Journal
CHEMICAL PHYSICS LETTERS
Volume 737, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2019.136829
Keywords
Reduced graphene oxide; Heterointerface; Gas sensor; Synergistic effect
Funding
- Shandong Provincial Science and Technology Major Project [2019GGX101029]
- National Science Foundation of Shandong Province [ZR2017BEM049]
- Startup Funding of Distinguished Professorship program [31270086963030]
- China-Germany postdoctoral exchange program [20181032]
- Open Research Fund of Suzhou Institute of Nano-Tech and Nano-Bionics [19LH01]
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Metal oxide semiconductor gas sensors usually have poor response and recovery properties when operated at room temperature. Reduced graphene oxide (RGO)-based sensors suffer the same issues. Here, we demonstrate the suitability of a RGO/SnO2@Au heterostructure for ammonia (NH3) gas detection. This sensor, which is based on the composite structure, shows high gas sensing properties at room temperature (25 degrees C). The gas response of the sensor is up to 58% for the NH3 gas concentration of 10 ppm. The response and recovery times are 20 s and 41 s, respectively, both of which are almost 10 times shorter than that of bare RGO or SnO2 for NH3 gas detection. The excellent sensing property is discussed here, and is ascribed to the synergistic effect of the Au@SnO2 and the RGO/SnO2 heterostructure. This work provides a reliable strategy for room temperature gas sensors.
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