Copper-based electrochemical sensor with palladium electrode for cathodic stripping voltammetry of manganese

Wenjing Kang, Xing Pei, Adam Bange, Erin N. Haynes, William R. Heineman, Ian Papautsky

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

In this work, we report on the development of a palladiumbased, microfabricated point-of-care electrochemical sensor for the determination of manganese using square wave cathodic stripping voltammetry. Heavy metals require careful monitoring, yet current methods are too complex for a point-of-care system. Voltammetry offers an attractive approach to metal detection on the microscale, but traditional carbon, gold, or platinum electrodes are difficult or expensive to microfabricate, preventing widespread use. Our sensor uses palladium working and auxiliary electrodes and integrates them with a copper-based reference electrode for simple fabrication and compatibility with microfabrication and printed circuit board processing, while maintaining competitive performance in electrochemical detection. Copper electrodes were prepared on glass substrate using a combination of microfabrication procedures followed by electrodeposition of palladium. The disposable sensor system was formed by bonding a poly(dimethylsiloxane) (PDMS) well to the glass substrate. Cathodic stripping voltammetry of manganese using our new disposable palladium-based sensors exhibited 334 nM (18.3 ppb) limit of detection in borate buffer. The sensor was used to demonstrate manganese determination in natural water samples from a pond in Burnet Woods, located in Cincinnati, OH, and the Ohio River. (Graph Presented).

Original languageEnglish
Pages (from-to)12070-12077
Number of pages8
JournalAnalytical Chemistry
Volume86
Issue number24
DOIs
StatePublished - Dec 16 2014

Bibliographical note

Publisher Copyright:
© 2014 American Chemical Society.

ASJC Scopus subject areas

  • Analytical Chemistry

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