Analysis of heavy-metal ions using mercury microelectrodes and a solid-state reference electrode on a Si wafer

Kwang Seok Yun, Hong Jeong Kim, Segyeong Joo, Juhyoun Kwak, Euisik Yoon

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Micro working electrodes and a solid-state reference electrode have been fabricated using semiconductor processes for electrochemical detection of heavy-metal ions in aqueous media. The working electrodes are mercury-coated platinum microelectrodes 5 μm, 10 μm and 25 μm in diameter. The smaller electrode shows the higher sensitivity and the detection limits of the 5-μm-diameter electrodes are about 0.2 ppb and 0.4 ppb for cadmium and lead ions, respectively. The reference electrode is a Ag/AgCl electrode coated by polyvinyl chloride (PVC)/Nafion layer containing Cl- ions. The potential variation of the fabricated solid-state reference electrodes is about 55 mV under a 0.1 M Cl- concentration.

Original languageEnglish
Pages (from-to)7159-7163
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume39
Issue number12 B
Publication statusPublished - 2000 Dec 1

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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