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- Title
Fabrication and manipulation of nanosized graphene homojunction with atomically-controlled boundaries.
- Authors
Chen, Hui; Bao, De-Liang; Wang, Dongfei; Que, Yande; Xiao, Wende; Zhang, Yu-Yang; Sun, Jiatao; Du, Shixuan; Gao, Hong-Jun
- Abstract
Controlling the atomic configurations of structural defects in graphene nanostructures is crucial for achieving desired functionalities. Here, we report the controlled fabrication of high-quality single-crystal and bicrystal graphene nanoislands (GNI) through a unique top-down etching and post-annealing procedure on a graphite surface. Low-temperature scanning tunneling microscopy (STM) combined with density functional theory calculations reveal that most of grain boundaries (GBs) formed on the bicrystal GNIs are 5-7-5-7 GBs. Two nanodomains separated by a 5-7-5-7 GB are AB stacking and twisted stacking with respect to the underlying graphite substrate and exhibit distinct electronic properties, forming a graphene homojunction. In addition, we construct homojunctions with alternative AB/twisted stacking nanodomains separated by parallel 5-7-5-7 GBs. Remarkably, the stacking orders of homojunctions are manipulated from AB/twist into twist/twist type through a STM tip. The controllable fabrication and manipulation of graphene homojunctions with 5-7-5-7 GBs and distinct stacking orders open an avenue for the construction of GBs-based devices in valleytronics and twistronics.
- Publication
Nano Research, 2020, Vol 13, Issue 12, p3286
- ISSN
1998-0124
- Publication type
Article
- DOI
10.1007/s12274-020-3004-5