Sustainable production of reduced graphene oxide using elemental sulfur for multifunctional composites

Title
Sustainable production of reduced graphene oxide using elemental sulfur for multifunctional composites
Authors
구본철유남호유재상장세규남기호정하나김경민김서균이헌상문봉진
Keywords
sulfur; composites; polyimide; graphene
Issue Date
2019-11
Publisher
Composites. Part B, Engineering
Citation
VOL 176-107236-10
Abstract
We herein report on a green, facile, and sustainable production of sulfur-doped reduced graphene oxide (S-RGO) and their use in mechanically strong gas barrier polymers. S-RGO was successfully obtained by directly utilizing elemental sulfur in the absence of any organic solvent or catalyst. This method suggests that the sulfur treatment of GO causes the insertion of a variety of sulfur forms such as thiol, thioether, sulfoxide, sulfone, and sulfonic acid at the platelet edges or surfaces. It also restores graphitic networks on the basal planes, enabling easy exfoliation in liquid phases. The resultant S-RGO is highly dispersible in organic solvents and exhibits a high C/O ratio (13.2), excellent electrical conductivity (179  S  cm− 1), and a high Hg removal capacity. The molecular dynamics (MD) simulation supports the discussion on the interfacial mechanics for the solvent-exfoliation of S-RGO. The S-RGO can significantly improve the tensile strength (255  MPa) and Young's modulus (6.2  GPa) of the host polyimide, (PI) even with a 0.5  wt% filler loading. Furthermore, loading S-RGO as a filler in PI films can lead to an exceptional oxygen gas barrier performance, resulting in an approximately 95% reduction (at 3  wt%) compared with that of a pristine PI film. This strategy provides a new, environmentally friendly, and cost-effective reduction methodology for synthesizing high-quality and multifunctional RGOs and their nanocomposites.
URI
http://pubs.kist.re.kr/handle/201004/70359
ISSN
1359-8368
Appears in Collections:
KIST Publication > Article
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