自控温二氧化钒柔性薄膜热敏器件的构筑及其稳定性研究

The aim of this project is to design and construct the flexible VO2 thermo-sensitive device with self-regulating temperature by combining the advantages of Ag nanowires electrode of transparent and temperature-controlling and the thermo-sensitive property of VO2 by thermal induced phase transition; to study the visible-light transmittance and temperature-modulating regulation of Ag nanowires electrode, upon which to reveal the interface stability between Ag nanowires and VO2 nanoparticles under thermal field; to analyze the reversible phase transition and infrared modulation regularity of the devices under different external applied voltages, upon which to provide an effective strategy in the enhancement of the visible-light transmittance and infrared-modulating capability and to disclose dependence of the infrared-modulating capability of VO2 on the external voltage; to investigate the environment and on-line service stability of the VO2 thermo-sensitive device, upon which to propose an effective method of characterizing the on-line service stability of the device. As an important thermal induced phase transition material, VO2 has an extensive applications, such as photoelectric switch, thermistor, infrared remote sensor, uncooled focal plane radiation detector, and so on. The Ag nanowires electrode has an excellent conductivity, transmittance and flexibility. The implement of this project not only has a great scientific significance, but also is essential in developing novel flexible VO2 thermo-sensitive device and providing the corresponding evaluation technology of on-line service stability.

本项目从VO2热致相变入手，以Ag纳米线透明电极的控温性和柔韧性为切入点，结合Ag纳米线电极的优势和VO2纳米材料热敏特性，设计构筑自控温VO2柔性薄膜热敏器件；研究Ag纳米线电极的可见光透过率和控温特性，揭示热场条件下Ag纳米线和VO2纳米颗粒之间界面的稳定性；分析不同外加电压下器件的可逆相变特性和红外光调制规律，提出提高器件可见光透过率和红外光调控能力的有效方法，揭示外电场与VO2红外调控幅度之间的关联；研究器件的环境和在线服役稳定性，提出一种表征VO2热敏器件在线服役稳定性的有效方法。VO2是一种重要的热敏相变材料，在光电开关、热敏电阻、红外遥感接收器和非制冷焦平面辐射探测器等方面有广泛的应用前景。Ag纳米线电极具有优良的导电性、透光性和柔韧性。因此，开展本项目研究不仅具有重要的学术意义，而且对于发展新型柔性薄膜热敏器件和发展VO2热敏器件的在线服役稳定性评估技术具有重要的应用价值。

二氧化钒(VO2)是目前研究最多的无机热致变色材料，可用做智能节能窗的涂层，调控室内温度达到节能目的。VO2相变温度过高是制约其实用化的主要原因之一。本课题以透明导电材料的可控温性、高透光性、柔韧性等为切入点，设计构筑自控温VO2柔性薄膜热敏器件, 将透明导电材料的应用拓展至热致变色领域，同时该器件的自加热功能解决了VO2相变温度过高而无法室温应用的问题；通过改变外加电场的波形，可以实现对红外光透过率的可编程化调控，光响应时间随外加电压的增大而减小；该热敏器件还可对VO2的在线服役稳定性进行快速表征。本课题的研究方法对VO2在光电开关、热敏电阻、红外遥感接收器和非制冷焦平面辐射探测器等军工领域的应用研究具有一定的指导意义。