Bioinspired Multifunctional Vanadium Dioxide: Improved Thermochromism and Hydrophobicity

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• 作者：Xukun Qian ; Ning Wang ; Yunfeng Li ; Junhu Zhang ; Zhichuan Xu ; Yi Long
• 刊名：Langmuir
• 出版年：2014
• 出版时间：September 9, 2014
• 年：2014
• 卷：30
• 期：35
• 页码：10766-10771
• 全文大小：410K
• ISSN：1520-5827

文摘

Vanadium dioxide (VO₂) films with moth-eye nanostructures have been fabricated to enhance the thermochromic properties with different periodicity (d) to achieve antireflection (AR). It is revealed that the films with smaller d (210 and 440 nm) could increase both the luminous transmission (T_lum) and infrared transmission (T_IR) at 25 and 90 ^oC, as the d is smaller than the given wavelength and the gradient refractive index produces antireflection. The average T_lum and T_IR of VO₂ increase with decreasing d. Compared with the planar film, the AR sample with periodicity of 210 nm and thickness of 140 nm can offer approximately 10% enhancement of T_lum and 24.5% increase in solar modulation (螖T_sol). With the addition of hydrophobic overcoat on the patterned VO₂, 鈭?20掳 contact angle could be achieved. The present approach can tailor the optical transmittance in different wavelengths at high and low temperature together with self-cleaning, opening new avenues for producing hydrophobic VO₂ with enhanced thermochromic properties for smart window applications.