ZnO-nanorod-based resistor-type ammonia gas sensors with underlying Pt/Cr interdigitated electrodes have been fabricated and investigated. The response is improved by reducing the electrode spacingd. Experimentally, a high response of 80.6 is found whendis reduced to 2 μm under exposure to a 1000-ppm NH3/air gas at 300°C. A lower detection limit of 10-ppm NH3/air at 300°C is also obtained. This device possesses response and recovery times ofdcould be attributed to the formation of more ZnO grain boundaries. A simple cross-linked structure model is presented to interpret the ammonia-gas-sensing performance, and a good correlation between theory and experiment is demonstrated.
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Chen et al. (2012) studied this question.
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