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.
Bibliographical noteFunding Information:
This work was supported by National Research Foundation (NRF) funded by the Ministry of Science, ICT & Future Planning by the Korean government (2018M3D1A1058793, 2017R1A5A1014862, SRC program: vdWMRC center), the New Faculty Startup Fund and Creative-Pioneering Researchers Program from Seoul National University. A.M.v.d.Z. acknowledges support from NSF-MRSEC under Award Number DMR-1720633, the NSF-CAREER award under Award Number CMMI-1846732, and TSMC Grant under Award Number TSMC Taiwan 089401. J.S. acknowledges support from the KIST Institution Program (2K02420, 2Z06030). K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant Number JPMXP0112101001, JSPS KAKENHI Grant Numbers JP20H00354 and the CREST(JPMJCR15F3), JST. K.K. acknowledges support from Basic Science Research Program through the National Research Foundation of Korea (NRF-2017R1A5A1014862).
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering