Detection of CO using bulk ZnO Schottky rectifiers |
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| Authors: | BS Kang S Kim F Ren K Ip YW Heo BP Gila CR Abernathy DP Norton SJ Pearton |
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| Institution: | (1) Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA;(2) Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611, USA |
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| 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. PACS 81.05.Dz; 73.61.Ga; 72.80.Ey |
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