Details

Autor(en) / Beteiligte

• Shi, Run
• Wu, Yonghuang
• Xin, Zeqin
• Guo, Jing
• Li, Zonglin
• Zhao, Bochen
• Peng, Ruixuan
• Li, Chenyu
• Wang, Enze
• Wang, Bolun
• Zhang, Xiaolong
• Cheng, Chun
• Liu, Kai

Titel

Liquid Precursor‐Guided Phase Engineering of Single‐Crystal VO2 Beams

Ist Teil von

• Angewandte Chemie International Edition, 2023-04, Vol.62 (16), p.e202301421-n/a

Auflage

International ed. in English

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The study of VO2 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 VO2 still challenging. Here, stoichiometry manipulation of single‐crystal VO2 beams in liquid‐assisted growth is systematically studied. Contrary to previous experience, oxygen‐rich VO2 phases are abnormally synthesized under a reduced oxygen concentration, revealing the important function of liquid V2O5 precursor: It submerges VO2 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 V2O5 precursor and thus the exposure time of VO2 to the atmosphere, various VO2 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 VO2 beams, enriching their deformation modes for actuation applications. This work investigates the implications of liquid V2O5 precursor on the liquid‐assisted growth of VO2 and further phase engineering of single‐crystal VO2 beams between the M1‐, M2‐, and T‐phases by manipulation of oxygen stoichiometry, enabling various multiphase structures in single VO2 beams and enriching the deformation modes for their actuation applications.