Effects of natural aging on the surface compositions and optical properties of thermochromic vanadium oxide films

Luo, Zhenfei; Zhang, Qingwei; Zhang, Fei; Wei, Yaowei; Wang, Zhen; Luo, Jin; Yao, Na; Dong, Xiang; Wu, Zhiming; Jiang, Yadong; Zhang, Qinghua; Jian, Wang

doi:10.1016/j.jallcom.2021.161941

Cited by 5 publications

(2 citation statements)

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“…The fresh surface of the VO x films reacts readily with the water in air, resulting in the appearance of OH − peaks. 49 The shift in peak position caused by the hydroxyl group is significantly lower in V 2 O 5 , which indicates that the adsorption of water on its surface is relatively low under the same conditions. The XPS results show the structure of the films from the inside to the outside as substrate, V 2 O 3 , VO 2 , and VO 5 , respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

“…In addition, the OH – sub-peak on the O 1s peak in Figure g has been observed, which makes the shape of the O 1s peak asymmetrical. The fresh surface of the VO x films reacts readily with the water in air, resulting in the appearance of OH – peaks . The shift in peak position caused by the hydroxyl group is significantly lower in V 2 O 5 , which indicates that the adsorption of water on its surface is relatively low under the same conditions.…”

Section: Resultsmentioning

confidence: 98%

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Gradient Variation Oxygen-Content Vanadium–Oxygen Composite Films with Enhanced Crystallinity and Excellent Durability for Smart Windows

Cao

et al. 2023

ACS Appl. Mater. Interfaces

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Vanadium dioxide (VO 2 )-based smart windows show excellent promise for energy-saving and have been extensively researched. However, for the glass industry-compatible magnetron sputtering process, VO 2 films are difficult to obtain and have homogeneous crystalline state, leaving them lacking the ideal solar modulation (ΔT sol ) and sensitivity (narrow hysteresis loop). More importantly, the instability of VO 2 hinders its commercialization. Multilayer structures have been repeatedly investigated to solve these problems. Unfortunately, the mediocre thermochromic properties as well as the complex and expensive manufacturing steps still hinder its commercialization. In this work, we prepared gradient variation oxygen-content vanadium−oxygen composite films (V 2 O 3 /VO 2 /V 2 O 5 , VO gv ) with enhanced crystallinity and excellent durability by one-step continuous sputtering. According to optical measurements, the ΔT sol of the VO gv films was significantly increased by 145% (from 6.85 to 16.80%) compared to VO 2 films, and the width of the hysteresis loop was reduced by 67% (from 19.34 to 6.36 °C), while the VO gv films exhibited a wider preparation window. The accelerated tests have shown that the film has an equivalent service life of approximately 20 years. We exploited the intrinsic similarity in properties of homologous compounds of vanadium oxide and simplified the preparation process, which is supposed to break the existing application bottlenecks and increase the commercializing possibility of VO 2 -based thermochromic smart windows.

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Section: ■ Results and Discussionmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 98%