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Lee, Geunsik
Electronic Structure and Transport in Condensed Materials
Research Interests
  • open quantum system, non-equilibrium electron transport
  • electron correlation, dynamical mean field theory
  • 2D materials, metal complexes

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Substrate-Induced Solvent Intercalation for Stable Graphene Doping

Cited 17 times inthomson ciCited 9 times inthomson ci
Title
Substrate-Induced Solvent Intercalation for Stable Graphene Doping
Author
Kim, Hyun HoYang, Jae WonJo, Sae ByeokKang, BoseokLee, Seong KyuBong, HyojinLee, GeunsikKim, Kwang S.Cho, Kilwon
Issue Date
2013-02
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v.7, no.2, pp.1155 - 1162
Abstract
Here, we report a substrate-induced intercalation phenomenon of an organic solvent at the interface between monolayer graphene and a target substrate. A simple dipping of the transferred chemical vapor deposition (CVD)-grown graphene on the SiO2 substrate into chloroform (CHCl3, CF), a common organic solvent, induces a spontaneous formation of CF clusters beneath the basal plane of the graphene as well as inside the wrinkles. The microscopic and spectroscopic observations showed the doping behavior of monolayer graphene, which indicates the adsorption of CF to monolayer graphene. Interestingly, the intercalated organic solvent showed remarkable stability for over 40 days under ambient conditions. To reveal the underlying mechanism of the stable solvent intercalation, desorption energy of CF molecules at the graphene/substrate interface was measured using Arrhenius plots of the conductance change upon time and temperature. Two stages of solvent intercalations with high desorption energies (70 and 370 meV) were observed along with the consecutive shrinkage of the solvent clusters at the basal plane and the wrinkles, respectively. Moreover, the theoretical calculation based on density functional theory (DFT) also shows the strong intercalation energy of CF between monolayer graphene and the SiO2 substrate, which results from the stabilization of the graphene-SiO2 interactions. Furthermore, the thermal response of the conductance could be utilized to maintain a certain degree of p-doping of monolayer graphene, which provides the facile, sustainable, and controllable large-area doping method of graphene for future generation of printed flexible electronics.
URI
https://scholarworks.unist.ac.kr/handle/201301/5570
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84874414503
DOI
10.1021/nn306012p
ISSN
1936-0851
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CHM_Journal Papers
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