Huaping Bai et al 2009 Nanotechnology 20 085607 doi:10.1088/0957-4484/20/8/085607
Huaping Bai1,2, Michael B Cortie1, Abbas I Maaroof1, Annette Dowd1, Catherine Kealley1 and Geoffrey B Smith1
Show affiliationsVanadium dioxide (VO2) undergoes a reversible metal–insulator transition, normally at ~68 °C. While the properties of continuous semi-transparent coatings of VO2 are well known, there is far less information available concerning the potential use of discrete VO2 nanoparticles as a thermochromic pigment in opaque coatings. Individual VO2 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 VO2 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 VO2 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.
81.07.-b Nanoscale materials and structures: fabrication and characterization
68.37.Lp Transmission electron microscopy (TEM)
71.30.+h Metal-insulator transitions and other electronic transitions
81.16.-c Methods of nanofabrication and processing
78.67.Bf Nanocrystals and nanoparticles
68.37.Hk Scanning electron microscopy (SEM) (including EBIC)
Condensed matter: electrical, magnetic and optical
Issue 8 (25 February 2009)
Received 14 October 2008, in final form 10 January 2009
Published 3 February 2009
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