导电咔唑基和硫异靛蓝基COFs具有快速稳定的电致变色性能

IF 4.8 Q2 NANOSCIENCE & NANOTECHNOLOGY
Katharina Muggli, Laura Spies, Derya Bessinger, Florian Auras and Thomas Bein*, 
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引用次数: 0

摘要

基于噻吩并噻吩并噻吩(ttTII)的共价有机框架(COFs)已被证明具有低带隙和有趣的光学和电致变色特性。到目前为止,只有一种基于噻吩并噻吩并噻吩的四方COF显示出稳定快速的电致变色和良好的显色效率。我们已经开发了两种新型的COF,使用这种具有四方和六边形框架几何形状的通用且几乎线性的ttTII构建块,以展示其在基于噻吩并异吲哚的COF的光电应用中的吸引力。两种COF都表现出良好的导电性,表现出有希望的光学吸收特征,具有氧化还原活性,并且在施加外部电刺激时表现出强烈的电致变色行为,将光学吸收进一步转移到电磁光谱的NIR区域,并实现高达2.5OD的吸收变化。具有不同氧化和还原波的循环稳定循环伏安图在200次循环中显示出优异的可逆性和电致变色切换,并证实了框架的高稳定性。此外,在550nm激发下,观察到NIR区域的高着色效率和Cz-ttTII COF的着色/脱色的快速切换速度快至0.75s/0.37s和TAPB-ttTII COF的0.61s/0.29s,优于许多已知的电致变色材料,并为各种应用提供了选择,如刺激响应性涂层,光学信息处理或热控制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Electrically Conductive Carbazole and Thienoisoindigo-Based COFs Showing Fast and Stable Electrochromism

Electrically Conductive Carbazole and Thienoisoindigo-Based COFs Showing Fast and Stable Electrochromism

Thienothiophene thienoisoindigo (ttTII)-based covalent organic frameworks (COFs) have been shown to offer low band gaps and intriguing optical and electrochromic properties. So far, only one tetragonal thienothiophene thienoisoindigo-based COF has been reported showing stable and fast electrochromism and good coloration efficiencies. We have developed two novel COFs using this versatile and nearly linear ttTII building block in a tetragonal and a hexagonal framework geometry to demonstrate their attractive features for optoelectronic applications of thienoisoindigo-based COFs. Both COFs exhibit good electrical conductivities, show promising optical absorption features, are redox-active, and exhibit a strong electrochromic behavior when applying an external electrical stimulus, shifting the optical absorption even farther into the NIR region of the electromagnetic spectrum and achieving absorbance changes of up to 2.5 OD. Cycle-stable cyclic voltammograms with distinct oxidation and reduction waves reveal excellent reversibility and electrochromic switching over 200 cycles and confirm the high stability of the frameworks. Furthermore, high coloration efficiencies in the NIR region and fast switching speeds for coloration/decoloration as fast as 0.75 s/0.37 s for the Cz-ttTII COF and 0.61 s/0.29 s for the TAPB-ttTII COF at 550 nm excitation were observed, outperforming many known electrochromic materials, and offering options for a great variety of applications, such as stimuli-responsive coatings, optical information processing, or thermal control.

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来源期刊
ACS Nanoscience Au
ACS Nanoscience Au 材料科学、纳米科学-
CiteScore
4.20
自引率
0.00%
发文量
0
期刊介绍: ACS Nanoscience Au is an open access journal that publishes original fundamental and applied research on nanoscience and nanotechnology research at the interfaces of chemistry biology medicine materials science physics and engineering.The journal publishes short letters comprehensive articles reviews and perspectives on all aspects of nanoscience and nanotechnology:synthesis assembly characterization theory modeling and simulation of nanostructures nanomaterials and nanoscale devicesdesign fabrication and applications of organic inorganic polymer hybrid and biological nanostructuresexperimental and theoretical studies of nanoscale chemical physical and biological phenomenamethods and tools for nanoscience and nanotechnologyself- and directed-assemblyzero- one- and two-dimensional materialsnanostructures and nano-engineered devices with advanced performancenanobiotechnologynanomedicine and nanotoxicologyACS Nanoscience Au also publishes original experimental and theoretical research of an applied nature that integrates knowledge in the areas of materials engineering physics bioscience and chemistry into important applications of nanomaterials.
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