Electrochromic reaction of InN thin films
Electrochromic reaction of InN thin films
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InN薄膜的电致变色反应
DOI：
10.1149/1.1391942
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发表时间：
1999
影响因子：
3.9
通讯作者：
O. Takai
中科院分区：
文献类型：
--
作者：
N. Asai;Y. Inoue;H. Sugimura;O. Takai
通过X射线光电子能谱（XPS）和X射线衍射（XRD）研究了射频离子镀氮化铟（InN）薄膜的电致变色（EC）反应。此外，EC反应的pH依赖性进行了表征。在Na{sub 2}SO{sub 4}溶液中，InN薄膜分别阳极极化或阴极极化时，InN薄膜的颜色变深或变浅。当Na{sub 2}SO{sub 43}溶液的pH从4.0变为11.6时，观察到类似的颜色变化。在一个单位的pH差下的颜色变化对应于在59 mV的电位差下的EC颜色变化。从这些结果中，H{sup +}和OH{sup {minus}}被证实是在InN膜的EC反应的活性反应物。另一方面，XPS和XRD结果表明，阳极极化的InN膜的晶界和表面处形成的氢氧化物的量大于阴极极化的膜。因此，InN薄膜的电致变色是由H{sup +}和OH{sup {minus}}在晶界的化学吸附所控制的。
Electrochromic (EC) reaction of indium nitride (InN) films prepared by radio frequency (rf) ion plating was studied through their chemical bonding states and crystalline structures as measured by X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), respectively. In addition, the pH dependence of the EC reaction was characterized. Color of the InN films became darker or lighter when the InN films were polarized anodically or cathodically, respectively, in a Na{sub 2}SO{sub 4} solution. Similar color changes were observed when pH of the Na{sub 2}SO{sub 43} solution was changed from 4.0 to 11.6. The color change at one unit of pH difference corresponded to the EC color change at a potential difference of 59 mV. From these results, H{sup +} and OH{sup {minus}} were confirmed to be active reactants in the EC reaction of the InN films. On the other hand, it was revealed from XPS and XRD results that the amount of hydroxides formed at the grain boundaries and the surface of the anodically polarized InN films was greater than that of the film polarized cathodically. Therefore, the electrochromism of the InN films was concluded to be governed by chemisorption of H{sup +} and OH{sup {minus}} at grain boundaries.