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Effect of graphene nanoplatelets concentration on optical, dielectric and electrical properties of poly(2-ethyl-2-oxazoline)–polyvinylpyrrolidone–graphene nanocomposites

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Abstract

The polymer nanocomposites with good optical, dielectric and electrical properties have taken faithfulness in research due to their distinguishing benefits in electronic applications. Hence, in the present investigation, poly(2-ethyl-2-oxazoline)–polyvinylpyrrolidone–graphene nanoplatelets (PEOX–PVP–GNPs) nanocomposites were synthesized and their properties were evaluated. Field emission scanning electron microscopy micrograph images showed a uniform dispersion of GNPs within the PEOX–PVP binary matrix. X-ray diffraction analysis illustrated the increase of crystallinity of nanocomposites with increasing weight percentage of GNPs. Fourier-transform infrared spectroscopy confirmed intermolecular interaction between the PEOX–PVP matrix and the GNPs. PEOX–PVP–graphene nanocomposite shows decrease in the optical energy band gap and increase in Urbach energy with increasing GNPs concentration. PEOX–PVP–10 wt% graphene nanocomposite has the lowest band gap (= 1.2 eV) and highest Urbach energy (= 7.43 eV). Dielectric constant, dielectric loss and tangent loss of nanocomposites decrease with increasing frequency of the applied electric field. On the other hand, the AC electrical conductivity of nanocomposites is independent of frequency, at lower frequencies, and increases with increasing frequency, at higher frequencies. PEOX–PVP–10 wt% graphene nanocomposite has the higher dielectric constant (= 16), low dielectric loss (= 0.09) and low AC conductivity (= 8.47 × 10−9 S/cm) at 1 kHz. This nanocomposite having good dielectric, electrical and optical properties may find use in electronic and optoelectronic applications due to its enhanced properties.

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Acknowledgements

S. R. Manohara wish to thank the Vision Group on Science and Technology (VGST), Department of Information Technology, Biotechnology and Science and Technology, Government of Karnataka for providing financial support under Project No. KSTePS/VGST/03/CISEE/2015–2016/GRD-470. One of the author, Shubha A., is grateful to Siddaganga Institute of Technology, Tumakuru for providing research assistantship for carrying out current research work. Authors acknowledge helpful assistance of Dr. Basavaraj Angadi of Department of Physics, Bangalore University and Dr. V. Udaykumar of Department of Chemistry at this Institute for XRD and FTIR measurements, respectively. FESEM and UV–Vis DRS characterizations were performed using facilities at CeNSE, Indian Institute of Science, Bengaluru funded by Ministry of Human Resource Development (MHRD), Ministry of Electronics and Information Technology (MeitY) and Nanomission, Department of Science and Technology (DST), Government of India.

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  1. Nano-Composites and Materials Research Lab, Department of Physics, Siddaganga Institute of Technology (Affiliated to Visvesvaraya Technological University, Belgaum), Tumakuru, Karnataka, 572 103, India

    Shubha A. & S. R. Manohara

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Shubha, A., Manohara, S.R. Effect of graphene nanoplatelets concentration on optical, dielectric and electrical properties of poly(2-ethyl-2-oxazoline)–polyvinylpyrrolidone–graphene nanocomposites. J Mater Sci: Mater Electron 31, 16498–16510 (2020). https://doi.org/10.1007/s10854-020-04204-x

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