Hexagonal VO2 particles: synthesis, mechanism and thermochromic properties†
Hui Yan
Xu, 
ab
ab
Abstract
Monoclinic vanadium dioxide VO2 (M) with hexagonal structure is synthesized by hydrothermal method, and the phase evolution is evidenced. Interestingly, the hexagonal morphology comes into being as a result of the low-energy coherent interfaces, (21![[1 with combining macron]](https://www.rsc.org/images/entities/char_0031_0304.gif)
)1//(2)2 and (2)1//(020)2. The size of hexagonal particles is well controlled by changing the concentration of precursor solutions. Hexagonal particles exhibit excellent thermochromic properties with a narrow hysteresis of 5.9 °C and high stability. In addition, the phase transition temperature can be substantially reduced down to 28 °C by simply W doping.
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