Plasmonic Imaging of Oxidation and Reduction of Single Gold Nanoparticles and Their Surface Structural Dynamics

Adaly Garcia, Shaopeng Wang, Nongjian Tao, Xiaonan Shan, Yixian Wang

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Gold nanoparticles (AuNPs) have been widely used in catalytic electrochemistry. Heterogeneity in size, shape, and surface sites leads to variable, particle-specific catalytic activities. Conventional electrochemical methods can only obtain the collective responses from all the catalytic nanoparticles on the electrode surface; the heterogeneity of particle performance will be averaged. Alternatively, plasmonic electrochemical imaging (PECi) is capable of imaging the electrochemical activity at individual nanoparticles. In this work, PECi was used to image the oxidation and reduction of the gold surface at individual AuNPs, and their associated structural alterations were successfully measured. We have studied the electrochemical responses from gold nanocubes, gold nanorods, and gold nanowires with PECi and observed different surface redox activities. We have also demonstrated the capability of monitoring the surface dynamics at individual AuNPs utilizing characteristic PECi derived cyclic voltammograms (CVs).

Original languageEnglish (US)
Pages (from-to)502-507
Number of pages6
JournalACS sensors
Issue number2
StatePublished - Feb 26 2021


  • gold nanoparticles
  • nanocubes
  • nanorods
  • nanowires
  • plasmonic electrochemical imaging
  • single nanoparticle electrochemistry
  • surface facets

ASJC Scopus subject areas

  • Bioengineering
  • Instrumentation
  • Process Chemistry and Technology
  • Fluid Flow and Transfer Processes


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