Influence of Self-Assembled Alkanethiol Monolayers on Stochastic Amperometric On-Chip Detection of Silver Nanoparticles

Kay J. Krause, Nouran Adly, Alexey Yakushenko, Jan Schnitker, Dirk Mayer, Andreas Offenhäusser, Bernhard Wolfrum

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Abstract

We investigate the influence of self-assembled alkanethiol monolayers at the surface of platinum microelectrode arrays on the stochastic amperometric detection of citrate-stabilized silver nanoparticles in aqueous solutions. The measurements were performed using a microelectrode array featuring 64 individually addressable electrodes that are recorded in parallel with a sampling rate of 10 kHz for each channel. We show that both the functional end group and the total length of the alkanethiol influence the charge transfer. Three different terminal groups, an amino, a hydroxyl, and a carboxyl, were investigated using two different molecule lengths of 6 and 11 carbon atoms. Finally, we show that a monolayer of alkanethiols with a length of 11 carbon atoms and a carboxyl terminal group can efficiently block the charge transfer of free nanoparticles in an aqueous solution. (Figure Presented).

Original languageEnglish
Pages (from-to)3632-3637
Number of pages6
JournalAnalytical Chemistry
Volume88
Issue number7
DOIs
StatePublished - 5 Apr 2016

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