In:
Angewandte Chemie, Wiley, Vol. 135, No. 16 ( 2023-04-11)
Abstract:
The study of VO 2 flourishes due to its rich competing phases induced by slight stoichiometry variations. However, the vague mechanism of stoichiometry manipulation makes the precise phase engineering of VO 2 still challenging. Here, stoichiometry manipulation of single‐crystal VO 2 beams in liquid‐assisted growth is systematically studied. Contrary to previous experience, oxygen‐rich VO 2 phases are abnormally synthesized under a reduced oxygen concentration, revealing the important function of liquid V 2 O 5 precursor: It submerges VO 2 crystals and stabilizes their stoichiometric phase (M1) by isolating them from the reactive atmosphere, while the uncovered crystals are oxidized by the growth atmosphere. By varying the thickness of liquid V 2 O 5 precursor and thus the exposure time of VO 2 to the atmosphere, various VO 2 phases (M1, T, and M2) can be selectively stabilized. Furthermore, this liquid precursor‐guided growth can be used to spatially manages multiphase structures in single VO 2 beams, enriching their deformation modes for actuation applications.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v135.16
DOI:
10.1002/ange.202301421
Language:
English
Publisher:
Wiley
Publication Date:
2023
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