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000904343 1001_ $$00000-0002-6943-737X$$aWeiß, Lennart J. K.$$b0
000904343 245__ $$aEngineering Electrostatic Repulsion of Metal Nanoparticles for Reduced Adsorption in Single-Impact Electrochemical Recordings
000904343 260__ $$aWashington, DC$$bACS Publications$$c2021
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000904343 520__ $$aStochastic impact electrochemistry is a promising concept to detect ultralow concentrations of nanoparticles in solution. However, statistically reliable sensor outputs require an appropriate number of observed nanoparticle collision events. Here, arrays of individually addressable electrodes allow increasing the effective detection area, and thereby the number of collision events, without sacrificing the signal-to-noise ratio. At the same time, however, these measurements typically increase the surface-to-volume ratio of the system, leading to a stronger influence of adsorption on the number of available particles. We address this issue of nanoparticle adsorption by controlling the electrode–electrolyte interface close to the detection electrodes. We use a direct nanoimpact experiment to demonstrate that a negatively charged surface leads to electrostatic repulsion, which results in a 2.5-fold increase in the number of detected collision events. Adding to this improved sensor performance, a tunable shield electrode offers a versatile tool to study nanoparticle adsorption at the solid–liquid interface.
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000904343 7001_ $$00000-0002-1583-7597$$aMusic, Emir$$b1
000904343 7001_ $$0P:(DE-HGF)0$$aRinklin, Philipp$$b2
000904343 7001_ $$00000-0003-4939-8526$$aStraumann, Lea$$b3
000904343 7001_ $$00000-0002-2696-7725$$aGrob, Leroy$$b4
000904343 7001_ $$0P:(DE-Juel1)128707$$aMayer, Dirk$$b5$$eCorresponding author
000904343 7001_ $$0P:(DE-HGF)0$$aWolfrum, Bernhard$$b6$$eCorresponding author
000904343 773__ $$0PERI:(DE-600)2916552-0$$a10.1021/acsanm.1c01507$$gVol. 4, no. 8, p. 8314 - 8320$$n8$$p8314 - 8320$$tACS applied nano materials$$v4$$x2574-0970$$y2021
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