Sulfur doped graphene/polystyrene nanocomposites for electromagnetic interference shielding

Faisal Shahzad, Seunggun Yu, Pradip Kumar, Jang Woo Lee, Yoon Hyun Kim, Soon Man Hong, Chong Min Koo

Research output: Contribution to journalArticle

66 Citations (Scopus)

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 (2.6at.% S), synthesized through a simple heating process of a mixture of graphene oxide and sulfur powder, revealed almost three times larger electrical conductivity (1095Sm-1) than undoped rGO (395Sm-1). The SrGO/PS nanocomposite showed not only 150% larger electrical conductivity and 50% larger complex permittivity, but also improved EMI shielding effectiveness (24.5dB) at a frequency of 18GHz than rGO/PS nanocomposite (21.4dB) at the same loading level of 7.5vol.%. 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.

Original languageEnglish
Pages (from-to)1267-1275
Number of pages9
JournalComposite Structures
Volume133
DOIs
Publication statusPublished - 2015 Dec 1
Externally publishedYes

Keywords

  • Conductivity
  • Electromagnetic interference shielding
  • Graphene
  • Permittivity
  • Sulfur doping

ASJC Scopus subject areas

  • Ceramics and Composites
  • Civil and Structural Engineering

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