Abstract
Poly (2-ethyl-2-oxazoline)-poly (vinylpyrrolidone)-titanium dioxide [PEOX–PVP–TiO2] hybrid nanocomposites were obtained by the reinforcement of TiO2 nanoparticles to pure PEOX–PVP blend by a solution intercalation method. FESEM images indicate good dispersion of TiO2 nanoparticles in PEOX–PVP matrix. The crystallite size and crystallinity of nanocomposites were evaluated from XRD spectra. The peaks shift in FTIR spectra indicates the intermolecular interaction between PEOX-PVP blend and TiO2 nanoparticles. Optical characteristics such as energy band gap, Urbach energy and Fermi energy were calculated. The energy band gap and Fermi energy decrease, whereas Urbach energy increases with increase in TiO2 weight percentage. The dielectric constant and dielectric loss of PEOX–PVP–TiO2 nanocomposites decrease with increase in frequency of the electric field, whereas the AC electrical conductivity increases with increase in frequency. The dielectric loss and dielectric constant values of the nanocomposites were found to increase with increasing TiO2 concentration. Relaxation time, obtained from Cole–Cole plot, decreases with increasing TiO2 concentration. PEOX–PVP–15 wt% TiO2 nanocomposite having enhanced optical, dielectric and electrical properties can be used for device applications.
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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 & Technology, Government of Karnataka, for providing financial support under project no. KSTePS/VGST/03/CISEE/2015-2016/GRD-470. One of the authors, 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. V. Udaykumar and Dr. H. M. Suresh Kumar of the Departments of Chemistry and Physics at this institute for FTIR and UV-Vis measurements, respectively. FESEM characterization was 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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Shubha, A., Manohara, S.R. & Angadi, B. Influence of TiO2 nanoparticles on structural, optical, dielectric and electrical properties of bio-compatible PEOX–PVP–TiO2 nanocomposites. Polym. Bull. 79, 7117–7135 (2022). https://doi.org/10.1007/s00289-021-03838-z
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DOI: https://doi.org/10.1007/s00289-021-03838-z