Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 241, Issue -, Pages 904-914Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.11.023
Keywords
Reduced graphene oxide; alpha-Fe2O3; Composites; Gas sensor; Acetone vapor
Funding
- National Nature Science Foundation of China [61134010, 61304242, 61327804, 61377058, 61474057]
- Program for Chang Jiang Scholars and Innovative Research Team in University [IRT13018]
- National High-Tech Research and Development Program of China (863 Program) [2013AA030902, 2014AA06A505]
- China Postdoctoral Science Foundation [2013M530979]
- Science and Technology Development Program of Jilin Province [20150520091JH]
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A low-cost and environmentally friendly hydrothermal method was utilized to prepare reduced graphene oxide (rGO) and synthesize rGO/alpha-Fe2O3 composites with different rGO contents. The chemical composition and morphological essence of the as-prepared samples were characterized through multiple techniques. The results indicated that the uniform alpha-Fe2O3 cubes adhered uniformly on both sides of the crumpled and rippled rGO sheets. In addition, a series of resistive-type gas sensors were fabricated based on the as-prepared rGO/alpha-Fe2O3 composites as well as pure alpha-Fe2O3 to compare their gas-sensing properties toward acetone vapor. The composite containing 1.0 wt% rGO exhibited an enhanced gas response and its response time was shortened to 2 s. We attribute it to the extension of electron depletion layers, the change of charge carrier concentration, which are caused by the formation of local p-n heterojunctions when introducing rGO. (C) 2016 Elsevier B.V. All rights reserved.
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