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- Title
Nitrogen Dioxide-Sensing Properties at Room Temperature of Metal Oxide-Modified Graphene Composite via One-Step Hydrothermal Method.
- Authors
Zhang, Dongzhi; Liu, Jingjing; Xia, Bokai
- Abstract
A metal oxide/graphene composite film-based sensor toward room-temperature detection of ppm-level nitrogen dioxide (NO) gas has been demonstrated. The sensor prototype was constructed on a PCB substrate with microelectrodes, and a tin oxide-reduced graphene oxide (SnO-rGO) composite as sensing film was prepared by one-step hydrothermal synthesis of tin tetrachloride pentahydrate solution in the presence of graphene oxide (GO). The SnO-rGO hybrid composite was examined by scanning electron microscope and x-ray diffraction (XRD). The gas sensing properties of the SnO-rGO composite were investigated at room temperature by exposing it to a wide concentration ranging from 1 ppm to 2000 ppm toward NO gas. The experiment results showed that the sensor exhibited a high response, superior selectivity, good repeatability, rapid response/recovery characteristics and low detection limit of 1 ppm, which exceeded that of a pure rGO sensor. The gas sensing mechanisms of the proposed sensor toward NO were possibly attributed to the nano-hybrid structures and n- p heterojunctions created at the interface of the SnO nanocrystals and rGO nanosheets.
- Subjects
NITROGEN dioxide; GRAPHENE; COMPOSITE materials; METALLIC oxides; HYDROTHERMAL synthesis
- Publication
Journal of Electronic Materials, 2016, Vol 45, Issue 8, p4324
- ISSN
0361-5235
- Publication type
Article
- DOI
10.1007/s11664-016-4600-8