What is it about?

Strain measures how much a given deformation differs locally from its original shape. Strain engineering is typically used in the semiconductor industry to build faster transistors. Two-dimensional (2D) materials are a new type of material that could be as thin as 1 nm. 2D materials have unique properties that could sustain strain up to 25%. However, reversible applying strain on 2D materials is challenging due to the lack of bonding between the substrate and the 2D materials. Using an oven treated as low as the temperature to boiling the water, you can make the straining of 2D materials on polymer substrate more robust and reproducible. After this treatment, the morphology of 2D materials on polymer substrate changed dramatically, and the materials could survive in water for days to weeks. We anticipate the facile methodology and understanding of the straining could boost the field of 2D materials and devices.

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Why is it important?

Improving strain engineering experiments in 2D materials could lead to a new generation of strain tunable devices (e.g. emitters, photodetectors). The approach used in this work to suppress the slippage and improve strain transfer will be helpful for many researchers working on strain engineering of 2D materials.


Our methodology demonstrates an efficient and fast method to enhance the straining of 2D materials by a low-pressure thermal annealing process.

Yong Xie
Xidian University

Read the Original

This page is a summary of: Straining of atomically thin WSe2 crystals: Suppressing slippage by thermal annealing, Journal of Applied Physics, August 2022, American Institute of Physics,
DOI: 10.1063/5.0096190.
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