Journal
NATURE COMMUNICATIONS
Volume 12, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-021-24527-5
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Funding
- National Natural Science Foundation of China [91963129, 51776094]
- Basic Research Project of Science and Technology Plan of Shenzhen [JCYJ20180504165655180]
- Foundation of Shenzhen Science and Technology Innovation Committee [JCYJ20180302174026262]
- SUSTech Core Research Facilities
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This study demonstrates the selective stabilization of all insulating phases in single-crystalline VO2 beams at room temperature through oxide inhibitor-assisted stoichiometry engineering. The precise spatial control of phase configurations introduces a new concept of phase transition route devices. By combining different phase transition routes, high-performance VO2 actuators with improved performance and functional diversity are achieved.
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. Control of the phases associated with the metal-insulator transition in VO2 underpins its applications as a phase change material. Here, the authors report phase management by means of oxide inhibitor-assisted growth and present high-performance VO2 actuators based on asymmetric phase transition routes.
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