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Thermal and light-induced electrical properties in nanocomposites of reduced graphene oxide and silver nanoparticles

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Abstract

We present synthesis of nanocomposites of silver nanoparticles with reduced graphene oxide (Ag–rGO) using one-step, one-pot method where polyvinylpyrrolidone and ethylene glycol are, respectively, utilized as capping and reducing agents. The average particle size of Ag NP reduces by 16-folds when the composite is formed with rGO. We have examined the anharmonicity, thermal expansion, and thermal conductivities in rGO and Ag–rGO, while evaluating their crystallite sizes and defect densities using temperature-dependent Raman spectroscopy. The thermal conductivity of rGO and Ag–rGO at \(\sim\) 300 K have been found to be 2.86 ± 0.09 Wm\(^{-1}\) K\(^{-1}\) and 1.69 ± 0.06 Wm\(^{-1}\) K\(^{-1}\) , respectively. Owing to increase in defects in Ag–rGO, their thermal conductivity has been found to be smaller than that of rGO. In addition, I–V hysteresis loops are obtained for rGO and Ag–rGO and are used to explain variation in space charges and electrical resistances in the presence and absence of plasmonic excitation. In rGO, the electrical resistance remains nearly constant irrespective of the illumination, whereas in Ag–rGO a significant drop in the resistance upon illumination at 532 nm is observed. The increase in current is ascribed to plasmon-mediated charge transfer from nanoparticles to rGO surface.

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Acknowledgements

AT thankfully acknowledges DST-SERB, Government of India (File No. ECR/2018/000212) and Seed Grant under the IoE scheme, BHU, Varanasi for financial support. APP thanks National Academy of Sciences India (NASI) for award of NASI Sr Scientist Platinum Jubilee Fellowship and NA thanks NASI for RA in the same project. Department of Physics, Sikkim University thankfully acknowledge the financial support from DST-FIST.

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  1. Department of Physics, Sikkim University, Tadong, Gangtok, 737102, Sikkim, India

    Sweta Gurung & Ajay Tripathi

  2. School of Physics, University of Hyderabad, Gachibowli, Hyderabad, 500046, Telangana, India

    Nimmala Arun & Anand P. Pathak

  3. Department of Physics, Malaviya National Institute of Technology, JLN Marg, Jaipur, 302017, Rajasthan, India

    Srinivasa Rao Nelamarri

  4. Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, 221005, Uttar Pradesh, India

    Archana Tiwari

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Gurung, S., Arun, N., Pathak, A.P. et al. Thermal and light-induced electrical properties in nanocomposites of reduced graphene oxide and silver nanoparticles. J Mater Sci: Mater Electron 34, 1108 (2023). https://doi.org/10.1007/s10854-023-10481-z

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