期刊
COMPOSITE STRUCTURES
卷 133, 期 -, 页码 1267-1275出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2015.07.036
关键词
Graphene; Sulfur doping; Electromagnetic interference shielding; Permittivity; Conductivity
资金
- Graphene Part & Material Development Program
- Fundamental R&D Program for Core Technology of Materials
- Industrial Strategic Technology Development Program - Ministry of Trade, Industry and Energy, Republic of Korea
- Korea Institute of Science and Technology
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. (C) 2015 Elsevier Ltd. All rights reserved.
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