Tailoring Single- and Double-Sided Fluorination of Bilayer Graphene via Substrate Interactions
- Tailoring Single- and Double-Sided Fluorination of Bilayer Graphene via Substrate Interactions
- 손장엽; Huije Ryu; Junyoung Kwon; Siyuan Huang; Jaehyung Yu; Jingwei Xu; Kenji Watanabe; Takashi Taniguchi; Eunji Ji; Sol Lee; Yongjun Shin; Jong Hun Kim; Kwanpyo Kim; Arend M. vander Zande; Gwan-Hyoung Lee
- Graphene; Chemical functionalization; Fluorination; Substrate interaction; Interlayer interactions
- Issue Date
- Nano letters
- VOL 21, NO 2-898
- 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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