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학술지 High-yield Graphene Exfoliation Using Sodium Dodecyl Sulfate Accompanied by Alcohols as Surface-Tension-Reducing Agents in Aqueous Solution
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저자
연창봉, 윤선진, 이규성, 임정욱
발행일
201503
출처
Carbon, v.83, pp.136-143
ISSN
0008-6223
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.carbon.2014.11.035
협약과제
13MB2100, 유연성 철강소재기판상에서 효율13%를 갖는 Si/SiGe 탠덤 박막태양전지개발, 윤선진
초록
The exfoliation of graphite was investigated in aqueous solutions containing sodium dodecyl sulfate (SDS) as a surfactant. The exfoliation was greatly enhanced near the surface aggregation concentration (SAC) of SDS, 2.6 mM, and then decreased for higher SDS contents. However, the flakes exfoliated near the SAC were graphite, whereas graphene was obtained above the critical micelle concentration (CMC). The effect of the use of alcohols as surface-tension-reducing agents (STRAs) on the exfoliation was then investigated. With ethyl alcohol, a dispersion of 2.1 mg ml-1 graphene was achieved from 2.6 mM SDS after only 1 h of sonication, whereas a dispersion of 0.2 mg ml-1 was obtained above the CMC in the absence of STRAs. The results demonstrate that the SDS content near the SAC is highly beneficial for exfoliation as long as the surface tension is maintained near 41.0 mN ml-1. This finding supports the notion that the structure of the adsorbed SDS, depending on its concentration, strongly affects the exfoliation of graphite into graphene.
KSP 제안 키워드
1 H, Aqueous solution, Ethyl alcohol, High yield, Reducing agent, Sodium dodecyl sulfate, Surface aggregation, Surface tension(ST), critical micelle concentration (cmc), graphene exfoliation