六方VO颗粒：合成、机理及热致变色性能

Xu Hui Yan, Xu Ke Wei, Ma Fei, Chu Paul K

State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University Xi'an 710049 Shaanxi China

Department of Physics and Materials Science, City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong China

RSC Adv. 2018 Mar 12;8(18):10064-10071. doi: 10.1039/c8ra00716k. eCollection 2018 Mar 5.

Monoclinic vanadium dioxide VO (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, (211̄)//(21̄1̄) and (21̄1̄)//(020). 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.

采用水热法合成了具有六方结构的单斜晶系二氧化钒VO (M)，并证实了其相演变过程。有趣的是，六方形态是由低能量相干界面(211̄)//(21̄1̄)和(21̄1̄)//(020)形成的。通过改变前驱体溶液的浓度可以很好地控制六方颗粒的尺寸。六方颗粒表现出优异的热致变色性能，滞后宽度窄至5.9 °C，稳定性高。此外，通过简单的W掺杂，相变温度可大幅降低至28 °C。