrogen peroxide. The properties of the glucose oxidase modified porous gold nanowire array electrode are elucidated and compared with those of nonporous enzyme electrodes. The glucose oxidase modified porous gold nanowire-array electrode is shown to be an excellent electrochemical biosensor for the detection of glucose.
纳米通道氧化铝模板被用作通过直接电沉积法制备多孔金纳米线阵列的模板。在用葡萄糖氧化酶修饰后，多孔金纳米线阵列电极被证明是用于检测葡萄糖的优异电化学生物传感器。图中展示了通过酸溶解去除氧化铝模板后的纳米线阵列的扫描电子显微镜图像。我们报道了利用纳米通道氧化铝模板通过一步电沉积法制备多孔金纳米线阵列。金纳米线的微观结构强烈依赖于电流密度。多孔金纳米线的形成归因于在低成核速率条件下的分散结晶。通过电化学阻抗谱研究了通过多孔金纳米线的界面电子传输。对多孔金纳米线阵列的循环伏安研究揭示了对过氧化氢的低电位电催化响应。阐明了葡萄糖氧化酶修饰的多孔金纳米线阵列电极的性质，并与无孔酶电极的性质进行了比较。葡萄糖氧化酶修饰的多孔金纳米线阵列电极被证明是用于检测葡萄糖的优异电化学生物传感器。
