Abstract
Vanadium dioxide (VO2) undergoes a reversible metal–insulator transition, normally at∼68 °C. While the properties of continuous semi-transparent coatings ofVO2 are well known, there is far less information available concerning the potential use of discreteVO2 nanoparticles as a thermochromic pigment in opaque coatings. IndividualVO2 nanoparticles undergo a localized plasmon resonance with near-infraredlight at about 1100 nm and this resonance can be switched on and off bysimply varying the temperature of the system. Therefore, incorporation ofVO2 nanoparticles into a coating system imbues the coating with the ability to self-adaptivelymodulate its own absorptive efficiency in the near-infrared. Here we examine the magnitudeand control of this phenomenon. Prototype coatings are described, made usingVO2 powder produced by an improved process. The materials are characterized usingcalorimetry, x-ray diffraction, high-resolution scanning electron microscopy, transmissionelectron microscopy, and by measurement of optical properties.
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