Potential-Controlled Adsorption, Separation, and Detection of Redox Species in Nanofluidic Devices

Jin Cui, Klaus Mathwig, Dileep Mampallil, Serge G. Lemay* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)
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Abstract

Nanoscale channels and electrodes for electrochemical measurements exhibit extreme surface-to-volume ratios and a correspondingly high sensitivity to even weak degrees of surface interactions. Here, we exploit the potential-dependent reversible adsorption of outer-sphere redox species to modulate in space and time their concentration in a nanochannel under advective flow conditions. Induced concentration variations propagate downstream at a species-dependent velocity. This allows one to amperometrically distinguish between attomole amounts of species based on their time-of-flight. On-demand concentration pulse generation, separation, and detection are all integrated in a miniaturized platform.

Original languageEnglish
Pages (from-to)7127-7130
Number of pages4
JournalAnalytical chemistry
Volume90
Issue number12
DOIs
Publication statusPublished - 19 Jun 2018

Keywords

  • UT-Hybrid-D

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