Abstract
Two kinds of SnO2-Co3O4 composites, SC1 and SC50, the Co3O4 contents of which were 1 and 50 mass%, respectively, were loaded with small amounts of Au (0.05, 0.5 and 1 mass%). The thick film device using SC1, characterized by high sensitivity to both CO and H2 at 250 °C, was found to be made more sensitive without significant alterations of selectivity between CO and H2 as the amount of Au-loaded increased up to 0.5%, while the addition of 1 mass% Au degraded the sensing properties seriously. Similar promoting effects of Au were recognized for the SC50-based devices, which were p-type semiconductors responding fairly selectively to CO over H2 at 100 °C. The promoting effects of Au were discussed briefly based on the behavior of electrical resistances of the Au-loaded devices.
Original language | English |
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Pages (from-to) | 397-401 |
Number of pages | 5 |
Journal | Sensors and Actuators, B: Chemical |
Volume | 107 |
Issue number | 1 SPEC. ISS. |
DOIs | |
Publication status | Published - May 27 2005 |
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Instrumentation
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry