TY  - JOUR
AU  - Krause, Kay J.
AU  - Brings, Fabian
AU  - Schnitker, Jan
AU  - Kätelhön, Enno
AU  - Rinklin, Philipp
AU  - Mayer, Dirk
AU  - Compton, Richard G.
AU  - Lemay, Serge G.
AU  - Offenhäusser, Andreas
AU  - Wolfrum, Bernhard
TI  - The Influence of Supporting Ions on the Electrochemical Detection of Individual Silver Nanoparticles: Understanding the Shape and Frequency of Current Transients in Nano-impacts
JO  - Chemistry - a European journal
VL  - 23
IS  - 19
SN  - 0947-6539
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2017-06414
SP  - 4638 - 4643
PY  - 2017
AB  - We report the influence of electrolyte composition and concentration on the stochastic amperometric detection of individual silver nanoparticles at microelectrode arrays and show that the sensor response at certain electrode potentials is dependent on both the conductivity of the electrolyte and the concentration of chloride ions. We further demonstrate that the chloride concentration in solution heavily influences the characteristic current spike shape of recorded nanoparticle impacts: While typically too short to be resolved in the measured current, the spike widths are significantly broadened at low chloride concentrations below 10 mm and range into the millisecond regime. The analysis of more than 25 000 spikes reveals that this effect can be explained by the diffusive mass transport of chloride ions to the nanoparticle, which limits the oxidation rate of individual silver nanoparticles to silver chloride at the chosen electrode potential.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000399326500016
C6  - pmid:28182315
DO  - DOI:10.1002/chem.201605924
UR  - https://juser.fz-juelich.de/record/837518
ER  -