期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 762, 期 -, 页码 8-15出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.05.177
关键词
Reduced graphene oxide; Pt-activated SnO2; Gas sensor; Mechanism
资金
- Startup Funding of Distinguished Professorship of 1000 Talent program [31270086963030]
- Taishan Scholar Program [11370085961006]
- Shandong Provincial Science and Technology Major Project [2015ZDZX11008, 2015GGE27286, 2016GGX104001]
- National Science Foundation of Shandong Province [ZR2017BEM049]
- Fundamental Research Funds of Shandong University at Shandong University [2016JC005, 2015JC033]
- China Postdoctoral Science Foundation [2017M612265]
Methanol gas sensors with excellent performances are in great demand to monitor the industrial manufacture and many household products. We have synthesized Pt-activated SnO2 nanoparticles partly wrapped by reduced graphene oxide (RGO) for high performance methanol gas sensor application. The X-ray diffraction (XRD) and transmission electron microscopy (TEM) results indicated that the platinum element is present in two types, including metal (Pt) and tetravalent metal oxide (PtO2) in the Pt-activated SnO2 clusters. The SnO2 nanoparticles with an average size of about 10 nm are in form of cluster type and there are abundant random wormhole-like pores throughout each cluster. The gas responses of the pristine SnO2 gas sensor, Pt-activated SnO2 gas sensor and the RGO-assisted sensors toward 40 ppm methanol at the relatively low operating temperatures (110 degrees C) were 7.8, 38.5 and 60.1, respectively. And the sensor exhibited shorter response time with only 6 s. The excellent gas-sensing properties are mainly attributed to the improved electronic interaction and the reduced potential barrier between RGO and Pt/SnO2. (C) 2018 Elsevier B.V. All rights reserved.
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