Methanol gas sensing using ultramicroelectrodes: Studies on sensing mechanism and its enhancement

M. Umeda, A. Kabasawa, M. Kokubo, M. Mohamedi, T. Itoh, I. Uchida

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8 Citations (Scopus)


Electrochemical detection of methanol vapor has been achieved using a highly sensitive small detector by an ultramicroelectrode-based electrochemical method. First, a peak current was observed by employing potential sweep voltammetry at a microring ring electrode. The current peak was confirmed to be that of the methanol vapor. Next, (i) the potential-sweep rate dependence of the peak current at the microring ring electrode, and (ii) the electrode-gap width dependence of the cyclic voltammogram at the microgap electrode were measured. Based on the results, the electrochemical-detection mechanism of vapor methanol has been proposed. Finally, an enhancement method for detecting methanol vapor was achieved by the proposed mechanism. Namely, using a Nafion®-membrane-coated dualmicroelectrode we succeeded in detecting the methanol vapor by approximately 200 times higher than that by the bare electrode at an applied voltage of 4 V.

Original languageEnglish
Pages (from-to)5141-5144
Number of pages4
JournalJapanese Journal of Applied Physics
Issue number8
Publication statusPublished - 2001 Aug


  • Dualmicroelectrode
  • Methanol sensing
  • Nafion-coated electrode
  • Ultramicroelectrode
  • Vapor phase


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