Abstract
A convenient route for the preparation of thermochromic VO2 particles has been developed by combining solution-phase hydrolysis and a thermal reduction process. With this method, the particle size can be easily tuned from tens to hundreds of nanometres. The liquid dispersibility of these VO2 particles facilitates convenient observation and effective measurement of the temperature-dependent optical properties in the visible region. We observe a blue shift of the resonance peak of metal-phase VO2 particles with decreasing size. The size effect also exists in the phase transition behavior: smaller VO2 particles exhibit a wider hysteresis curve during the semiconductor-to-metal transition. We also demonstrate that the VO2 particles in the form of a colloidal dispersion can be easily incorporated into thin plastic thermochromic films that may be used as smart windows for energy management.
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