Abstract
A series of Co3O4-loaded SnO2 nanocomposite thick films were prepared by grinding, screen-printing and sintering at 700 C for 3 h. XRD data showed the nanocomposite thick films were rutile structure of SnO2 and cubic Co3O4. The composite films were found to exhibit good response to alcohol and acetone at 300 C. The film went through a sharp sensitivity maximum at 5 mol%CoO4/3 with a change in Co3O4 content. At 300 C, the maximum sensor response to alcohol and acetone, each 1000 ppm in air, was 301 and 235, respectively, which was about 7 and 5 times as large as that of the pure SnO2 respectively. The selectivity to alcohol and acetone over H2 and CO also was promoted by the addition of Co3O4 to SnO2. The mechanism of such strong promotion of sensor response (electronic sensitization) is discussed.
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