CuO/ZnOヘテロ接触系における選択的COガス検知に適したCuO表面

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The surface properties of copper oxide (CuO) were discussed for considering the working mechanism of a CuO/ZnO heterocontact gas sensor having carbon monoxide (CO) gas selectivity. We focused on p-type semiconducting CuO, using sodium as a dopant, which is a key material for selective CO gas sensing and its surface properties were characterized by XPS, TPD and FT-IR analyses. It was found that the Cu/O ratio of the 1 mol% Na_2C0_3-added CuO surface was higher than that of pure CuO surface by XPS analysis. By TPD analysis, it was found that CO was adsorbed more strongly on I mol% Na_2CO_3-added CuO than on pure CuO. By the in situ IR measurement of CO adsorbed on the surface of 1 mol% Na_2O_3-added CuO specimen under 300℃, we found two asymmetric bands of CO, whereas an asymmetric streching CO_2 band was found on IR measurement of pure CuO specimen. It was confirmed that Cu atoms on pure CuO surface exposed to CO at 300℃ changed from Cu^<2+> to Cu^<1+> or Cu^<0>, in contrast to Cu atoms on 1 mol% Na_2CO_3-added CuO surface, which changed to Cu^<2+>. The electrical conductivity was measured as a function of temperature for pure CuO, CuO with 1 mol% Na_2CO_3 and ZnO specimens. The resistivity of ZnO was larger than that of pure CuO and CuO with 1 mol% Na_2CO_3 by three and six orders of magnitude at 250℃, respectively. A working mechanism of CuO (Na) /ZnO heterocontact gas sensor was elucidated in order to explain its high CO selectivity.
社団法人日本セラミックス協会の論文
1996-05-01

CuO/ZnOヘテロ接触系における選択的COガス検知に適したCuO表面

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