Issue 80, 2015

A comparative study of structure and electromagnetic interference shielding performance for silver nanostructure hybrid polyimide foams

Abstract

Silver nanofillers of three different shapes were synthesized: silver nanospheres (AgNSs), silver nanowires (AgNWs) and silver nanowires–silver nanoplatelets (AgNWPs). Ultra-lightweight polyimide (PI) composite foams filled with these three silver nanofillers were fabricated by a facile and effective one-pot liquid foaming process, respectively. Their microstructure, electromagnetic interference (EMI) shielding effectiveness (SE) and shielding mechanisms were investigated. It was found that, at the same nanofiller loading, the EMI SE of the composite foams decreased in the following order: AgNWPs > AgNWs > AgNSs. AgNWPs/PI composite foams exhibited the highest EMI SE owing to the denser 3D conductive network of AgNWPs compared to AgNWs and AgNSs, in which the seamlessly interconnected AgNWPs network provided fast electron transport channels inside foams. Maximum specific EMI SE values of 1208 dB g−1 cm3 at 200 MHz, 650 dB g−1 cm3 at 600 MHz, and 488 dB g−1 cm3 in the frequency ranges of 800–1500 MHz, 216–249 dB g−1 cm3 at 8–12 GHz were achieved in the composite foams at 4.5 wt% AgNWPs loading, which far surpass the best values of other composite materials. The reflections of interconnected AgNWPs networks inside the foams combined with absorptions resulting from the multiple reflections at interfaces inside the foams contributed to the shielding effect. This suggests that our AgNWPs/PI composite foams have excellent potential as high-performance EMI shielding materials against electromagnetic interference pollution in applications that need lightweight.

Graphical abstract: A comparative study of structure and electromagnetic interference shielding performance for silver nanostructure hybrid polyimide foams

Article information

Article type
Paper
Submitted
20 maí 2015
Accepted
24 júl. 2015
First published
24 júl. 2015

RSC Adv., 2015,5, 65283-65296

Author version available

A comparative study of structure and electromagnetic interference shielding performance for silver nanostructure hybrid polyimide foams

J. Ma, K. Wang and M. Zhan, RSC Adv., 2015, 5, 65283 DOI: 10.1039/C5RA09507G

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