Observation of Single Metal Nanoparticle Collisions by Open Circuit (mixed) Potential Changes at an Ultramicroelectrode

Overview

Journal J Am Chem Soc

Publisher American Chemical Society

Specialty Chemistry

Date 2012 Jul 31

PMID 22839524

Citations 13

Authors

Hongjun Zhou

Jun Hui Park

Fu-Ren F Fan

Allen J Bard

Affiliations

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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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