Exploring dynamic interactions of single nanoparticles at interfaces for surface-confined electrochemical behavior and size measurement

Hui Ma, Jian-Fu Chen, Hai-Feng Wang, Pei-Jun Hu, Wei Ma () and Yi-Tao Long ()
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Hui Ma: East China University of Science and Technology
Jian-Fu Chen: East China University of Science and Technology
Hai-Feng Wang: East China University of Science and Technology
Pei-Jun Hu: East China University of Science and Technology
Wei Ma: East China University of Science and Technology
Yi-Tao Long: East China University of Science and Technology

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract With the development of new instruments and methodologies, the highly dynamic behaviors of nanoparticle at the liquid-solid interface have been studied. However, the dynamic nature of the electrochemical behavior of individual nanoparticles on the electrode interface is still poorly understood. Here, we generalize scaling relations to predict nanoparticle-electrode interactions by examining the adsorption energy of nanoparticles at an ultramicroelectrode interface. Based on the theoretical predictions, we investigate the interaction-modulated dynamic electrochemical behaviors for the oxidation of individual Ag nanoparticles. Typically, significantly distinct current traces are observed owing to the adsorption-mediated motion of Ag nanoparticles. Inspired by restraining the stochastic paths of particles in the vicinity of the electrode interface to produce surface-confined current traces, we successfully realize high-resolution size measurements of Ag nanoparticles in mixed-sample systems. This work offers a better understanding of dynamic interactions of nanoparticles at the electrochemical interface and displays highly valuable applications of single-entity electrochemistry.

Date: 2020
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DOI: 10.1038/s41467-020-16149-0

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