Electrochromic properties of epitaxial WO3 thin films grown on sapphire substrates
Electrochromic properties of epitaxial WO3 thin films grown on sapphire substrates
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DOI：
10.7567/jjap.57.100309
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发表时间：
2018-09
影响因子：
1.5
通讯作者：
M. Yano;Wataru Kuwagata;H. Mito;K. Koike;Shintaro Kobayashi;K. Inaba
中科院分区：
文献类型：
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作者：
M. Yano;Wataru Kuwagata;H. Mito;K. Koike;Shintaro Kobayashi;K. Inaba
报道了在r面蓝宝石衬底上生长的单斜（001）WO3外延薄膜的电致变色特性。在10 mM的硫酸水溶液中施加正偏压，形成水合物和钨青铜，在近红外区域的光学反射率立即增加，随后在可见光至近红外区域的光学吸光度分别增加。在溶液中施加负偏压后，钨青铜消失，而水合物保留下来，需要在空气中退火才能消失。尽管受到底物的限制，这些转变是可逆和反复观察到的。
Electrochromic properties are reported for monoclinic (001) WO3 epitaxial films grown on r-plane sapphire substrates. By applying a positive bias in 10 mM aqueous solution of sulfuric acid, an immediate increase in optical reflectance in a near-infrared region and a subsequent increase in optical absorbance in a visible to near-infrared region were generated by forming a hydrate and a tungsten bronze, respectively. The tungsten bronze disappeared after applying a negative bias in the solution, while the hydrate remained and required an annealing in air to disappear. These transitions were reversibly and repeatedly observed despite the restriction by the substrate.