Shape-Controlled Gold Nanoarchitectures: Synthesis, Superhydrophobicity, and Electrocatalytic Properties
Shape-Controlled Gold Nanoarchitectures: Synthesis, Superhydrophobicity, and Electrocatalytic Properties
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DOI：
10.1021/jp802012h
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发表时间：
2008-08
影响因子：
3.7
通讯作者：
Hui Zhang;Jing-Juan Xu;Hongyuan Chen
中科院分区：
文献类型：
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作者：
Hui Zhang;Jing-Juan Xu;Hongyuan Chen
一个简单的一步电沉积方法被用来制造各种金纳米结构的玻碳电极在低浓度的HAuCl 4溶液（5 mM）。最终的金纳米结构的形态可以很容易地通过改变前体的pH值或沉积温度来控制。采用X射线粉末衍射、扫描电子显微镜、透射电子显微镜、接触角测量和电化学方法对其进行了表征。在pH为4的溶液中得到了具有高活性表面积的分级杨梅状金纳米结构，其对氧的还原反应具有比其他纳米金更高的催化性能。这些金结构也显示出非凡的超疏水性，接触角随着沉积温度和时间的增加而增加。研究了它们对葡萄糖氧化的电催化性能。无酶传感器可方便地用于葡萄糖浓度的检测。
A simple one-step electrodeposition method was used to fabricate various gold nanostructures on glassy carbon electrodes in a low concentration of HAuCl4 solution (5 mM). The morphologies of final gold nanostructures can be easily controlled by varying the pH of the precursors or the deposition temperature. X-ray powder diffraction, scanning electronic microscopy, transmission electron microscopy, contact angle measurements, and electrochemical methods were used to characterize them. Hierarchical waxberry-like gold nanostructures with high active surface areas were obtained in pH 4 bath, and they had a higher catalytic performance for the reduction of oxygen than the other nanogold. These gold structures also displayed an extraordinary superhydrophobicity and the contact angle increased with the increase of deposition temperature and time. Their electrocatalytic response to the oxidation of glucose was also investigated. A sensitive enzyme-free sensor can be easily developed for the detection of glucose i...