Abstract
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 language | English |
|---|---|
| Pages (from-to) | 5141-5144 |
| Number of pages | 4 |
| Journal | Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers |
| Volume | 40 |
| Issue number | 8 |
| Publication status | Published - 2001 Aug 1 |
Keywords
- Dualmicroelectrode
- Methanol sensing
- Nafion-coated electrode
- Ultramicroelectrode
- Vapor phase
ASJC Scopus subject areas
- Engineering(all)
- Physics and Astronomy(all)