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    Reduced graphene oxide/hierarchical flower-like zinc oxide hybrid films for room temperature formaldehyde detection

    Year: 2015

    Journal: SENSORS AND ACTUATORS B-CHEMICAL, Vol. 221, p 1290-1298, 20170208

    Authors: Li, Xian; Wang, Jing; Xie, Dan; Xu, Jianlong; Dai, Ruixuan; Xiang, Lan; Zhu, Hongwei; Jiang, Yadong

    Organizations: Tsinghua Univ, Inst Microelect, TNList, Beijing 100084, Peoples R China; Tsinghua Univ, Dept Chem Engn, Beijing 100084, Peoples R China; Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Key Lab Mat Proc Technol MOE, Beijing 100084, Peoples R China; Tsinghua Univ, Ctr Nano & Micro Mech, Beijing 100084, Peoples R China; Univ Elect Sci & Technol China, Sch Optoelect Informat, Key Lab Photoelect Detect & Sensor Integrat Techn, Minist Educ, Chengdu 610054, Peoples R China

    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.