title: Controlled Folding of Single Crystal Graphene.
abstract: Folded graphene in which two layers are stacked with a twist angle between them has been predicted to exhibit unique electronic, thermal, and magnetic properties. We report the folding of a single crystal monolayer graphene film grown on a Cu(111) substrate by using a tailored substrate having a hydrophobic region and a hydrophilic region. Controlled film delamination from the hydrophilic region was used to prepare macroscopic folded graphene with good uniformity on the millimeter scale. This process was used to create many folded sheets each with a defined twist angle between the two sheets. By identifying the original lattice orientation of the monolayer graphene on Cu foil, or establishing the relation between the fold angle and twist angle, this folding technique allows for the preparation of twisted bilayer graphene films with defined stacking orientations and may also be extended to create folded structures of other two-dimensional nanomaterials.
authors.affiliation: Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.
authors.forename: Bin
authors.identifier: 0000-0001-9576-2646
authors.initials: B
authors.lastname: Wang
authors.affiliation: Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.|School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919, Republic of Korea.
authors.forename: Ming
authors.initials: M
authors.lastname: Huang
authors.affiliation: Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.|School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919, Republic of Korea.
authors.forename: Na Yeon
authors.identifier: 0000-0003-3424-5965
authors.initials: NY
authors.lastname: Kim
authors.affiliation: Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.
authors.forename: Benjamin V
authors.initials: BV
authors.lastname: Cunning
authors.affiliation: Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Huang
authors.affiliation: SKKU Advanced Institute of Nano-Technology (SAINT), Department of Nano Science and Technology, Sungkyunkwan University , 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea.
authors.forename: Deshun
authors.initials: D
authors.lastname: Qu
authors.affiliation: Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.
authors.forename: Xianjue
authors.identifier: 0000-0002-4757-7152
authors.initials: X
authors.lastname: Chen
authors.affiliation: Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.
authors.forename: Sunghwan
authors.initials: S
authors.lastname: Jin
authors.affiliation: Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.
authors.forename: Mandakini
authors.initials: M
authors.lastname: Biswal
authors.affiliation: Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.
authors.forename: Xu
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.
authors.forename: Sun Hwa
authors.initials: SH
authors.lastname: Lee
authors.affiliation: Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.
authors.forename: Hyunseob
authors.initials: H
authors.lastname: Lim
authors.affiliation: SKKU Advanced Institute of Nano-Technology (SAINT), Department of Nano Science and Technology, Sungkyunkwan University , 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 16419, Republic of Korea.
authors.forename: Won Jong
authors.identifier: 0000-0002-3767-7969
authors.initials: WJ
authors.lastname: Yoo
authors.affiliation: Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.|School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919, Republic of Korea.
authors.forename: Zonghoon
authors.identifier: 0000-0003-3246-4072
authors.initials: Z
authors.lastname: Lee
authors.affiliation: Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.|Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919, Republic of Korea.|School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919, Republic of Korea.
authors.forename: Rodney S
authors.initials: RS
authors.lastname: Ruoff
keywords: Graphene; fold; single crystal; twisted bilayer