Phase management in single-crystalline vanadium dioxide beams

Run Shi, Yong Chen, Xiangbin Cai, Qing Lian, Zhuoqiong Zhang, Nan Shen, Abbas Amini, Ning Wang and Chun Cheng ()
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Run Shi: Southern University of Science and Technology
Yong Chen: Southern University of Science and Technology
Xiangbin Cai: Hong Kong University of Science and Technology
Qing Lian: Southern University of Science and Technology
Zhuoqiong Zhang: Southern University of Science and Technology
Nan Shen: Southern University of Science and Technology
Abbas Amini: Western Sydney University
Ning Wang: Hong Kong University of Science and Technology
Chun Cheng: Southern University of Science and Technology

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract A systematic study of various metal-insulator transition (MIT) associated phases of VO2, including metallic R phase and insulating phases (T, M1, M2), is required to uncover the physics of MIT and trigger their promising applications. Here, through an oxide inhibitor-assisted stoichiometry engineering, we show that all the insulating phases can be selectively stabilized in single-crystalline VO2 beams at room temperature. The stoichiometry engineering strategy also provides precise spatial control of the phase configurations in as-grown VO2 beams at the submicron-scale, introducing a fresh concept of phase transition route devices. For instance, the combination of different phase transition routes at the two sides of VO2 beams gives birth to a family of single-crystalline VO2 actuators with highly improved performance and functional diversity. This work provides a substantial understanding of the stoichiometry-temperature phase diagram and a stoichiometry engineering strategy for the effective phase management of VO2.

Date: 2021
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DOI: 10.1038/s41467-021-24527-5

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