【作者】 王伟；

【Author】 Wei Wang;School of Chemistry and Chemical Engineering, Nanjing University;

【机构】 南京大学化学化工学院；

【摘要】 光学显微成像技术具有优良的时间、空间分辨率,十分适合于微观、异质体系的原位、动态和定量分析,既是生命科学和材料科学中不可或缺的研究手段,也是分析化学前沿研究领域之一。以电化学成像研究为例,传统基于电流测量的电化学技术难以分辨电子转移过程发生的位点和空间分布,不利于对纳米界面和非均匀界面的电化学研究。近年来,光学显微成像技术获得了快速发展,已有多种技术能够实现对单纳米粒子甚至单分子电化学过程的光学成像。本文介绍了利用表面等离子共振显微成像技术在单纳米粒子电化学研究方面取得的一些研究进展,具体包括单个LiCoO2纳米粒子的充放电动力学研究,以及单粒子碰撞电化学过程的光学成像。更多还原

【Abstract】 Measuring electrochemical activities of nanomaterials is critical for creating novel catalysts, for developing ultrasensitive sensors and for understanding fundamental nanoelectrochemistry.However, traditional electrochemical methods measure a large number of nanoparticles, which wash out the properties of individual nanoparticles.We report here a study of transient electrochemical reactions of single nanoparticles during collision with an electrode, and voltammetry of single nanoparticles immobilized on the electrode using a plasmonic-based electrochemical current microscopy.This technique images both electrochemical reaction and size of the same individual nanoparticle, enabling quantitative examination of size-dependent electrochemical activities at single nanoparticle level.We observed a large variability of electrochemical activities between different nanoparticles, which underscores the importance of single nanoparticle analysis.更多还原