Space-confined growth of monolayer ReSe2 under a graphene layer on Au foils
graphene, rhenium selenide, chemical vapor deposition, scanning tunneling microscopy, two-dimensional (2D) heterostructure
Vertical heterostructures based on two-dimensional (2D) materials have attracted widespread interest for their numerous applications in electronic and optoelectronic devices. Herein, we report the direct construction of an abnormal graphene/ReSe2 stack on Au foils by a two-step chemical vapor deposition (CVD) strategy. During the second growth stage, monolayer ReSe2 is found to preferentially evolve at the interface between the first-grown graphene layer and the Au substrate. The unusual stacking behavior is unraveled by in-situ “cutting open” the upper graphene from the defects to expose the lower ReSe2 using scanning tunneling microscopy (STM). From combination of these results with density functional theory calculations, the domain boundaries and edge sites of graphene are proposed to be adsorption sites for Re and Se precursors, further facilitating the growth of ReSe2 at the van der Waals gap of graphene/Au. This work hereby offers an intriguing strategy for obtaining vertical 2D heterostructures featured with an ultra-clean interface and a designed stacking geometry.
Tsinghua University Press
Chunyu Xie,Shaolong Jiang,Xiaolong Zou,Yuanwei Sun,Liyun Zhao,Min Hong,Shulin Chen,Yahuan Huan,Jianping Shi,Xiebo Zhou,Zhepeng Zhang,Pengfei Yang,Yuping Shi,Porun Liu,Qing Zhang,Peng Gao,Yanfeng Zhang, Space-confined growth of monolayer ReSe2 under a graphene layer on Au foils. NanoRes.2019, 12(1): 149–157