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- W2588339155 abstract "Monoclinic (M1) VO2 film has potential applications in thermochromic modulators owing to the particular optical performance caused by phase transition. However, its controllable preparation is very difficult due to the multivalence of V element. Here, we studied a sol-gel process followed by annealing in a closed vaccum furnace containing NH3 atmosphere, and discussed the formation mechanism of M1-phase VO2 films. Thermochromic M1-phase VO2 thin films can be fabricated under the base pressure of 600–2000 Pa with the annealing temperature at 470–590 °C for more than 0.5 h, and the optimal condition is at 1000–2000 Pa and 500–530 °C for 0.5 h, by synthetically considering their luminous transmittance (Tlum), solar modulation efficiency (ΔTsol), and modulation efficiency at 2000 nm (ΔT2000nm). The M1-phase VO2 thin film generally exhibits the optical properties with Tlum ≈ 39–41%, ΔTsol ≈ 7.7% and ΔT2000nm ≈ 50%. A higher base pressure introduces more oxygen to remove polymers in precursors, enhancing the transparency of films. Improving the temperature or the duration promotes the growth of VO2 crystallite with limits. However, inappropriate base pressure, temperature or duration will reduce or oxidize the VO2 films, resulting in the inferior thermochromic properties. According to thermal and XPS analysis, NH3 can act as a reductant to prevent oxidation of VO2 films during the annealing process. This convenient heat treatment method to synthesize M1-VO2 films may provide a useful and practical technique for the production of VO2-based smart window and optical devices." @default.
- W2588339155 created "2017-02-24" @default.
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- W2588339155 date "2017-06-01" @default.
- W2588339155 modified "2023-10-18" @default.
- W2588339155 title "Optical properties and formation mechanism of M1-phase VO 2 thin films annealed in a closed NH 3 atmosphere" @default.
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- W2588339155 doi "https://doi.org/10.1016/j.jallcom.2017.02.151" @default.
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