Effect of annealing atmosphere on electrochromic property of Bi$_{\textbf{2}}$O$_{\textbf{3}}$ thin films
Received date: 2017-01-11
Online published: 2018-12-26
采用溶胶-凝胶法制备了 Bi$_{2}$O$_{3}$ 薄膜, 分别在空气、氮气、氧气气氛中退火. 用X射线衍射 (X-ray diffraction, XRD) 仪分析薄膜的物相结构; 用扫描电子显微镜 (scanning electron microscope, SEM) 观察薄膜的表面形貌;Doi: 用紫外可见分光光度计 (ultraviolet-visible spectroscopy, UV-Vis) 以及电化学工作站测试薄膜的电致变色性能. 结果表明: Bi$_{2}$O$_{3}$ 薄膜具有电致变色现象, 表现为黑色与透明淡黄色之间的相互转换, 其中氮气气氛退火的样品具有 100${\%}$ 的化学计量比相及较高含量的 $\delta $ 相, 颗粒尺寸分布范围较小, 电致变色效率最高, 约为 21 cm$^{2}$/C.
于静静, 石基, 俞圣雯 . 退火气氛对 Bi$_{\textbf{2}}$O$_{\textbf{3}}$ 薄膜电致变色性能的影响[J]. 上海大学学报(自然科学版), 2018 , 24(6) : 968 -977 . DOI: 10.12066/j.issn.1007-2861.1882
Bi$_{2}$O$_{3}$ thin films were prepared with a sol-gel technique, and annealed in air, nitrogen and oxygen. The phase structures of films were analyzed with X-ray diffraction (XRD). Surface morphology was observed with scanning electron microscope (SEM). Electrochromic properties were tested with ultraviolet-visible spectroscopy (UV-Vis) and an electrochemical workstation. It is discovered that the color state of Bi$_{2}$O$_{3}$ thin films switched between black and light yellow transparent. The Bi$_{2}$O$_{3}$ thin film annealed in nitrogen with 100${\%}$ stoichiometric phase, higher $\delta $ phase, and smaller particle size distribution has the highest electrochromic efficiency of about 21 cm$^{2}$/C.
Key words： bismuth; electrochromic; thin film; sol-gel
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