Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 291, Issue -, Pages 216-225Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.04.074
Keywords
Gas sensor; SnS2; Graphene; rGO; NO2; 2D materials
Funding
- National Nature Science Foundation of China [61304242, 61520106003]
- Program for Chang Jiang Scholars and Innovative Research Team in University [IRT_17R47]
- National High-Tech Research and Development Program of China (863 Program) [2014AA06A505]
- Application and Basic Research of Jilin Province [20130102010JC]
- STIRT-JLU [2017TD-07]
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Nitrogen dioxide (NO2) sensing is important in terms of the agriculture development and healthcare monitoring. However, relatively poor recovery kinetics at a low temperature is still a problem for NO2 sensing and remains to be solved. In this work, we combine the excellent sensing properties and gas adsorption capacity of two- dimensional (2D) fin disulfide (SnS2) hexagonal nanoflakes with the beneficial electrical properties of graphene to build high-performance NO2 sensors by a simple and low-cost method. We found that the sensors based on the quasi-2D rGO-SnS2 hybrids exhibited exclusive selectivity towards NO2. The presence of rGO in hybrids decreased optimal working temperature effectively. Sensors based on 0.8% rGO-SnS2(G-SS) show almost an order of magnitude increase in response (32) compared to pristine SnS2(3.5). Especially, the response/recovery time is 50/48 s, respectively, demonstrating the favorable response/recovery kinetics of sensors. Such significant features can be attributed to the synergistic effect of the quasi-2D G-SS hybrid and the local heterojunctions in the interface between SnS2 and rGO.
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