Capacitive-type gas sensor for the selective detection of carbon dioxide

✍ Scribed by Tatsumi Ishihara; Kazuhiro Kometani; Yukako Mizuhara; Yusaku Takita

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 278 KB
• Volume: 13
• Category: Article
• ISSN: 0925-4005
• DOI: 10.1016/0925-4005(93)85429-e

✦ Synopsis

The capacitances of CuO mixed with BaSnO,, SrTiOs, CaTiOs, and ZnO are dependent on the CO2 concentration, similarly to that of CuO-BaTiO,.

In particular, the mixed oxide CuO-SrTiO, is more sensitive to CO, than CuO-BaTiO,, and the mixed-oxide capacitor CuO-BaSnO, is promising for sensing CO2 over a wide range of concentrations. Moreover, addition of Ag to CuO-BaTi mixed oxide is effective for enhancing the sensitivity to CO*. The sensitivity (Cc&C,i,) to 2% CO2 of Ag-added CuO-BaTi03, which has been calcined at 700 "C followed by operation for 60 h, is as high as 70.