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Tailoring Single- And Double-Sided Fluorination of Bilayer Graphene via Substrate Interactions

Authors
Son J.Ryu H.Kwon J.Huang S.Yu J.Xu J.Watanabe K.Taniguchi T.EunJi Ji이솔Shin Y.Kim J.H.KWANPYO KIMVan Der Zande A.M.Lee G.-H.
Issue Date
Jan-2021
Publisher
NLM (Medline)
Keywords
graphene; chemical functionalization; fluorination; substrate interaction; interlayer interaction
Citation
Nano letters, v.21, no.2, pp.891 - 898
Journal Title
Nano letters
Volume
21
Number
2
Start Page
891
End Page
898
URI
https://yscholarhub.yonsei.ac.kr/handle/2021.sw.yonsei/5286
DOI
10.1021/acs.nanolett.0c03237
ISSN
1530-6992
Abstract
While many technologies rely on multilayer heterostructures, most of the studies on chemical functionalization have been limited to monolayer graphene. In order to use functionalization in multilayer systems, we must first understand the interlayer interactions between functionalized and nonfunctionalized (intact) layers and how to selectively functionalize one layer at a time. Here, we demonstrate a method to fabricate single- or double-sided fluorinated bilayer graphene (FBG) by tailoring substrate interactions. Both the top and bottom surfaces of bilayer graphene on the rough silicon dioxide (SiO2) are fluorinated; meanwhile, only the top surface of graphene on hexagonal boron nitride (hBN) is fluorinated. The functionalization type affects electronic properties; double-sided FBG on SiO2 is insulating, whereas single-sided FBG on hBN maintains conducting, showing that the intact bottom layer becomes electrically decoupled from the fluorinated top insulating layer. Our results define a straightforward method to selectively functionalize the top and bottom surfaces of bilayer graphene.
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