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The preparation of a plasmonically resonant VO2 thermochromic pigment

Huaping Bai1,2, Michael B Cortie1, Abbas I Maaroof1, Annette Dowd1, Catherine Kealley1 and Geoffrey B Smith1

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Vanadium 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.


PACS

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)

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Nanoscale science and low-D systems

Dates

Issue 8 (25 February 2009)

Received 14 October 2008, in final form 10 January 2009

Published 3 February 2009



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