Department of Chemistry, Queens College, City University of New York, 6530 Kissena Boulevard Flushing, New York 11367, United States.
The Graduate Center of CUNY, New York, New York 10016, United States.
Anal Chem. 2021 Apr 6;93(13):5377-5382. doi: 10.1021/acs.analchem.1c00358. Epub 2021 Mar 26.
Scanning electrochemical microscopy (SECM) is a powerful technique for mapping surface reactivity and investigating heterogeneous processes on the nanoscale. Despite significant advances in high-resolution SECM and photo-SECM imaging, they cannot provide atomic scale structural information about surfaces. By correlating the SECM images with atomic scale structural and bonding information obtained by transmission electron microscopy (TEM) techniques with one-to-one correspondence, one can elucidate the nature of the active sites and understand the origins of heterogeneous surface reactivity. To enable multitechnique imaging of the same nanoscale portion of the electrode surface, we develop a methodology for using a TEM finder grid as a conductive support in SECM and photo-SECM experiments. In this paper, we present the results of our first nanoscale SECM and photo-SECM experiments on carbon TEM grids, including imaging of semiconductor nanorods.
扫描电化学显微镜（SECM）是一种强大的技术，可用于绘制表面反应性并研究纳米尺度上的多相过程。尽管在高分辨率 SECM 和光 SECM 成像方面取得了重大进展，但它们无法提供有关表面的原子级结构信息。通过将 SECM 图像与通过透射电子显微镜（TEM）技术获得的原子级结构和键合信息相关联，并具有一一对应的关系，可以阐明活性位点的性质，并了解多相表面反应性的起源。为了能够对电极表面的同一纳米级部分进行多种技术成像，我们开发了一种使用 TEM finder 网格作为 SECM 和光 SECM 实验中的导电支撑的方法。在本文中，我们介绍了在碳 TEM 网格上进行的第一个纳米级 SECM 和光 SECM 实验的结果，包括对半导体纳米棒的成像。
