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나노 구조 물리 연구단
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Flexible electromagnetic interference shields made of silver flakes, carbon nanotubes and nitrile butadiene rubber

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Title
Flexible electromagnetic interference shields made of silver flakes, carbon nanotubes and nitrile butadiene rubber
Author(s)
Kwon, Seoyoung; Rujun Ma; Kim, Uikyum; Choi, Hyouk Ryeol; Seunghyun Baik
Publication Date
2014-03
Journal
CARBON, v.68, no., pp.118 - 124
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
The recent advances in portable and flexible electronic devices demand integration of flexibility into future electromagnetic interference shielding materials. Here we synthesized flexible adhesive shields made of microscale silver flakes (Ag flakes), multi-walled carbon nanotubes decorated with nanoscale silver particles (nAg-MWNTs), and nitrile butadiene rubber (NBR). The addition of nAg-MWNTs into the Ag flake-NBR mixture significantly enhanced both conductivity and shielding effectiveness. Long nanotubes electrically linked microscale Ag flakes embedded in the NBR matrix, and nanoscale silver particles further improved the contact interface. There was a logarithmic relationship between the conductivity and shielding effectiveness. The dominant mechanism of electromagnetic interference shielding was reflection. The achieved maximum shielding effectiveness was about ∼75 dB at 1 GHz. The flexible adhesive shield printed on a polyimide film was wrapped around a cylindrical rod with a radius of 4 mm. The shielding effectiveness decreased about 20% after 100 wrapping cycles. The conductivity and shielding effectiveness could be adjusted by changing the Ag flake concentration. There was an excellent agreement between the theoretically predicted shielding effectiveness and the experimental data. © 2013 Elsevier Ltd. All rights reserved.
URI
https://pr.ibs.re.kr/handle/8788114/1110
ISSN
0008-6223
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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