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Observation of single metal nanoparticle collisions by open circuit (mixed) potential changes at an ultramicroelectrode.

Authors
  • Zhou, Hongjun
  • Park, Jun Hui
  • Fan, Fu-Ren F
  • Bard, Allen J
Type
Published Article
Journal
Journal of the American Chemical Society
Publisher
American Chemical Society
Publication Date
Aug 15, 2012
Volume
134
Issue
32
Pages
13212–13215
Identifiers
DOI: 10.1021/ja305573g
PMID: 22839524
Source
Medline
License
Unknown

Abstract

Single nanoparticle (NP) collisions were successfully observed by a potentiometric measurement. The open circuit potential (OCP) of a measuring Au ultramicroelectrode (UME) changes when Pt NPs collide with the UME in a hydrazine solution. The OCP change is related to the redox processes, the concentration of particles, particle size, and electrode size. Compared with the amperometric technique, this approach has several advantages: higher sensitivity, simpler apparatus, fewer problems with NP decomposition, and contamination.

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