Effect of CeO2 nanoparticles on dielectric properties of PVB/CeO2 polymer nanodielectrics: a positron lifetime study

• Published in: Journal of materials science. Materials in electronics Vol. 33; no. 2; pp. 1063 - 1077
• Main Authors: Raghavendra, M., Jagadish, K., Srikantaswamy, S., Pradeep, T. M., Gnana Prakash, A. P., Ravikumar, H. B.
• Format: Journal Article
• Language: English
• Published: New York Springer US 2022; Springer Nature B.V
• Subjects: Cables; Cerium oxides; Characterization and Evaluation of Materials; Chemistry and Materials Science; Dielectric properties; Dipoles; Ionic mobility; Materials Science; Nanoparticles; Optical and Electronic Materials; Permittivity; Photon correlation spectroscopy; Polymers; Polystyrene resins; Polyvinyl acetal resins; Polyvinyl butyral
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-021-07379-z

To produce a polymer nanodielectric material with low dielectric constant for high speed communication network cables, polymer nanodielectrics of Polyvinyl butyral (PVB) with (0.2, 0.4, 0.6, 0.8, and 1 wt%) of CeO 2 nanoparticles are prepared. Cerium dioxide (CeO 2 ) nanoparticles were synthesized by hydrothermal technique. The average size of CeO 2 nanoparticles determined by Dynamic Light Scattering studies is 60 nm. The dependence of free volume and crystallinity on dielectric properties of PVB/CeO 2 polymer nanodielectrics is explored. The positron lifetime parameters viz., o-Ps lifetime ( τ 3 ) and free volume size ( V f ) show minimum value for 1.0 wt% of CeO 2 nanoparticles loading. The reduced free volume is attributed to the increased chemical interaction between CeO 2 nanoparticles and PVB side chain. The AC conductivity and dielectric constant of PVB/CeO 2 polymer nanodielectrics are also decreased for 1.0 wt% of CeO 2 nanoparticle loading. The reduced free volume restricts the ionic mobility of CeO 2 nanoparticles and impedes dipoles mobility.