| Autor: |
Grijalva, Heriberto, Inoue, Motomichi |
| Zdroj: |
Journal of Materials Chemistry; February 2000, Vol. 10 Issue: 2 p531-533, 3p |
| Abstrakt: |
Treatment of CuS films with AgNO3 solutions gave CuS/Ag2S films with concentration ratios Cu/Ag of 0.080.15. These materials were characterized by scanning electron microscopy and X-ray powder diffraction, and their Cu2+-detecting capabilities were studied by a potentiometric method. A uniform secondary-electron image was observed for a CuS/Ag2S film prepared from a CuS film having a high crystallinity. An electrode constructed with the resulting mixed-sulfide film was capable of detecting Cu2+ ions down to a concentration as low as 10−7 mol dm−3. A CuS/Ag2S film obtained from amorphous CuS had a heterogeneous surface and as an electrode was inactive towards Cu2+. The rate of reaction between CuS and Ag+ is dependent on the crystallinity of CuS, with CuS films of a high crystallinity being resistant to the attack of Ag+ so that the reaction is slow enough to provide a uniform and well-adhering CuS/Ag2S film. |
| Databáze: |
Supplemental Index |
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