Shahzad, Faisal Yu, Seunggun Kumar, Pradip Lee, Jang-Woo Kim, Yoon-Hyun Hong, Soon Man Koo, Chong Min 2024-01-20T05:31:20Z 2024-01-20T05:31:20Z 2022-01-10 2015-12-01 0263-8223 https://pubs.kist.re.kr/handle/201004/124638 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. English ELSEVIER SCI LTD REDUCED GRAPHENE OXIDE CARBON NANOTUBE COMPOSITES WAVE ABSORPTION PROPERTIES OXYGEN REDUCTION REACTIONS HIGHLY EFFICIENT ELECTRICAL-CONDUCTIVITY CHEMICAL-REDUCTION THIN-FILMS TRANSPARENT LIGHTWEIGHT Sulfur doped graphene/polystyrene nanocomposites for electromagnetic interference shielding Article 10.1016/j.compstruct.2015.07.036 1 COMPOSITE STRUCTURES, v.133, pp.1267 - 1275 COMPOSITE STRUCTURES 133 1267 1275 scie scopus 000363069100119 2-s2.0-84940108687 Mechanics Materials Science, Composites Mechanics Materials Science Article REDUCED GRAPHENE OXIDE CARBON NANOTUBE COMPOSITES WAVE ABSORPTION PROPERTIES OXYGEN REDUCTION REACTIONS HIGHLY EFFICIENT ELECTRICAL-CONDUCTIVITY CHEMICAL-REDUCTION THIN-FILMS TRANSPARENT LIGHTWEIGHT Graphene Sulfur doping Electromagnetic interference shielding Permittivity Conductivity