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- Title
Detection of CO using bulk ZnO Schottky rectifiers.
- Authors
Kang, B. S.; Kim, S.; Ren, F.; Ip, K.; Heo, Y. W.; Gila, B. P.; Abernathy, C. R.; Norton, D. P.; Pearton, S. J.
- Abstract
Bulk Pt/ZnO Schottky rectifiers show gas sensitivities for CO of 4% and 8%, respectively, at 150 °C for 1 and 10% CO in N2. The current or voltage changes are time dependent, with an activation energy of 40.7 kJ?mol-1. Over a limited range of partial pressures of CO (PCO) in the ambient gas, the on-state resistance R of the sensor at fixed bias voltage decreased according to R=(RO+A(PCO)0.5)-1, where A is a constant and RO is the resistance in N2. Since these devices are also sensitive to H2 and C2H4, the ZnO rectifiers appear promising for a range of gas-sensing applications.
- Subjects
CARBON monoxide; CARBON monoxide detectors; CORNETT; CARTOGRAPHY; VOLTAGE regulators; GAS appliances
- Publication
Applied Physics A: Materials Science & Processing, 2005, Vol 80, Issue 2, p259
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-004-2666-2