Sulfur doped graphene/polystyrene nanocomposites for electromagnetic interference shielding

Title
Sulfur doped graphene/polystyrene nanocomposites for electromagnetic interference shielding
Authors
샤자드 파이잘Seunggun YuPradip KumarJang-Woo LeeYoon-Hyun Kim홍순만구종민
Keywords
Graphene; Composite; EMI shielding; Sulfur doping
Issue Date
2015-12
Publisher
Composite structures
Citation
VOL 133, 1267-1275
Abstract
In this paper, for the first time, we present a simple and straightforward method to improve not only electrical conductivity and complex permittivity but also electromagnetic interference (EMI) shielding effectiveness of reduced graphene oxide (rGO)/polystyrene (PS) nanocomposites through sulfur doping. Sulfur-doped reduced graphene oxide with thiophene-like structure (2.6 at.% S), synthesized through a simple heating process of a mixture of graphene oxide and sulfur powder, revealed almost three times larger electrical conductivity (1095 S m−1) than undoped rGO (395 S m−1). The SrGO/PS nanocomposite showed not only 150% larger electrical conductivity and 50% larger complex permittivity, but also improved EMI shielding effectiveness (24.5 dB) at a frequency of 18 GHz than rGO/PS nanocomposite (21.4 dB) at the same loading level of 7.5 vol.%. Considering the simplicity and effectiveness of process, sulfur doping of graphene is expected to be used as a versatile method to improve EMI shielding efficiency of graphene/polymer nanocomposites.
URI
http://pubs.kist.re.kr/handle/201004/50195
ISSN
02638223
Appears in Collections:
KIST Publication > Article
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