Details

Autor(en) / Beteiligte

• Meekins, Benjamin H

Titel

Detection of single metal nanoparticle collision events in non-aqueous mediaElectronic supplementary information (ESI) available: DLS measurements of colloidal Au NPs in toluene and in collision experiment electrolyte. Chronoamperogram of Pt UME in the absence of Au nanoparticles. Gaussian and lognormal fitting of current step distribution. TEM images of as-prepared Au NPs. See DOI: 10.1039/c7cp03042h

Erscheinungsjahr

2017-07

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• In this work, the detection of metal nanoparticle collision events in a non-aqueous solvent-here, toluene and acetonitrile-using gold nanoparticles and a platinum ultramicroelectrode (UME) is reported. The collisions were monitored by the oxidation of tri- n -propylamine (TPrA) under diffusion-dominated conditions. Based on the current response, it was observed that the current steps were indicative of a mediated Faradaic reaction. Current steps as small as 1-2 pA could be clearly observed. Larger current steps were caused by agglomeration of the nanoparticles attributed to the polarity of the mixed solvent. The experimentally observed collisions per second ranged from 0.07 to 0.51, indicating that particle agglomeration in solution occurs rapidly, reversibly and can subsequently cause rapid and, often, repeated collisions. We demonstrate detection of single metal nanoparticle collisions in non-aqueous media and discuss challenges revealed by results.