Wu Hao, Li Ming, Zhong Li, Luo Yuan Yuan, Li Guang Hai
Key Laboratory of Materials Physics and, Anhui Key Laboratory of Nanomaterials and Nanostructures, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, P.R. China.
School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, 230026, P.R. China.
Chemistry. 2016 Dec 5;22(49):17627-17634. doi: 10.1002/chem.201604101. Epub 2016 Oct 28.
Amorphous VO (a-VO ) colloids were synthesized by electrochemical anodic oxidation of metallic vanadium. It was found that the a-VO colloids have a cotton-like morphology composed of very small clusters, and that the crystallization temperature of the a-VO colloids can be adjusted either by the electrolyte of the anodic oxidation or/and the dispersion agent of the colloids. VO (M) nanoparticles (NPs) (and a NP film) with an average size of about 50 nm can be obtained by a rapid thermal annealing of the a-VO colloids at 310 °C under air, which is beneficial for practical applications. The VO (M) NP film shows an obvious metal-semiconductor transition with a resistance less than 10 Ω in the metallic state. An integral visible transmittance of 40.7 %, a solar transmittance modulation of 9.4 %, and a resistance modulation in the order of 5×10 were realized in the VO (M) NP film.
通过金属钒的电化学阳极氧化合成了非晶态VO（a-VO）胶体。发现a-VO胶体具有由非常小的簇组成的棉状形态，并且a-VO胶体的结晶温度可以通过阳极氧化的电解质或/和胶体的分散剂来调节。通过在空气中于310°C对a-VO胶体进行快速热退火，可以获得平均尺寸约为50nm的VO（M）纳米颗粒（NPs）（以及NP膜），这有利于实际应用。VO（M）NP膜显示出明显的金属-半导体转变，在金属态下电阻小于10Ω。VO（M）NP膜实现了40.7%的整体可见光透射率、9.4%的太阳透射率调制以及5×10量级的电阻调制。
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