Hybrid amperometric and conductometric chemical sensor based on conducting polymer nanojunctions

Erica Forzani, Xiulan Li, Nongjian Tao

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

We report on a hybrid chemical sensor that can perform either amperometric or conductometric detection alone or simultaneously. It consists of an array of electrode pairs in which the two electrodes in each pair are separated with micrometer to nanometer-scale gaps. The gaps are bridged with conducting polymer (polyaniline) so that one can measure the conductance of the polymer bridge like a conventional Chem-FET. The electrode geometries are designed to allow simultaneously detection of electrochemical current like a conventional microelectrode amperometric sensor. The hybrid device provides increased selectivity for detection of analytes in complex matrixes and may provide new insights into the electrochemical reaction mechanisms of analytes. As an example, we have demonstrated the detection of dilute neurotransmitter (dopamine) in the presence of its concentrated major physiological interferent, ascorbic acid, which is not possible using either the amperometric or the conductometric techniques alone.

Original languageEnglish (US)
Pages (from-to)5217-5224
Number of pages8
JournalAnalytical chemistry
Volume79
Issue number14
DOIs
StatePublished - Jul 15 2007

ASJC Scopus subject areas

  • Analytical Chemistry

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