Single nanoparticle collisions at microfluidic microband electrodes: The effect of electrode material and mass transfer

Timothy M. Alligrant, Morgan J. Anderson, Radhika Dasari, Keith J. Stevenson, Richard M. Crooks

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

We report on the effect of convection on electrochemically active collisions between individual Pt nanoparticles (PtNPs) and Hg and Au electrodes. Compared to standard electrochemical cells utilizing Hg and Au ultramicroelectrodes (UMEs) used in previous studies of electrocatalytic amplification, microelectrochemical devices offer two major advantages. First, the PtNP limit of detection (0.084 pM) is ∼8 times lower than the lowest concentration measured using UMEs. Second, convection enhances the mass transfer of PtNPs to the electrode surface, which enhances the collision frequency from ∼0.02 pM-1 s-1 on UMEs to ∼0.07 pM-1 s-1 in microelectrochemical devices. We also show that the size of PtNPs can be measured in flowing systems using data from collision experiments and then validate this finding using multiphysics simulations.

Original languageEnglish
Pages (from-to)13462-13469
Number of pages8
JournalLangmuir
Volume30
Issue number44
DOIs
Publication statusPublished - 11 Nov 2014
Externally publishedYes

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