Bai Huaping, Cortie Michael B, Maaroof Abbas I, Dowd Annette, Kealley Catherine, Smith Geoffrey B
Institute for Nanoscale Technology, University of Technology Sydney, PO Box 123, Broadway, NSW 2007, Australia.
Nanotechnology. 2009 Feb 25;20(8):085607. doi: 10.1088/0957-4484/20/8/085607. Epub 2009 Feb 3.
Vanadium dioxide (VO(2)) undergoes a reversible metal-insulator transition, normally at approximately 68 degrees C. While the properties of continuous semi-transparent coatings of VO(2) are well known, there is far less information available concerning the potential use of discrete VO(2) nanoparticles as a thermochromic pigment in opaque coatings. Individual VO(2) nanoparticles undergo a localized plasmon resonance with near-infrared light at about 1100 nm and this resonance can be switched on and off by simply varying the temperature of the system. Therefore, incorporation of VO(2) nanoparticles into a coating system imbues the coating with the ability to self-adaptively modulate its own absorptive efficiency in the near-infrared. Here we examine the magnitude and control of this phenomenon. Prototype coatings are described, made using VO(2) powder produced by an improved process. The materials are characterized using calorimetry, x-ray diffraction, high-resolution scanning electron microscopy, transmission electron microscopy, and by measurement of optical properties.
二氧化钒（VO₂）通常在约68摄氏度时会发生可逆的金属-绝缘体转变。虽然VO₂连续半透明涂层的特性已广为人知，但关于离散VO₂纳米颗粒作为不透明涂层中的热致变色颜料的潜在用途的信息却少得多。单个VO₂纳米颗粒在约1100纳米处与近红外光发生局域表面等离子体共振，并且通过简单地改变系统温度就可以打开和关闭这种共振。因此，将VO₂纳米颗粒掺入涂层系统中可使涂层具有在近红外区域自适应调节自身吸收效率的能力。在这里，我们研究了这种现象的程度和控制方法。描述了使用改进工艺生产的VO₂粉末制成的原型涂层。通过量热法、X射线衍射、高分辨率扫描电子显微镜、透射电子显微镜以及光学性能测量对材料进行了表征。
