纳米电极上单个银纳米颗粒氧化电流分辨能力的研究

发布时间：2018-01-12 16:00

本文关键词：纳米电极上单个银纳米颗粒氧化电流分辨能力的研究　出处：《化学学报》2017年07期 　论文类型：期刊论文

【摘要】：在单体电化学的研究中,提高信号分辨能力是一项挑战.缩小电极尺寸有利于对体系噪音电流的控制,有望提高电流的分辨能力.本研究制备了直径为480 nm的铂纳米圆盘电极,选用银纳米颗粒碰撞电极产生银电化学氧化行为作为模型,考察了纳米电极相对于微米电极在单体电化学信号分辨能力上的优化作用.研究表明,不同尺寸电极上观察到的银纳米颗粒的碰撞频率符合扩散控制的碰撞规律.说明单个电流信号对应于单个纳米颗粒的电化学氧化过程.同时,当电极尺寸缩小至纳米尺度后,噪音电流下降50%左右,提高了对银纳米颗粒碰撞电极过程中氧化电流的分辨能力.研究结果表明使用纳米电极能进一步提高对单体电化学中微小电流的检测能力.
[Abstract]:In the study of monomer electrochemistry, improving the signal resolution is a challenge. Reducing the electrode size is beneficial to the control of the noise current of the system. In this study, platinum nanometer-disk electrode with diameter of 480 nm was prepared. Silver nanoparticles collision electrode was selected as the model of silver electrochemical oxidation. The effect of nano-electrode on the electrochemical signal resolution of monomers was investigated compared with that of micron electrode. The collision frequency of silver nanoparticles observed on different sizes of electrodes accords with the law of diffusion controlled collision. It shows that the single current signal corresponds to the electrochemical oxidation process of single nanoparticles. At the same time. When the electrode size is reduced to nanometer scale, the noise current decreases by about 50%. The ability of resolving the oxidation current in the process of silver nanoparticles colliding electrode is improved, and the results show that the detection ability of micro current in monomer electrochemistry can be further improved by using nanocrystalline electrode.
【作者单位】：华东理工大学化学与分子工程学院结构可控先进功能材料及其制备教育部重点实验室;
【基金】：国家自然科学基金(Nos.21421004,21327807) 中央高校基本科研业务费专项资金(No.222201313004)资助~~
【分类号】：O657.1;TB383.1
【正文快照】： 项目受国家自然科学基金(Nos.21421004,21327807)和中央高校基本科研业务费专项资金(No.222201313004)资助.1引言单个实体电化学(简称单体电化学,Single entityelectrochemistry)包括对单个纳米材料(纳米颗粒、纳米管及纳米线)的电化学和电催化活性、单个功能材料的性能、单个

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