Conversion of chirality to twisting via sequential one-dimensional and two-dimensional growth of graphene spirals

Conversion of chirality to twisting via sequential one-dimensional and two-dimensional growth of graphene spirals

by | Mar 4, 2024 | 2024, Highlighted, 本组论文

Nature Materials 23, 331–338 (2024).

Zhu-Jun Wang#,*, Xiao Kong#, Yuan Huang#, Jun Li#, Lihong Bao, Kecheng Cao, Yuxiong Hu, Jun Cai, Lifen Wang, Hui Chen, Yueshen Wu, Yiwen Zhang, Fei Pang, Zhihai Cheng, Petr Babor, Miroslav Kolibal, Zhongkai Liu, Yulin Chen, Qiang Zhang, Yi Cui, Kaihui Liu, Haitao Yang, Xinhe Bao, Hong-Jun Gao, Zhi Liu, Wei Ji*, Feng Ding* & Marc-Georg Willinger*

Abstract:

The properties of two-dimensional (2D) van der Waals materials can be tuned through nanostructuring or controlled layer stacking, where interlayer hybridization induces exotic electronic states and transport phenomena. Here we describe a viable approach and underlying mechanism for the assisted self-assembly of twisted layer graphene. The process, which can be implemented in standard chemical vapour deposition growth, is best described by analogy to origami and kirigami with paper. It involves the controlled induction of wrinkle formation in single-layer graphene with subsequent wrinkle folding, tearing and re-growth. Inherent to the process is the formation of intertwined graphene spirals and conversion of the chiral angle of 1D wrinkles into a 2D twist angle of a 3D superlattice. The approach can be extended to other foldable 2D materials and facilitates the production of miniaturized electronic components, including capacitors, resistors, inductors and superconductors.

DOI: 10.1038/s41563-023-01632-y

Also See: News & Views – A double-helix dislocation in graphene | Nature Materials
Also See: Focus – Constructing 2D moiré and chiral materials | Nature Materials

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Van der Waals epitaxial growth of air-stable CrSe2 nanosheets with thickness-tunable magnetic order

Van der Waals epitaxial growth of air-stable CrSe2 nanosheets with thickness-tunable magnetic order

by | Mar 1, 2021 | 2021, Highlighted, 本组论文

Nature Materials 20, 818–825 (2021)

Bo Li#, Zhong Wan#, Cong Wang#, Peng Chen#, Bevin Huang, Xing Cheng, Qi Qian, Jia Li, Zhengwei Zhang, Guangzhuang Sun, Bei Zhao, Huifang Ma, Ruixia Wu, Zhongming Wei, Yuan Liu, Lei Liao, Yu Ye, Yu Huang, Xiaodong Xu, Xidong Duan*, Wei Ji* & Xiangfeng Duan*

Abstract

The discovery of intrinsic ferromagnetism in ultrathin two-dimensional van der Waals crystals opens up exciting prospects for exploring magnetism in the ultimate two-dimensional limit. Here, we show that environmentally stable CrSe2 nanosheets can be readily grown on a dangling-bond-free WSe2 substrate with systematically tunable thickness down to the monolayer limit. These CrSe2/WSe2 heterostructures display high-quality van der Waals interfaces with well-resolved moiré superlattices and ferromagnetic behaviour. We find no apparent change in surface roughness or magnetic properties after months of exposure in air. Our calculations suggest that charge transfer from the WSe2 substrate and interlayer coupling within CrSe2 play a critical role in the magnetic order in few-layer CrSe2 nanosheets. The highly controllable growth of environmentally stable CrSe2 nanosheets with tunable thickness defines a robust two-dimensional magnet for fundamental studies and potential applications in magnetoelectronic and spintronic devices.