Abstract
A detector with a porous alumina substrate has been developed to monitor vinyl chloride gas in the concentration range of 0.5–4% at room temperature successfully. Several operating variables, including type of supporting electrolyte, applied potential, concentration of supporting electrolyte, and porosity of alumina substrate were investigated to find the highest sensitivity for vinyl chloride sensing. Compared with tetrabutylammonium tetrafluoborate, higher sensitivities were obtained when tetrabutylammonium perchlorate was used as the supporting electrolyte. The highest sensitivity of 70.9 μA%−1 was obtained at −2.1 V (vs. Ag/Ag+) in 50% toluene/50% DMF electrolyte containing 10 mM Bu4NClO4 supporting electrolyte. The sensing current and the sensitivity for vinyl chloride increased significantly with the porosity of the porous alumina substrate.
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