ITO负载内凹AuPd合金纳米粒子形状的电化学调控

发布时间：2018-01-09 19:13

本文关键词：ITO负载内凹AuPd合金纳米粒子形状的电化学调控　出处：《中国科学:化学》2017年05期 　论文类型：期刊论文

【摘要】：运用电化学方波电位法,在氧化铟锡(ITO)透明导电膜玻璃基底上实现AuPd纳米粒子的形状控制合成.当固定方波下限电位0.30 V,上限电位分别为0.64和0.70 V时,分别制备出内凹三八面体(TOH)和内凹六八面体(HOH)AuPd合金纳米粒子.运用扫描电镜(SEM)、X射线能量散射谱(EDX)和电化学循环伏安法表征所制备的纳米粒子,结果表明所制备的AuPd纳米粒子在ITO上分散均匀,具有清晰的内凹三八面体和内凹六八面体的形状,Au:Pd元素比均接近3:1.但由于Au比Pd的表面自由能低,导致Au在AuPd合金纳米粒子表面富集.发现从合成的TOH AuPd合金纳米粒子出发,对其施加下限电位0.30 V、上限电位0.70 V的方波电位处理,可实现由TOH向HOH形状转变;延长方波电位处理时间仅改变AuPd合金纳米粒子的尺寸,但HOH形状保持不变.
[Abstract]:Using square wave potential method in electrochemistry, indium tin oxide (ITO) to realize shape controlled synthesis of AuPd nanoparticles of transparent conductive film on glass substrate. When the fixed square wave potential limit of 0.30 V, maximum potential were 0.64 and 0.70 V, were prepared by the concave surface of the body 38 (TOH) and a concave surface 68 body (HOH) AuPd alloy nanoparticles. Using scanning electron microscopy (SEM), energy dispersive X ray spectroscopy (EDX) and electrochemical cyclic voltammetry characterization of the prepared nanoparticles, the results showed that the prepared AuPd nanoparticles dispersed in ITO, with a concave 38 surface and concave surface of the clear 68 the shape of Au:Pd, element ratio were close to 3:1. but Au can lower than the surface free of Pd, leading to Au in the AuPd alloy nanoparticles surface enrichment. Found starting from the TOH AuPd alloy nanoparticles were synthesized and applied to the lower limit position of electric potential 0.30 V and 0.70 V square wave potential The transformation from TOH to HOH can be realized, and the time of prolonging the square wave potential only changes the size of the AuPd alloy nanoparticles, but the shape of HOH remains the same.

【作者单位】：厦门大学化学化工学院化学系固体表面物理化学国家重点实验室;
【基金】：国家自然科学基金(编号:21621091)资助项目
【分类号】：O614.123;TB383.1
【正文快照】： 国家自然科学基金(编号:2 1 6 2 1 0 9 1)资助项目氧化铟锡(I T O)具有优良的光透性、良好的导电性、稳定的化学和电化学性质,作为一种良好的电极材料广泛应用于电化学检测[1]和电致化学发光等领域.例如,用电沉积的方法在I T O导电玻璃表面修饰金纳米粒子(A u N P s),可以将其

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