Abstract
Catalytic palladium nanoparticle modified reduced graphene oxide (rGO) prepared in the laboratory showed a characteristic variation in hydrogen response when the operating temperature was raised from 30 °C to 125 °C. When exposed to a particular hydrogen concentration, the response comprising of initial increase in device resistance (response-1) followed by decrease (response-2) was observed up to 75 °C. Beyond 75 °C a transition in hydrogen response was observed, and only the response-1 prevailed from 100 °C. This transition temperature was reduced to 50 °C, when rGO was pretreated with ammonia solution at a temperature of 100 °C. On pretreatment with lower ammonia concentration, the response-2 was completely eliminated. Furthermore, without treatment with palladium nanoparticles, rGO films (both untreated and ammonia treated) showed negligible response toward various concentrations of hydrogen in the studied temperature range (30 °C–125 °C). The material characterization and sensing results were analyzed in detail and a suitable sensing model was proposed to explain the performance of these sensors.
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Acknowledgements
The work was taken up with a sponsored research programme (Grant No. EMR/2016/006287) financed by Science and Engineering Research Board (SERB), under the Department of Science and Technology (DST), Government of India. Shikha Sinha gratefully acknowledges the research fellowship from SERB.
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Kashyap, A., Sinha, S., Bhattacharya, S., Barman, P.B., Hazra, S.K., Basu, S. (2021). Characteristic Response Transition of Reduced Graphene Oxide as Hydrogen Gas Sensor-The Effect of Temperature and Doping Concentration. In: Hazra, A., Goswami, R. (eds) Carbon Nanomaterial Electronics: Devices and Applications. Advances in Sustainability Science and Technology. Springer, Singapore. https://doi.org/10.1007/978-981-16-1052-3_15
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