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.
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81.05.Dz; 73.61.Ga; 72.80.Ey
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Kang, B., Kim, S., Ren, F. et al. Detection of CO using bulk ZnO Schottky rectifiers. Appl. Phys. A 80, 259–261 (2005). https://doi.org/10.1007/s00339-004-2666-2
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DOI: https://doi.org/10.1007/s00339-004-2666-2