Infrared thermochromic properties of VO2 thin films prepared through aqueous sol-gel process
Infrared thermochromic properties of VO2 thin films prepared through aqueous sol-gel process
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DOI：
10.1007/s11595-012-0563-7
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发表时间：
2012-10-01
影响因子：
1.6
通讯作者：
Zhang Chaoyang
中科院分区：
文献类型：
--
作者：
Liu Dongqing;Cheng Haifeng;Zhang Chaoyang
通过控制退火的温度、时间和压力，得到了化学计量比的氧化钒薄膜。讨论了400 nm和900 nm VO_2薄膜在7.5 μ m-14 μ m范围内的热致变色相变和红外热致变色特性。用拉曼、X射线衍射、X射线光电子能谱、原子力显微镜、扫描电镜和差示扫描量热仪对样品进行了表征。测量了不同温度下VO 2薄膜的电阻率和红外发射率，并利用红外热像仪获得了薄膜的热图像。结果表明，采用水溶胶-凝胶法在550 A ℃下退火10 h制备的VO 2薄膜纯度高、均匀性好。900 nm的VO 2薄膜比400 nm的VO 2薄膜具有更好的红外热致变色性能。900 nm VO 2薄膜的电阻率在相变过程中可变化4个数量级，发射率可变化0.6，表现出优异的红外热致变色性能。所制备的VO 2薄膜在真实的温度升高时，可以主动控制其红外辐射强度，降低其表观温度，可应用于节能、热控制和伪装等领域。
The stoichiometric vanadium(IV) oxide thin films were obtained by controlling the temperature, time and pressure of annealing. The thermochromic phase transition and the IR thermochromic property of 400 nm and 900 nm VO2 thin films in the 7.5 mu m-14 mu m region were discussed. The derived VO2 thin film samples were characterized by Raman, XRD, XPS, AFM, SEM, and DSC. The resistance and infrared emissivity of VO2 thin films under different temperature were measured, and the thermal images of films were obtained using infrared imager. The results show that the VO2 thin film annealed at 550 A degrees C for 10 hours through aqueous sol-gel process is pure and uniform. The 900 nm VO2 thin film exhibits better IR thermochromic property than the 400 nm VO2 thin film. The resistance of 900 nm VO2 film can change by 4 orders of magnitude and the emissivity can change by 0.6 during the phase transition, suggesting the outstanding IR thermochromic property. The derived VO2 thin film can control its infrared radiation intensity and lower its apparent temperature actively when the real temperature increases, which may be applied in the field of energy saving, thermal control and camouflage.