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Updated: May 20, 2026

A Closed-Type Wireless Nanopore Electrode for Analyzing Single Nanoparticles
Published on: March 20, 2019
Observation of single metal nanoparticle collisions by open circuit (mixed) potential changes at an
Hongjun Zhou1, Jun Hui Park, Fu-Ren F Fan
1Center for Electrochemistry, Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712, USA.
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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