Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 221, Issue -, Pages 1290-1298Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.07.102
Keywords
Gas sensor; Reduced Graphene Oxide (rGO); Hierarchical flower-like ZnO structure; Formaldehyde (HCHO)
Funding
- National Natural Science Foundation of China [61401251, 51372130, 51372133]
- Open Foundation of Key Laboratory of Photoelectric Detection and Sensor Integration Technology of Ministry of Education [KFJJ201301]
- Tsinghua National Laboratory for Information Science and Technology (TNList) Cross-discipline Foundation
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We report a potential method to improve the room temperature formaldehyde (HCHO) gas-sensing properties of the layer-by-layer self-assembled reduced graphene oxide (rGO) film by introducing a special hierarchical flower-like zinc oxide (ZnO) structure. Hierarchical flower-like ZnO structures are developed by one step hydrothermal synthesis methods. Both rGO and rGO/ZnO sensitive films respond at once when exposed to HCHO at room temperature. The gas-sensing responses to 2-10 ppm formaldehyde are enhanced in rGO/ZnO hybrid films compared with pure rGO films. The enhanced formaldehyde gas-sensing responses are attributed to the more adsorption sites on the surface of the rGO/ZnO hybrid films and the reduced barrier height for the electron transfer during the gas sensing process. (C) 2015 Elsevier B.V. All rights reserved.
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