Vertically distributed VO2nanoplatelets on hollow spheres with enhanced thermochromic properties

2018 ◽  
Vol 6 (29) ◽  
pp. 7896-7904 ◽  
Author(s):  
Huiyan Xu ◽  
Zhengfei Dai ◽  
Chen Wang ◽  
Kewei Xu ◽  
Fei Ma ◽  
...  
Keyword(s):  
Phase Transition ◽  
Energy Saving ◽  
Vanadium Dioxide ◽  
Hollow Spheres ◽  
Smart Windows ◽  
Thermochromic Properties

Vanadium dioxide (VO2) is a phase-transition material exhibiting great potential in the field of smart windows for energy saving.

scholarly journals Hydrothermal growth of VO2 nanoplate thermochromic films on glass with high visible transmittance

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Jiasong Zhang ◽  
Jingbo Li ◽  
Pengwan Chen ◽  
Fida Rehman ◽  
Yijie Jiang ◽  
...  
Keyword(s):  
Visible Light ◽  
Self Assembly ◽  
Vanadium Dioxide ◽  
Hydrothermal Process ◽  
Light Transmittance ◽  
Promising Technique ◽  
Smart Windows ◽  
Visible Transmittance ◽  
Thermochromic Properties ◽  
Facile Hydrothermal Process

Abstract The preparation of thermochromic vanadium dioxide (VO2) films in an economical way is of interest to realizing the application of smart windows. Here, we reported a successful preparation of self-assembly VO2 nanoplate films on TiO2-buffered glass by a facile hydrothermal process. The VO2 films composed of triangle-shaped plates standing on substrates exhibit a self-generated porous structure, which favors the transmission of solar light. The porosity of films is easily controlled by changing the concentration of precursor solutions. Excellent thermochromic properties are observed with visible light transmittance as high as 70.3% and solar modulating efficiency up to 9.3% in a VO2 film with porosity of ~35.9%. This work demonstrates a promising technique to promote the commercial utilization of VO2 in smart windows.

scholarly journals Thermochromic Materials for Smart Windows: A State-of-Art Review

2021 ◽  
Vol 9 ◽  
Author(s):  
Xuanjie Wang ◽  
Shankar Narayan
Keyword(s):  
Energy Saving ◽  
Future Development ◽  
Industrial Production ◽  
Vanadium Dioxide ◽  
Practical Implementation ◽  
Operation Performance ◽  
Smart Windows ◽  
Recent Advancement ◽  
Indoor Comfort ◽  
State Of Art

Smart windows that regulate solar energy by changing optical characteristics have recently gained tremendous interest for energy-saving and indoor-comfort applications. Among them, thermochromic smart windows are promising because of their simplicity for industrial production and ease of implementation. Although significant advancements have been reported on thermochromic materials, both optical and transition properties remain unsatisfactory. This review focuses on the recent advancement of thermochromic materials for smart windows in terms of operation, performance, and potential for commercialization. It discusses the parameters typically used for gauging performance and provides a summary and comparison of various promising thermochromic materials, including vanadium dioxide, hydrogels, and perovskites. The article also points the challenges in the practical implementation of these materials and provides an outlook for future development.

scholarly journals Gate-controlled VO2 phase transition for high-performance smart windows

2019 ◽  
Vol 5 (3) ◽  
pp. eaav6815 ◽  
Author(s):  
Shi Chen ◽  
Zhaowu Wang ◽  
Hui Ren ◽  
Yuliang Chen ◽  
Wensheng Yan ◽  
...  
Keyword(s):  
Phase Transition ◽  
Solar Energy ◽  
Energy Saving ◽  
High Performance ◽  
Light Transmittance ◽  
Energy Regulation ◽  
Practical Application ◽  
Theoretical Limit ◽  
Smart Windows ◽  
Infrared Transmittance

Vanadium dioxide (VO2) is a promising material for developing energy-saving “smart windows,” owing to its infrared thermochromism induced by metal-insulator transition (MIT). However, its practical application is greatly limited by its relatively high critical temperature (~68°C), low luminous transmittance (<60%), and poor solar energy regulation ability (<15%). Here, we developed a reversible and nonvolatile electric field control of the MIT of a monoclinic VO2 film. With a solid electrolyte layer assisting gating treatment, we modulated the insertion/extraction of hydrogen into/from the VO2 lattice at room temperature, causing tristate phase transitions that enable control of light transmittance. The dramatic increase in visible/infrared transmittance due to the phase transition from the metallic (lightly H-doped) to the insulating (heavily H-doped) phase results in an increased solar energy regulation ability up to 26.5%, while maintaining 70.8% visible luminous transmittance. These results break all previous records and exceed the theoretical limit for traditional VO2 smart windows, making them ready for energy-saving utilization.

Recent advances in VO2-based thermochromic composites for smart windows

2018 ◽  
Vol 6 (8) ◽  
pp. 1903-1919 ◽  
Author(s):  
Fang Xu ◽  
Xun Cao ◽  
Hongjie Luo ◽  
Ping Jin
Keyword(s):  
Phase Transition ◽  
Vanadium Dioxide ◽  
Near Infrared ◽  
Infrared Region ◽  
Metal Phase ◽  
Smart Windows ◽  
Thermochromic Material ◽  
Metal Phase Transition ◽  
Near Infrared Region ◽  
Optical Variation

Vanadium dioxide (VO2) is a well-known thermochromic material since it exhibits a notable optical variation in the near-infrared region from transmitting to reflecting upon the semiconductor-to-metal phase transition (SMT).

Research progress on the preparation methods for VO2 nanoparticles and their application in smart windows

CrystEngComm ◽  
2020 ◽  
Vol 22 (5) ◽  
pp. 851-869 ◽  
Author(s):  
Wen Zeng ◽  
Nan Chen ◽  
Weiguang Xie
Keyword(s):  
Phase Transition ◽  
Vanadium Dioxide ◽  
Research Progress ◽  
Metal Insulator ◽  
Preparation Methods ◽  
Smart Windows ◽  
First Order ◽  
Photoelectric Properties ◽  
Insulator Phase Transition

Accompanied with drastic changes in photoelectric properties, vanadium dioxide (VO2) exhibits a first order metal–insulator phase transition (MIT) at the temperature of about 68 °C.

Tungsten-doped vanadium dioxide thin films as smart windows with self-cleaning and energy-saving functions

2017 ◽  
Vol 694 ◽  
pp. 124-131 ◽  
Author(s):  
Zihui Liang ◽  
Li Zhao ◽  
Wanfan Meng ◽  
Cheng Zhong ◽  
Shoubin Wei ◽  
...  
Keyword(s):  
Thin Films ◽  
Energy Saving ◽  
Vanadium Dioxide ◽  
Smart Windows ◽  
Self Cleaning ◽  
Vanadium Dioxide Thin Films

scholarly journals Recent Progress on Vanadium Dioxide Nanostructures and Devices: Fabrication, Properties, Applications and Perspectives

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 338
Author(s):  
Yanqing Zhang ◽  
Weiming Xiong ◽  
Weijin Chen ◽  
Yue Zheng
Keyword(s):  
Phase Transition ◽  
Vanadium Dioxide ◽  
Optical Transmittance ◽  
Structural Features ◽  
Metallic Phase ◽  
Smart Windows ◽  
Future Studies ◽  
Challenges And Opportunities ◽  
Low Dimensional ◽  
Insulating Phase

Vanadium dioxide (VO2) is a typical metal-insulator transition (MIT) material, which changes from room-temperature monoclinic insulating phase to high-temperature rutile metallic phase. The phase transition of VO2 is accompanied by sudden changes in conductance and optical transmittance. Due to the excellent phase transition characteristics of VO2, it has been widely studied in the applications of electric and optical devices, smart windows, sensors, actuators, etc. In this review, we provide a summary about several phases of VO2 and their corresponding structural features, the typical fabrication methods of VO2 nanostructures (e.g., thin film and low-dimensional structures (LDSs)) and the properties and related applications of VO2. In addition, the challenges and opportunities for VO2 in future studies and applications are also discussed.

Optical Switching of Coherent VO2 Precipitates Embedded in Sapphire

1995 ◽  
Vol 396 ◽  
Author(s):  
L. A. Gea ◽  
L. A. Boatner ◽  
J. D. Budai ◽  
R. A. Zuhr
Keyword(s):  
Phase Transition ◽  
Vanadium Dioxide ◽  
Thermal Processing ◽  
Optical Switching ◽  
Optical Transmission ◽  
Structural Phase ◽  
Switching Behavior ◽  
New Type ◽  
Single Crystal Sapphire ◽  
Smart Surface

AbstractIn this work, we report the formation of a new type of active or “smart” surface that is produced by ion implantation and thermal processing. By co-implanting vanadium and oxygen into a single-crystal sapphire substrate and annealing the system under appropriate conditions, it was possible to form buried precipitates of vanadium dioxide that were crystallographically oriented with respect to the host AI2O3 lattice. The implanted VO2 precipitate system undergoes a structural phase transition that is accompanied by large variations in the optical transmission which are comparable to those observed for thin films of VO2 deposited on sapphire. Co-implantation with oxygen was found to be necessary to ensure good optical switching behavior.

scholarly journals Phase management in single-crystalline vanadium dioxide beams

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Run Shi ◽  
Yong Chen ◽  
Xiangbin Cai ◽  
Qing Lian ◽  
Zhuoqiong Zhang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Vanadium Dioxide ◽  
Temperature Phase ◽  
Metal Insulator ◽  
Single Crystalline ◽  
Submicron Scale ◽  
Engineering Strategy ◽  
Improved Performance ◽  
Effective Phase ◽  
Two Sides

AbstractA 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.

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