纳米三氧化钨薄膜和无定形锰酸锂薄膜的制备及其电致变色性能研究

发布时间：2018-02-12 02:46

本文关键词： 电致变色三氧化钨锰酸锂薄膜光学调制范围多重变色　出处：《浙江大学》2017年硕士论文　论文类型：学位论文

【摘要】：电致变色材料由于其变色电压低、颜色变化多种多样、节能环保等优势,在灵巧智能窗、电子纸、电致变色显示器、智能穿戴材料等领域有着广泛的应用前景。但对于无机电致变色薄膜材料仍存在光学调制范围小、变色速度慢、循环稳定性差、颜色变化单一、着色效率低等缺陷,为此本文研究了 WO3和LiMn2O4两种薄膜材料,相关实验主要分为两个部分,首先是改进WO3的制备方法以改善电致变色性能,其次是探索了 LiMn2O4电极材料作为新型电致变色材料。具体实验结果如下:(1)采用单层种子层旋涂法结合水热法制备出h-W03纳米线薄膜,并研究了乙二醇的加入对其电致变色性能的影响。结果显示,乙二醇的加入能大幅地增加其光学调制范围,在633nm处的光学透过率变化可达82.6%,对于620～900nm波长范围的光可近似认为完全吸收,而且具有相当的着色效率和相当的变色速率,这对于WO3薄膜应用电致变色节能窗具有重要意义;(2)采用溶胶-凝胶提拉法制备出无定形的LiMn2O4薄膜,并研究了乙醇和1.5-戊二醇作为添加剂对其成膜性能和电致变色性能的影响。结果显示,乙醇和1,5-戊二醇的加入均能有效地提高LiMn2O4薄膜的成膜性能,其中乙醇作为添加剂制备的LiMn2O4薄膜还具有出色的电致变色性能,具体来说在460nm处的光学透过率变化可达43.4%,着色、褪色时间分别为2.6s和1.9s,着色效率为50.8cm2.C-1而且拥有多阶段、多色态的颜色变化,能在无色、黄绿色和橙黄色之间变化,由于其变色前后只在蓝紫色波段由明显的吸光度变化,在红外波段则保持较高的透过率,这对于LiMn2O4薄膜应用于信息检测、电致变色显示器领域,以及制备无机多重电致变色材料具有重要意义。
[Abstract]:Electrochromic materials, due to their low color voltage, variety of color, energy-saving and environmental protection, in smart smart windows, electronic paper, electrochromic display, Intelligent wearable materials and other fields have wide application prospects, but for inorganic electrochromic thin films, there are still some defects such as small optical modulation range, slow color changing speed, poor cycle stability, single color change, low coloring efficiency, etc. In this paper, two kinds of thin film materials, WO3 and LiMn2O4, are studied. The related experiments are divided into two parts. Firstly, the preparation method of WO3 is improved to improve the electrochromic properties. Secondly, the LiMn2O4 electrode material as a new electrochromic material was explored. The experimental results are as follows: (1) the h-W03 nanowire film was prepared by single layer seed layer spin coating method combined with hydrothermal method. The effect of the addition of ethylene glycol on its electrochromic properties was studied. The results show that the addition of ethylene glycol can greatly increase the optical modulation range. The optical transmittance at 633nm can vary by 82.6. For the wavelength range of 620nm, the optical transmittance can be approximately considered to be completely absorbed, and it has a considerable coloring efficiency and a comparable chromotropic rate. This is of great significance for the application of electrochromic energy saving windows to WO3 thin films. (2) amorphous LiMn2O4 thin films are prepared by sol-gel Czochralski method. The effects of ethanol and 1. 5-pentanediol as additives on the film forming and electrochromic properties of LiMn2O4 films were studied. The results showed that the addition of ethanol and 1 pentanediol could effectively improve the film forming properties of LiMn2O4 films. The LiMn2O4 film prepared with ethanol as additive also has excellent electrochromic properties. Specifically, the optical transmittance at 460 nm can change to 43.44.The fading time is 2.6 s and 1.9 s, respectively, and the coloring efficiency is 50.8 cm2.C-1 and has many stages. The color change of polychromatic state can change between colorless, yellowish green and orange-yellow, because its color changes only by obvious absorbance in the blue-purple band before and after its discoloration, and maintains a high transmittance in the infrared band. This is of great significance for the application of LiMn2O4 thin films in information detection, electrochromic displays and the preparation of inorganic multiplex electrochromic materials.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB383.2

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