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나노입자 연구단
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Factors affecting the exfoliation of graphite intercalation compounds for graphene synthesis

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Title
Factors affecting the exfoliation of graphite intercalation compounds for graphene synthesis
Author(s)
Gabin Yoon; Seo D.-H.; Kyojin Ku; Kim J.; Jeon S.; Kisuk Kang
Publication Date
2015-03
Journal
CHEMISTRY OF MATERIALS, v.27, no.6, pp.2067 - 2073
Publisher
AMER CHEMICAL SOC
Abstract
We investigate the mechanism of the intercalation-aided exfoliation of graphite using van der Waals force-corrected density functional theory (DFT) calculations. From a comparative study on various intercalation systems, we find that, depending on the intercalant species, the exfoliation energies vary significantly, not only due to the size of intercalants but also due to interactions with the host graphite. While it is generally perceived that an expanded interlayer distance with intercalants weakens the binding between graphene layers, as the van der Waals forces decrease, the calculations reveal that the intercalation of electronegative or electropositive intercalants (e.g., Li, K, F, Cl, and Br) result in a 1.5-5-fold higher exfoliation energy than pristine graphite due to additional binding forces from charge transfer between intercalants and graphene layers. Furthermore, we demonstrate that this additional binding force could be manipulated with cointercalation or neutral intercalants, which hints at effective exfoliation strategies with graphite intercalation compounds. This theoretical study broadens our understanding of the mechanism underlying graphite exfoliation and will facilitate development of more effective exfoliation strategies for other related layered materials. © 2015 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/2079
ISSN
0897-4756
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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