Plasmonic imaging of electrochemical oxidation of single nanoparticles

Yimin Fang, Wei Wang, Xiang Wo, Yashuang Luo, Shaowei Yin, Yixian Wang, Xiaonan Shan, Nongjian Tao

Research output: Contribution to journalArticlepeer-review

86 Scopus citations

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 oxidation of single Ag 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. The imaging capability further allows detection of the reaction kinetics of each individual nanoparticle and analysis of the average behaviors of multiple nanoparticles. The average kinetics and size dependence can be accurately described by the Tafel equation, but there is a large variability between different nanoparticles, which underscores the importance of single nanoparticle analysis.

Original languageEnglish (US)
Pages (from-to)12584-12587
Number of pages4
JournalJournal of the American Chemical Society
Volume136
Issue number36
DOIs
StatePublished - Sep 10 2014

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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