Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Journal of alloys and compounds, 2022-01, Vol.890, p.161941, Article 161941

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2022

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •The long-term natural aging characteristics of the VOX films were studied in details.•Aging was found to cause a dramatic change in surface composition rather than optical properties.•An aging mechanism involving interface aging and diffusion aging was proposed.•The results provided valuable information for improving the atmospheric durability of VOX films. We experimentally investigate the long-term atmospheric durability of thermochromic vanadium oxide (VOX) films. The VOX films were deposited on glass substrates by reactive direct current magnetron sputtering and were then in-situ annealed at the preparation temperature ≤350 °C. The X-ray photoelectron spectroscopy (XPS) was applied to investigate the surface compositions of the natural aged films, while the optical properties of the films were characterized by the spectrophotometer and spectroscopic ellipsometry. The XPS results reveal that the oxygen-deficient VOX (X < 2.5) components possessing remarkable chemical changes is preferred to react with the O2 and H2O in the air and become high oxidation state compounds. However, it is worth to note that the optical properties of the films shows extra-low variation performance (e.g. linear increasing rate of transmittance ~0.00448% per day @ λ = 600 nm). The aging mechanism of the VOX films in air was interpreted in terms of the interface aging and the diffusion-reaction aging on basis of the above experimental results. This study would provide valuable experience of the natural aging of VOX films.