Smart Materials and Structures
·
2020
·Vol. 29
·期 4
·04LT02
·
IF 3.613
Liangliang Cao,Liang Fang,Xue Li,Shunping Chen,Chunhua Lu,Zhongzi Xu
Chameleons are attractive animals, which can change their colors because of unique layered skin structures. Inspired by this natural design, we explored a layer-by-layer assembly technique to create thermochromic films that can attain reversible and multiple-colors change. Briefly, inorganic pigments and two kinds of thermochromic microcapsules having different responsive temperatures were assembled sequentially onto a piece of filter paper using extraction filtration before epoxy resin was used to seal the whole structure. Different functions including colorful patterns and luminescent letters can be integrated into the system using this versatile approach. More importantly, arrays of thermochromic films were used with a detector and a heating-control circuit to trigger complicated color change by varying detected colors. We believe that this cost-efficient and convenient approach can be used in multiple applications such as camouflage, anti-counterfeiting, smart constructions and buildings, etc.
研究领域:
材料科学
·
仿生学
✓ 已验证
DOI
高影响因子
Results in Surfaces and Interfaces
·
2021
·
IF 0
Wenli Li,Jiangbo Sun,Jie Zhang,Olatoye Abiola Ganiyat,Yanbin Cui
Electrochromic smart devices with tunable optical properties are on the verge of replacing the conventional windows and curtains. The preparation and commercialization of electrochromic materials are majorly based on vapor phase deposition which is limited by high price and difficult production processes. Here, atomizing spray deposition process is developed for the production of large area, low-cost electrochromic film. W 18 O 49 , a promising inorganic EC material, was used to prepare EC film on indium tin oxide-polyethylene terephthalate (ITO-PET) flexible substrate. Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) was also printed on ITO-PET substrate to improve the conductivity of substrate and the adhesion between W 18 O 49 and substrate. The experimental results showed that the transmittance modulation ( Δ T) of W 18 O 49 /PEDOT:PSS/ITO-PET flexible EC film was 63.34% corresponding to a wavelength of 633 nm. The coloring and bleaching response times of W 18 O 49 /PEDOT:PSS/ITO-PET EC film were 18.7 s and 23.2 s, respectively. Furthermore, the as-prepared flexible EC film by atomizing spray deposition method had excellent cyclic stability, and the optical transmittance of the film still retains a high value (70%) after continuous coloring and bleaching for 6000 s.
研究领域:
材料科学
·
纳米技术
·
光电功能材料
✓ 已验证
DOI
Small
·
2019
·Vol. 15
·期 7
·1804974
·
IF 10.856
Na Li,Pingping Wei,Linan Yu,Junyi Ji,Jiupeng Zhao,Chuanbo Gao,Yao Li,Yadong Yin
The dynamic optical switch of plasmonic nanostructures is highly desirable due to its promising applications in many smart optical devices. To address the challenges in the reversibility and transmittance contrast of the plasmonic electrochromic devices, here, a strategy is reported to fabricate color switchable electrochromic films through electro-responsive dissolution and deposition of Ag on predefined hollow shells of Au/Ag alloy. Using the hollow Au/Ag alloy nanostructures as stable seeds for site-specific deposition of Ag, elimination of the random self-nucleation events is enabled and optimal reversibility in color switching is allowed. The hollow structure further enables excellent transmittance contrast between the bleached and colored states. With its additional advantages such as the convenience for preparation, high sensitivity, and field-tunable optical property, it is believed that this new electrochromic film represents a unique platform for designing novel smart optical devices.
研究领域:
材料科学
·
纳米科技
·
光学工程
·
功能材料
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2024
·Vol. 53
·期 5
·2656-2665
·
IF 2.2
Xiong Shanxin,Zhang Yukun,Zhang Wei,Yang Nana,Lv Fengyan,Guo Jingru,Cui Xin,Fang Ke,Chen Min,Wang Chenxu,Hua Chunxia,Zhang Runlan,Chu Jia,Xu Jianwei
Covalent organic frameworks (COFs) with reversible redox units and a conjugated molecular skeleton possess novel photoelectrochemical properties. In this work, tris(4-aminophenyl)amine and 4,4-biphenyldiformaldehyde were chosen to synthesize TABP-COF electrochromic film with triphenylamine (TPA) active unit by a solvothermal method in a Teflon-lined reactor. The growth process and reaction time optimization of the TABP-COF were studied. TABP-COF shows a self-assembly growth process from an array of nanosheets to nanospheres. Owing to the redox characteristics of TPA, the TABP-COF film exhibits reversible electrochromic behavior. With a solvothermal reaction time of 72 h, the TABP-COF-3 film exhibits the best electrochromic properties, including contrast of 0.483 and response time of 7.3 s/13.6 s. Considering the abundance of redox-active units that can be chosen, COF materials with different redox units and color changes can be designed for a variety of applications in the field of electrochromic materials.
研究领域:
材料科学
·
电化学
·
纳米技术
·
有机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）