Issue 2, 2020

Flexible PVDF/carbon materials/Ni composite films maintaining strong electromagnetic wave shielding under cyclic microwave irradiation

Abstract

In the current work, multiwalled carbon nanotubes (MWCNTs), graphene nanoplatelets (GnPs) and nickel (Ni chains or flowers) were evenly dispersed in poly(vinylidene fluoride) (PVDF) matrices to fabricate PVDF/MWCNT/GnPs/Ni (chain or flower) composite flexible films. We then concentrated on the electrical conductivity and electromagnetic interference (EMI) shielding properties of the composite films. By increasing the Ni (chain or flower) content, the EMI shielding properties of the composite films were improved due to increased electrical conductivity. Furthermore, at the same Ni concentration, the composite film containing Ni chains displayed inferior electrical conductivity and EMI shielding properties compared with the composite film possessing Ni flowers, which resulted from the blocking path of the conductive network caused by the bigger size of Ni chains. When the composite films were exposed to cyclic microwave irradiation, the electrical conductivity and EMI shielding properties decreased due to the oxidation of Ni and separation of conductive fillers caused by flowing melting PVDF polymers from heating energy. Moreover, the decreasing tendency of the composite film containing Ni flowers was quicker than that of the composite film with Ni chains. The reason was that Ni flowers of smaller size were easily oxidized and possessed stronger microwave absorption ability. The occurrence of nickel oxidation on the surface of Ni could prevent further oxidation, which rendered the final composite films with stable high EMI shielding properties irrespective of how many times cyclic microwave irradiation was performed. These PVDF flexible films have been proven to be promising EMI shielding devices with quick heat dissipation used at a relatively high temperature under repeated harsh microwave irradiation.

Graphical abstract: Flexible PVDF/carbon materials/Ni composite films maintaining strong electromagnetic wave shielding under cyclic microwave irradiation

Supplementary files

Article information

Article type
Paper
Submitted
06 ⴽⵜⵓ 2019
Accepted
03 ⵏⵓⵡ 2019
First published
04 ⵏⵓⵡ 2019

J. Mater. Chem. C, 2020,8, 500-509

Flexible PVDF/carbon materials/Ni composite films maintaining strong electromagnetic wave shielding under cyclic microwave irradiation

B. Zhao, S. Zeng, X. Li, X. Guo, Z. Bai, B. Fan and R. Zhang, J. Mater. Chem. C, 2020, 8, 500 DOI: 10.1039/C9TC05462F

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements