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Improvement of Dielectric Performance and Temperature Dependent Behavior of Polyvinylidene Fluoride composite with KTa0.5Nb0.5O3@Ag Nanoparticles Gaoru Chen, Xuan Wang, Jiaqi Lin, Wenlong Yang, Dongping Li, Weimin Ding, and Haidong Li J. Phys. Chem. C, Just Accepted Manuscript • DOI: 10.1021/acs.jpcc.7b02828 • Publication Date (Web): 22 Jun 2017 Downloaded from http://pubs.acs.org on June 23, 2017
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The Journal of Physical Chemistry
Improvement of Dielectric Performance and Temperature Dependent Behavior
of
Polyvinylidene
Fluoride
Composite
with
KTa0.5Nb0.5O3@Ag Nanoparticles
Gaoru Chen,† Xuan Wang,† Jiaqi Lin,*,†, ‡ Wenlong Yang,*,‡ Dongping Li,†,§ Weimin Ding,§ and Haidong Li‡
†
Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin, 150080, P.R. China ‡
Department of Applied Science, Harbin University of Science and Technology, Harbin 150080, P.R. China
§
College of Chemical and Environmental Engineering, Harbin University of Science and Technology, Harbin 150080, P.R. China *E-mail address:
[email protected];
[email protected] Telephone number: +86-451-8639-2428
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ABSTRACT The effects of KTN and KTN@Ag nanoparticles on dielectric behaviors and temperature-dependent dielectric mechanisms of PVDF-based composites were studied. It was found that relatively high dielectric permittivity, low loss tangent and outstanding dielectric stability were simultaneously achieved in the Nano-KTN@Ag/PVDF hybrid films. In this study, we found that the effect of interfacial polarization on permittivity of Nano-KTN@Ag/PVDF hybrid film becomes more and more significant with the increase of temperature. The calculated conductivity activation energy (EA) proved that the migration of charge carriers requires more energy to overcome the potential barrier in the Nano-KTN@Ag/PVDF hybrid films than that in the Nano-KTN/PVDF hybrid films. A complete and systematic study of the dielectric mechanism is necessary, which can be a significant guide to the preparation of dielectric materials applied in the electronics industry.
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The Journal of Physical Chemistry
■ INTRODUCTION Dielectric capacitors have been widely used in electronic devices and play a key role in the advanced electronics, hybrid electric vehicles as well as stationary power systems in the near future.1,2 In recent years, researches on high-performance dielectric capacitors mainly focus on the preparation of flexible dielectric material with high permittivity and low dielectric loss, two properties that are difficult to be obtained at the same time.3,4 Conventional ceramic dielectrics have high permittivity and low working voltages; however, they are brittle, and they have poor mechanical strength and require high temperature sintering.5 Polymers, such as polyvinylidene fluoride (PVDF), polyethylene (PE) and polypropylene (PP), are ideal materials for energy storage because of their high breakdown field, low dielectric loss, easy-to-be-processed, and low cost, but their permittivity is very low (
