Fabrication and manipulation of nanosized graphene homojunction with atomically-controlled boundaries

Hui Chen; De-Liang Bao; Dongfei Wang; Yande Que; Wende Xiao; Yu-Yang Zhang; Jiatao Sun; Shixuan Du; Hong-Jun Gao

doi:10.1007/s12274-020-3004-5

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Research Article

Fabrication and manipulation of nanosized graphene homojunction with atomically-controlled boundaries

Hui Chen^{¹^,²^,^§}, De-Liang Bao^{¹^,²^,^§}, Dongfei Wang^{¹^,²}, Yande Que^¹, Wende Xiao^¹, Yu-Yang Zhang^{¹^,²}, Jiatao Sun^{¹^,²}, Shixuan Du^{¹^,²}(

), Hong-Jun Gao^{¹^,²}(

)

1Institute of Physics and University of Chinese Academy of Sciences, Beijing 100190, China

2CAS Key Laboratory of Vacuum Physics, University of Chinese Academy of Sciences, Beijing 100049, China

^§Hui Chen and De-Liang Bao contributed equally to this work.

Show Author Information

Graphical Abstract

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.

Keywords

homojunction graphene nanoislands manipulations grain boundaries twisted stacking

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Nano Research

Volume 13 Issue 12,
December 2020

Pages 3286-3291

DOI: 10.1007/s12274-020-3004-5

Cite this article:

Chen H, Bao D-L, Wang D, et al. Fabrication and manipulation of nanosized graphene homojunction with atomically-controlled boundaries. Nano Research, 2020, 13(12): 3286-3291. https://doi.org/10.1007/s12274-020-3004-5

Topics:

Crystal atomic structure Density functional theory Electronic properties Etching Fabrication Grain boundaries Graphene Graphite Scanning tunneling microscopy Single crystals Substrates Temperature

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Received: 24 May 2020

Revised: 13 July 2020

Accepted: 21 July 2020

Published: 04 September 2020