Electrical and optical percolations in PMMA/GNP composite films |
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| Authors: | Ertan Arda Ömer Bahad?r Mergen Önder Pekcan |
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| Institution: | 1. Department of Physics, Faculty of Science, Trakya University, Edirne, Turkey;2. Program of Medical Imaging Techniques, Vocational School of Healthcare Services, Dokuz Eylul University, Izmir, Turkey;3. Department of Bioinformatics and Genetics, Faculty of Engineering and Natural Sciences, Kadir Has University, Istanbul, Turkey |
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| Abstract: | Effects of graphene nanoplatelet (GNP) addition on the electrical conductivity and optical absorbance of poly(methyl methacrylate)/graphene nanoplatelet (PMMA/GNP) composite films were studied. Optical absorbance and two point probe resistivity techniques were used to determine the variations of the optical and electrical properties of the composites, respectively. Absorbance intensity, A, and surface resistivity, Rs, of the composite films were monitored as a function of GNP mass fraction (M) at room temperature. Absorbance intensity values of the composites were increased and surface resistivity values were decreased by increasing the content of GNP in the composite. Electrical and optical percolation thresholds of composite films were determined as Mσ = 27.5 wt.% and Mop = 26.6 wt.%, respectively. The conductivity and the optical results were attributed to the classical and site percolation theories, respectively. Optical (βop) and electrical (βσ) critical exponents were calculated as 0.40 and 1.71, respectively. |
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| Keywords: | Poly(methyl methacrylate) graphene nanoplatelet (GNP) percolation critical exponents conductivity |
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