壳聚糖辅助制备WO3薄膜材料及其电致变色性能

doi:10.7503/cjcu20150176

高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (6): 1202.doi: 10.7503/cjcu20150176

壳聚糖辅助制备WO₃薄膜材料及其电致变色性能

刘树萍^1,²(), 刘益春², 王薇¹

1. 哈尔滨商业大学旅游烹饪学院, 化学中心, 哈尔滨 150076
2. 东北师范大学物理学院, 紫外光发射材料与技术教育部重点实验室, 长春 130024

收稿日期:2015-03-03 出版日期:2015-06-10 发布日期:2015-05-06
作者简介:联系人简介: 刘树萍, 女, 博士, 讲师, 主要从事无机材料的制备及电致变色研究. E-mail:liusp201@163.com
基金资助:
国家自然科学基金(批准号: 21301041, 31201376)和哈尔滨商业大学博士科研启动项目(批准号: 12DW030)资助

Chitosan-assisted WO₃ Ultrathin Film and Electrochromic Performance^†

LIU Shuping^1,^2,^*(), LIU Yichun², WANG Wei¹

1. Chemistry Center, College of Tourism and Cuisine, Harbin University of Commerce, Harbin 150076, China
2. Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education,Northeast Normal University, Changchun 130024, China

Received:2015-03-03 Online:2015-06-10 Published:2015-05-06
Contact: LIU Shuping E-mail:liusp201@163.com
Supported by:
† Supported by the National Natural Science Foundation of China(Nos.21301041, 31201376) and the Harbin University of Commerce Doctor Start-up Fund Research of China(No.12DW030)

摘要/Abstract

摘要：

以壳聚糖(CS)为辅助材料, 利用层层自组装方法(LbL)制备了WO₃复合薄膜材料(CS/WO₃). 采用紫外-可见吸收光谱(UV-Vis)、扫描电子显微镜(SEM)和循环伏安扫描(CV)等手段对CS/WO₃纳米复合材料的形貌和电化学性能进行了表征. 利用电化学和UV-Vis联机技术研究了复合材料的电致变色性能. 结果表明, 该复合材料呈现出从无色到蓝色的颜色调变, 其光反差可达48.0%, 着色效率为58.5 cm²/C, 着色与褪色时间分别为9.5和1.8 s.

关键词: 三氧化钨(WO3), 壳聚糖, 层层自组装, 电致变色性能, CS/WO3纳米复合薄膜

Abstract:

A nanocomposite material consisting of WO₃ and chitosan(CS) was fabricated by layer-by-layer(LbL) method in which CS was used as the additional component. The morphology and electrochemical behavior of the composite film were investigated by UV-Vis spectra, scanning electron microscopy(SEM) and cyclic voltammograms(CV). The electrochromic properties of the film were performed by in situ UV-Vis spectroscopy and electrochemical station. The results showed that the composite film was found to switch from colorless to deep blue, with the optical contrast of 48.0% and coloration efficiency of 58.5 cm²/C. Furthermore, the switching times were 9.5 s for coloration and 1.8 s for bleaching. Obviously, chitosan plays an important role in enhancing electrochromic performance of WO₃-based material.

Key words: WO3, Chitosan, Layer-by-layer, Electrochromic performance, CS/WO3 nanocomposite film

中图分类号:

O631

TrendMD:

刘树萍, 刘益春, 王薇. 壳聚糖辅助制备WO₃薄膜材料及其电致变色性能. 高等学校化学学报, 2015, 36(6): 1202.

LIU Shuping, LIU Yichun, WANG Wei. Chitosan-assisted WO₃ Ultrathin Film and Electrochromic Performance^†. Chem. J. Chinese Universities, 2015, 36(6): 1202.

图/表 8

Fig.1 Formation of a [CS/WO3] film

Fig.2 UV-Vis absorption spectra of [CS/WO3]n (n=1—20) filmInset: plots of the absorbance values for quartz supported [CS/WO3]n composite films at 195 nm.

Fig.3 Top-view SEM(A) and cross-sectional SEM(B) images of [CS/WO3]20 films on a FTO glass

Fig.4 CV curves of the [CS/WO3]20 film at scan rate of 20—100 mV/s(A) and CV curves of [CS/WO3]20 and [PEI/WO3]20 films at scan rate of 100 mV/s(B)Inset of (A): the relationship of the peak currents as a function of scan rate; a. cathodic peak current; b. anodic peak current.

Fig.5 UV-Vis spectra of [CS/WO3]20 film under different potentials(A) and comparison between the UV-Vis spectra of [CS/WO3]20 and [PEI/WO3]20 films(B)

Fig.6 Potential(A), transmittance change(B), chronoamperometry curves(C) and coloration efficiency(D) at 800 nm of [CS/WO3]20 film during subsequent double-potential steps(-1.5 and 1.5 V)

Table 1 Optical contrast, switching times and coloration efficiency of [CS/WO3]n(n=10, 15, 20) and [PEI/WO3]20 films during subsequent double-potential steps(-1.5 and 1.5 V)

Sample	ΔA	ΔT(%)	t_c/s	t_b/s	CE/(cm²·C^-1)
[CS/WO₃]₁₀	0.08	16.7	2.0	0.9	46.9
[CS/WO₃]₁₅	0.28	37.1	6.1	1.7	49.8
[CS/WO₃]₂₀	0.43	48.0	9.5	1.8	58.5
[PEI/WO₃]₂₀	0.16	17.2	5.4	1.4	32.8

Fig.7 Cycle stability of [CS/WO3]20 film at 800 nm for the double potential stepping at 1 cycle(a), 100 cycles(b) and 200 cycles(c)

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壳聚糖辅助制备WO₃薄膜材料及其电致变色性能

Chitosan-assisted WO₃ Ultrathin Film and Electrochromic Performance^†

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