Chutian Wang

Materials Science & Engineering

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Panpan Gao

University of Science and Technology Beijing

Bin Shen

Sichuan University

Huiqiu Yuan

Collaborative Innovation Center of Advanced Microstructures

Dayong Tan

Guangzhou Institute of Geochemistry

Jingyi Shen

Westlake University

Chen Wang

Institute of Microelectronics

Yichi Zhang

University of Science and Technology Beijing

Lingyun Tang

South China University of Technology

Qi Fu

Westlake University

Xiao‐Xu Wang

Northwestern Polytechnical University

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University of Science and Technology Beijing

Chinese Academy of Sciences

Center for High Pressure Science and Technology Advanced Research

Westlake University

ARC Centre of Excellence in Future Low-Energy Electronics Technologies

Monash University

Australian Regenerative Medicine Institute

Sun Yat-sen University

Beijing Advanced Sciences and Innovation Center

Tsinghua University

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Giant piezoresistivity in a van der Waals material induced by intralayer atomic motions

Nature Communications (2023)

Lingyun Tang Zhongquan Mao Chutian Wang Qi Fu Chen Wang

Abstract The presence of the van der Waals gap in layered materials creates a wealth of intriguing phenomena different to their counterparts in conventional materials. For example, pressurization can generate a large anisotropic lattice shrinkage along the stacking orientation and/or a significant interlayer sliding, and many of the exotic pressure-dependent properties derive from these mechanisms. Here we report a giant piezoresistivity in pressurized β ′-In 2 Se 3 . Upon compression, a six-orders-of-magnitude drop of electrical resistivity is obtained below 1.2 GPa in β′ -In 2 Se 3 flakes, yielding a giant piezoresistive gauge π p of −5.33 GPa −1 . Simultaneously, the sample undergoes a semiconductor-to-semimetal transition without a structural phase transition. Surprisingly, linear dichroism study and theoretical first principles modelling show that these phenomena arise not due to shrinkage or sliding at the van der Waals gap, but rather are dominated by the layer-dependent atomic motions inside the quintuple layer, mainly from the shifting of middle Se atoms to their high-symmetric location. The atomic motions link to both the band structure modulation and the in-plane ferroelectric dipoles. Our work not only provides a prominent piezoresistive material but also points out the importance of intralayer atomic motions beyond van der Waals gap.

Piezoresistive effect

10.1038/s41467-023-37239-9

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Influence of composition and size on the thermodynamic stability and structural evolution of CuAlNi nanoclusters

Progress in Natural Science Materials International (2020)

Qing Liu Ye Su Keke Song Xiao‐Xu Wang Panpan Gao

The heating process for CuAlNi nanoclusters with cuboctahedral structure was studied by molecular dynamics simulation with the embedded atom method. A diffusionless martensitic transformation from the cuboctahedral (CO) to the icosahedral (ICO) structure before the melting point was found in some CuAlNi nanoclusters. The effects of element composition and cluster size on the thermodynamic stability and structural transformation of trimetallic nanoclusters were investigated. The results show that the CO–ICO transformation temperature was size-dependent and occurred only for small clusters. It was also observed that the CO–ICO transformation temperature firstly dropped and then raised as Al concentration increased, which may be strongly related to the release of excess energy. Furthermore, the surface segregation phenomenon was also observed that the lower surface energy components, such as Al and Cu atoms, segregated to the surface of CuAlNi nanoclusters. The changes in the melting points of CuAlNi nanoclusters with different alloy compositions and cluster sizes were also studied. And furthermore, the physical basis of structural transition of CuAlNi nanoclusters was discussed.

Nanoclusters

Diffusionless transformation

10.1016/j.pnsc.2020.07.001

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