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AC characterization of three-dimensional reduced graphene oxide/molybdenum disulfide nanorose hybrids for ethanol vapor detection
Mirmotallebi, M ; Sharif University of Technology | 2020
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- Type of Document: Article
- DOI: 10.1016/j.apsusc.2020.146346
- Publisher: Elsevier B. V , 2020
- Abstract:
- A novel AC impedance study on three-dimensional hybrid structures of graphene sheets/MoS2 nanorose (GMS) toward ethanol vapor detection is presented in this work. These defective 3D hybrid porous structures are sensitive to the presence of different gases as a result of charge transfer with gas species, as well as a change in the effective capacitance of the system. The sensing behavior of the samples is investigated throughout time-dependent impedance measurement and electrochemical impedance spectroscopy (EIS). The sensor response is estimated at about 20% to 10 ppm ethanol vapor, with the response and recovery times about 3.2 s and 0.8 s, respectively. Sensing mechanism proposed to describe the EIS impedance spectra involves three different procedures: charge transfer, double layer formation and diffusion process. Moreover, these processes are probed using equivalent circuits modeled by the impedance spectra curves. © 2020
- Keywords:
- AC measurement ; Ethanol detection ; Reduced graphene oxide-MoS2 hybrids ; Three-dimensional structure ; Charge transfer ; Equivalent circuits ; Ethanol ; Graphene ; Solid solutions ; Sulfur compounds ; Diffusion process ; Double layer formation ; Effective capacitance ; Ethanol vapor detections ; Impedance measurement ; Impedance spectrum ; Porous structures ; Sensing mechanism ; Electrochemical impedance spectroscopy
- Source: Applied Surface Science ; Volume 520 , August , 2020
- URL: https://www.sciencedirect.com/science/article/abs/pii/S016943322031103X