Vapor sensing and interface properties of reduced graphene oxide–poly(methyl methacrylate) nanocomposite
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Synthesized reduced graphene oxide–poly(methyl methacrylate) (RGO–PMMA) nanocomposites were characterized by differential scanning calorimetry, thermogravimetric analysis, and probed for volatile organic compounds (VOC) sensing. A molecular dynamics simulation is performed to investigate the interaction between PMMA and a graphene surface. The condensed-phase optimized molecular potentials for atomistic simulation studies (COMPASS), polymer consistent force-field (PCFF) and consistent valence force-field (CVFF) are used to describe the interaction of the graphene–PMMA. None of the three simulated force fields COMPASS, PCFF, and CVFF exhibits a distinctive behaviour of interaction between graphene and PMMA, but CVFF predicts a higher interaction energy in comparison with the simulated force fields COMPASS and PCFF. Experimentally, the selective response for different VOC has been analysed and the highest response together with the fastest recovery is obtained for tetrahydrofuran. A model is introduced explaining observed features.
Zabiholah Zabihi is grateful to Department of Analytical Chemistry at Universidad Complutense de Madrid for hospitality during a nine month visit, where experimental part of this work was carried out. He is grateful to the Iran Ministry of Science, Research, and Technology for a fellowship in support of this visit. P.E.D.S.R. and R.V. acknowledges Spanish Ministry of Economy and Competitiveness (Grants CTQ2014-58989-P and CTQ2015-71936-REDT).
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