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Flexible reduced graphene oxide/polyacrylonitrile dielectric nanocomposite films for high-temperature electronics applications

journal contribution
posted on 07.07.2020, 15:49 by Yaotian Su, Wenqing Zhang, Jinle Lan, Gang Sui, Hongtao Zhang, Xiaoping Yang
Polymer dielectrics possess excellent flexibility compared with inorganic ceramic materials. However, the relatively low dielectric constant and working temperature significantly constrain their widespread application. Here, we report a low-cost facile strategy to develop flexible polymer-based composite films with high dielectric constant over a broad temperature. Polyacrylonitrile (PAN) nanofiber mats containing graphene oxide (GO) with core–shell microstructure were first prepared via coaxial electrospinning and then hot-pressed into dense composite films. It was revealed that hot-pressing assisted by a stretching force under appropriate temperature and pressure can generate local conformational changes of PAN, leading to the formation of an electroactive phase with increased dielectric constant. Meanwhile, the GO transformed into reduced graphene oxide (rGO) under heat reduction, serving as conductive nanofillers to further promote the increase of dielectric constant. Consequently, the optimized rGO/PAN composites displayed thermally stable dielectric properties with a high dielectric constant (ε′ = 23, 80 °C; ε′ = 40, 150 °C) and low loss (tan δ = 0.13, 80 °C; tan δ = 0.55, 150 °C) over a broad temperature range. This work offers an efficient method for the synthesis of flexible composite dielectric films that hold great potential in high-temperature electronic applications.

Funding

National Natural Science Foundation of China (No. U1664251 and No. 51873011).

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

ACS Applied Nano Materials

Volume

3

Issue

7

Pages

7005 - 7015

Publisher

American Chemical Society (ACS)

Version

AM (Accepted Manuscript)

Rights holder

© American Chemical Society

Publisher statement

This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Nano Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acsanm.0c01328.

Acceptance date

22/06/2020

Publication date

2020-06-22

Copyright date

2020

ISSN

2574-0970

eISSN

2574-0970

Language

en

Depositor

Dr Hongtao Zhang. Deposit date: 7 July 2020

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