ナトリウムを添加した酸化銅及び酸化亜鉛よりなるpnヘテロ接触の複素インピーダンス特性を用いた一酸化炭素ガスの識別

概要

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To improve the gas selectivity for carbon monoxide from hydrogen, the complex impedance characteristics under DC bias voltages were studied on a pn semicon ductor heterocontact comprised of I mol% Na_2O added CuO (as a p type semiconductor) and ZnO (as an n-type) , in the atmosphere of air balanced CO or H_2 gas (concentration : 4000 ppm) at 250 and 400℃. In this heterocontact system, the capacitance component of the equivalent circuit at the interface at 250℃ was larg er in the CO mixture, but smaller in the H_2 mixture than that in air. As the results of characteristic changes of the equivalent circuit components to each ambiellt gas at 250℃, it was shown that CO gas was selectively distinguishable from H_2 gas by using a decrease in the absolute value of reactance at 10kHz under the bias voltage of -1 V. Moreover, the iden tification of CO and H_2 gases was shown to be feasible by DC bias dependence of reactance at a fixed frequen cy and by frequency dependence of reactance at a fixed DC bias. The CO gas identification by use of Na modified CuO/ZnO was found to be feasible at a lower temperature of 250℃ than that for Na free CuO/ZnO (at 400℃)
社団法人日本セラミックス協会の論文
1994-09-01