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Thermal stability and dielectric relaxation behavior of in situ prepared poly(vinyl alcohol) (PVA)-reduced graphene oxide (RGO) composites

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Abstract

Poly(vinyl alcohol) (PVA)-reduced graphene oxide (RGO) composite films have been prepared via in situ reduction of graphene oxide (GO) inside PVA matrix. In order to study microstructure and morphology of prepared PVA-RGO composite films, transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) spectroscopy, UV-Visible absorption spectroscopy, X-ray diffraction (XRD) technique, and Raman spectroscopy were utilized. Thermogravimetric analysis (TGA) depicts the increase in thermal stability of PVA with increasing loading of RGO. The dielectric properties of composites were explored in frequency range 100 Hz–2.5 MHz which depicts increase in dielectric permittivity and ac conductivity of composite films with increasing RGO loading. The dielectric relaxation behavior and dispersion parameters of composite films were analyzed using Cole-Cole plots using a MATLAB program based on the Havrilak-Negami (HN) model.

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Acknowledgements

Authors are highly grateful to the UGC-SAP (DRS) and SERB-DST Project for funding Department of Physics, K. U. Kurukshetra for procuring the instrumentation facilities in the Department. Authors are also thankful to the Centre for Advance Research in Material Science, K.U.K. funded by RUSA 2.0 Grant from MHRD, New Delhi, India. The project funders were not directly involved in the writing of this article. Further, authors are grateful to Dr. N.P. Lalla and Dr. Mukul Gupta of UGC-DAE, CSR, Indore, for their help and valuable suggestions for TEM and XRD measurements. Authors are thankful to Prof. Vinay Gupta of Dept. of Physics and Astrophysics, Delhi University, New Delhi, for their help in Raman measurements. Authors are highly thankful to Dr. P. K. Diwan of University Institute Engineering and Technology, Kurukshetra, for help and precious guidance in TGA measurements.

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  1. Department of Physics, Goverment PG College, Hisar, 125001, India

    Heena Wadhwa

  2. Department of Physics, Kurukshetra University, Kurukshetra, Haryana, 136119, India

    Geeta Kandhol, Suman Mahendia & Shyam Kumar

  3. UGC-DAE Consortium for Scientific Research, Indore, Madhya Pradesh, 452017, India

    Uday P. Deshpande

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Wadhwa, H., Kandhol, G., Deshpande, U.P. et al. Thermal stability and dielectric relaxation behavior of in situ prepared poly(vinyl alcohol) (PVA)-reduced graphene oxide (RGO) composites. Colloid Polym Sci 298, 1319–1333 (2020). https://doi.org/10.1007/s00396-020-04718-0

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