Department of Mechanical Engineering, The University of Hong Kong, Pokfulam, Hong Kong.
Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong.
Sci Rep. 2017 Jan 3;7:39839. doi: 10.1038/srep39839.
A promising alternative route for the synthesis of three-dimensional Au dendrites was developed by direct electrodeposition from a solution of HAuCl containing 3-aminopropyltriethoxysilane (APTS). Ultraviolet-visible spectroscopy, fourier transform infrared spectroscopy and isothermal titration calorimetry were used to study the interaction of APTS in electrolyte. The effect of APTS on the formation of the hierarchical structure of Au dendrites was investigated by cyclic voltammetry, rotating disk electrode, electrochemical impedance spectroscopy and quartz crystal microbalance. The growth directions of the trunks and branches of the Au dendrites can be controlled by sweep-potential electrodeposition to obtain more regular structures. The efficacy of as-synthesised Au dendrites was demonstrated in the enhanced electro-catalytic activity to methanol electro-oxidation and the high sensitivity of glucose detection, which have potential applications in direct-methanol fuel cells and non-enzymatic electrochemical glucose biosensors, respectively.
一种通过直接在含有 3-氨丙基三乙氧基硅烷 (APTS) 的 HAuCl 溶液中电沉积来合成三维 Au 树枝状结构的有前途的替代方法被开发出来。采用紫外-可见光谱、傅里叶变换红外光谱和等温热滴定法研究了 APTS 在电解液中的相互作用。通过循环伏安法、旋转圆盘电极、电化学阻抗谱和石英晶体微天平研究了 APTS 对 Au 树枝晶分级结构形成的影响。通过扫速电沉积可以控制主干和分支的生长方向，从而获得更规则的结构。所合成的 Au 树枝晶在增强甲醇电氧化的电催化活性和葡萄糖检测的高灵敏度方面表现出良好的效果，分别在直接甲醇燃料电池和非酶电化学葡萄糖生物传感器中有潜在的应用。
