Correction to“Multifunctional Flexible Vanadium Dioxide Films”

The author affiliation of the author Ying Zhu should be changed to“State Key Laboratory of High-Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China”.Miss Zhu received her M.S.in Materials Engineering from Shanghai Institute of Ceramics,Chinese Academy of Sciences,in 2020.Then she became a joint Ph.D.student of The University of British Columbia,Canada and Southern University of Science and Technology,China.

Multifunctional Flexible Vanadium Dioxide Films

CONSPECTUS:As a typical phase transition material,vanadium dioxide(VO_(2))has attracted much attention due to its amazing metal−insulator transition(MIT)at the critical temperature of 68°C,which could be driven by multiple stimuli,including electricity,thermal irradiation,THz waves,strain,etc.In the MIT process,VO_(2)exhibits significant changes in its structure from monoclinic structure at low temperature to rutile structure at high temperature,accompanied by significant modulation of physical properties,such as the infrared transmittance from high to low and a resistivity drop over 5 magnitudes.Based on these features,VO_(2)has functioned as thermochromic coatings,sensors,switches,electronic devices,actuators,etc.However,the vanadium element possesses multiple valent states and can produce complicated thermodynamics of vanadium oxides.The fabrication of tetravalence VO_(2)with desirable phase-transition features usually requires rigorous fabrication conditions with a precisely controlled atmosphere for stoichiometric components and high temperatures for good crystallinity.Under these circumstances,it is difficult to directly fabricate crystalline VO_(2)films on flexible polymer substrates because most of them could not stand such high temperatures(usually>400°C),which will lead to the loss of the substrate functionality.However,the featured phase transition of VO_(2)makes it a promising candidate for future flexible devices,while VO_(2)owns great potential as flexible optical coatings,flexible sensors,flexible electronics,etc.Hence,research on flexible VO_(2)films is necessary and could largely pave the way to the application field of VO_(2)material.In this Account,we start with a brief introduction to phase transition properties of VO_(2)to reveal the intrinsic advantages as key materials in flexible devices.Next,multifunctional devices based on flexible VO_(2)films with different forms and characteristics are presented,including(1)flexible VO_(2)-film-based thermochromic smart windows for energy-saving function depending on the change of environmental temperatures,(2)flexible VO_(2)films optical devices based on the changing emissivity of VO_(2),(3)flexible VO_(2)films with compatibility as multifunctional sensors,(4)next-generation flexible electronics based on VO_(2)films,and(5)flexible VO_(2)actuators with significant mechanical motions under external stimuli.Meanwhile,various fabrication technologies of flexible VO_(2)films have been introduced and discussed.Finally,we end the Account with an overview of the remaining challenges and new opportunities that have been opened up for vanadium dioxide in new forms of flexible optical and electronic devices.We hope this Account will inspire new innovative designs,fabrication approaches,and more possible functions of flexible VO_(2)films in future work.