Sustainable production of reduced graphene oxide using elemental sulfur for multifunctional composites
- Sustainable production of reduced graphene oxide using elemental sulfur for multifunctional composites
- 구본철; 유남호; 유재상; 장세규; 남기호; 정하나; 김경민; 김서균; 이헌상; 문봉진
- sulfur; composites; polyimide; graphene
- Issue Date
- Composites. Part B, Engineering
- VOL 176-107236-10
- 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.
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