Control of electrochemical reaction by amorphous carbon nano-particles and development of high-sensitive gas sensor

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The objective of this study was to create a-C surface with higher electro-catalytic activity by controlling chemical compositions and sizes of amorphous carbon nano-particles, and to establish the electrochemical method to detect hazardous materials like AsH3and PH3quantitatively. The concentration of dopant atoms showing p type conductivity was tried to be controlled. Carrier concentration of p-type a-C could be successfully varied in the range from 1014cm-3to 1.3×1019cm-3 by changing the ratio of trimethyl borateand n-hexane used as source materials. Boron atoms were confirmed to serve as an electro-catalyst for hydrogen evolution. Since the reactivity to hydrogen evolution could be suppressed at a-C films doped with tiny amounts of boron, Mn2+ion could be efficiently reduced. It results that Mn2+ion at extremely lower concentration (0.02 mM) than discharge standard (0.2 mM) could be detected quantitatively.