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首页> 外文期刊>Journal of Materials Engineering and Performance >Electrodeposition of Various Au Nanostructures on Aligned Carbon Nanotubes as Highly Sensitive Nanoelectrode Ensembles
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Electrodeposition of Various Au Nanostructures on Aligned Carbon Nanotubes as Highly Sensitive Nanoelectrode Ensembles

机译：排列的碳纳米管上的各种金纳米结构作为高灵敏度纳米电极组件的电沉积

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An efficient method has been developed to synthesize well-aligned multi-walled carbon nanotubes (MWCNTs) on a conductive Ta substrate by chemical vapor deposition. Free-standing MWCNTs arrays were functionalized through electrochemical oxidation with the formation of hydroxyl and carboxyl functional groups. Facile template-free electrochemical routes were then developed for the shape-selective synthesis of less-common Au nanostructures, including flower, sphere, dendrite, rod, sheet, and cabbage onto the aligned MWCNTs at room temperature. Especially, among all the synthesis methods for Au nanocrystals, this is the first report using electrochemical technique to synthesize wide variety shapes of gold nanostructures (GNs) onto the aligned MWCNTs. The morphology of electrodeposited Au nanostructures was controlled by adjustment of the deposition time and potential, the number of potential cycles, the kind of deposition bath, and electrodeposition method. Transmission electron microscopy and field-emission scanning electron microscopy were used to characterize the products. Cyclic voltammograms showed that the MWCNT/Ta electrodes modified with GNs have higher sensitivity compared to the unmodified electrodes in the presence of Fe2+/Fe3+ redox couple. These kinds of aligned-CNT/Au nanostructure hybrid materials introduced by these efficient and simple electrochemical methods could lead to the development of a new generation device for ultrasensitive catalytic and biological application.
机译：已经开发出一种有效的方法，以通过化学气相沉积法在导电Ta基板上合成取向良好的多壁碳纳米管（MWCNT）。独立式MWCNTs阵列通过电化学氧化功能化，形成羟基和羧基官能团。然后，在室温下，开发了无模板的电化学途径，用于将不常见的Au纳米结构（包括花，球，枝晶，棒，片和卷心菜）形状选择性合成到对齐的MWCNT上。特别是，在所有用于Au纳米晶体的合成方法中，这是第一个使用电化学技术将各种形状的金纳米结构（GNs）合成到排列的MWCNT上的报道。通过调整沉积时间和电势，电势循环数，沉积浴的种类和电沉积方法，可以控制电沉积金纳米结构的形貌。用透射电子显微镜和场发射扫描电子显微镜表征产物。循环伏安图显示，在存在Fe2 + / Fe3 +氧化还原对的情况下，用GNs修饰的MWCNT / Ta电极比未修饰的电极具有更高的灵敏度。通过这些有效和简单的电化学方法引入的这类排列的CNT / Au纳米结构杂化材料可导致开发用于超灵敏催化和生物应用的新一代装置。

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