DYES AND PIGMENTS
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2019
·
IF 4.018
Long Ma,Sixuan Xiao,Nan Wu,Shan Zhao,Debao Xiao
In the field of electrochromism , multicolor systems have ever been explored due to their potential applications in areas such as electrochromic displays. In this work, two benzene-centered organic salts, 4,4′,4''-(benzene-1,3,5-triyl)tris(1-propylpyridylium) bromide TPP 3+ 3Br − and 4,4′,4''-(benzene-1,3,5-triyl)tris(1-benzylpyridylium) bromide TBP 3+ 3Br −, were successfully synthesized and further incorporated as electrochromic materials to fabricate gel based all-in-one electrochromic devices (ECDs), respectively. It was found that, the ECDs based on these two materials displayed multicolor electrochromic behaviors, optical contrast was unambiguously exceeded 67.9%, coloration efficiency was as high as 327.7 cm 2 /C, and coloring voltage was less than −1.2 V. Considering the overall electrochromic performances of the 1,3,5-tris(4-pyridylium) bromides, it is expected that the multicolor ECDs may be applicable in the development of electrochromic enhancement of latent fingerprint based on the principle of color contrast for those deposited on the conductive and nonconductive substrates with a series of colors.
研究领域:
材料科学
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电化学
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高影响因子
ACS Applied Materials & Interfaces
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2020
·
IF 8.758
Ya-Feng Liu,Qun Liu,Jun-Fei Long,Feng-Lian Yi,Yuan-Qing Li,Xiao-Hua Lei,Pei Huang,Bing Du,Ning Hu,Shao-Yun Fu
Inspired by chameleons’ structural color regulation capability, a simple, but effective, swelling method is proposed for the first time to prepare an ionic polyacrylamide (PAAm) organogel for simultaneous tactile sensing and interactive color changing. The PAAm organogel obtained by swelling the PAAm scaffold in the dimethyl sulfoxide solution of organic electrochromic material (OECM) shows an extremely large stretchability with an elongation of 1600%, a supersoftness with a compressive modulus of 7.2 kPa, an excellent transmittance up to 90%, and a very fast response time of 0.5 s combined with the characteristic of interactive color changing. The PAAm organogel also suggests a universal design ability to tailor coloration spectra for tactile sensors via simply changing the type and content of OECM. The tactile sensor based on a PAAm organogel is capable of serving as a wearable device for precisely tracing human body motion performance and directly visualizing the stress distribution via interactive color changing capability. It is demonstrated that the swelling method proposed here is a simple and practical strategy to prepare ionic organogels with both piezo-resistive and electrochromic effects.
研究领域:
材料科学
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生物仿生学
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传感器技术
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PubMed
高影响因子
MACROMOLECULES
·
2020
·
IF 5.918
Ningwei Sun,Kaixin Su,Ziwei Zhou,Daming Wang,Andreas Fery,Franziska Lissel,Xiaogang Zhao,Chunhai Chen
Electrofluorochromic (EFC) materials have gained extensive attention owing to their interesting modulations of fluorescence by an electric stimulus. However, the limited performances, especially the low fluorescence on/off contrast, significantly hampered their further applications. Herein, we design a new strategy to achieve high-contrast electrofluorochromism by combinations of “colorless-to-black” electrochromism and highly fluorescent AIE activity. Given the effective fluorescence quenching effect and high solid-state fluorescence, a fluorescence contrast of 838 is realized, to the best of our knowledge, the highest reported so far. Furthermore, to explore the structure–property relationships, we also separated the E/Z isomers of tetraphenylethylene (TPE) and studied the properties of the three electroactive/fluorescent polymers (11TPE-PA, E-12TPE-PA, and Z-12TPE-PA) derived from different TPE derivatives and isomers. The three branches of polymers all exhibited AIE-active and “colorless-to-black” electrochromic (EC) properties. In addition to the ultrahigh fluorescence contrast, Z-12TPE-PA also integrated high electrochromic contrast (Δ% T = 92%), short response time (0.6 s/0.3 s), and excellent switching stability (300 cycles), paving the way for the applications in various electronic applications. The study will provide novel insights into the future design and development of high-performance EC/EFC materials.
研究领域:
材料科学
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光学
·
有机化学
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高影响因子
Small
·
2023
·Vol. 19
·期 34
·2301886
·
IF 13.3
Yingchao Zhang,Xiaoteng Jia,Bolun Sun,Ruonan Huang,Ce Wang,Danming Chao
Electrochromic (EC) reflective displays offer great advantages in delivering information and providing visual data, but are limited in dark environments. Reflective/emissive dual-modal displays capable of electrochemically-induced color and fluorescence change simultaneously are highly desirable, especially possessing rapid response speed as well as long-term durability. Herein, an electroactive fluorescent ionic liquid based on triphenylamine and imidazole (EFIL-TPA) has been synthesized for reflective/emissive dual-modal display. The resultant device exhibits outstanding electrochromic/electrofluorochromic (EC/EFC) performance with low driving voltage (below 1.0 V), fast switching speed (0.57–1.8 s), and remarkable cycling durability (91% retention for 10 000 cycles). A piezoelectric nanogenerator (PENG) driven EC/EFC integrated system is fabricated to harvest energy from human motion and visually drive the color/fluorescence change for human motion indication in both bright and dark environments. This innovative EC/EFC dual-modal display device based on EFIL-TPA supports a huge space for the development of self-powered human motion visualized indication in all-light conditions.
研究领域:
材料科学
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显示技术
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能源转换
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电子工程
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高影响因子
DYES AND PIGMENTS
·
2023
·
IF 4.5
Peiyu Wu,Shengxiong Zhang,Wenjun Zhang,Weijie Song
Dual functional electrochromic (EC)/electrofluorochromic (EFC) materials play a pivotal role in wearable and smart electronic equipments. Developing new materials with high performance of EC/EFC properties is still a big challenge. Here a new D-A structure polymer PPDOTTPD based on thieno(3,4-c)pyrrole-(4,6)dione ( TPD ) was synthesized by Stille coupling, and the EC/EFC properties were investigated for the first time. PPDOTTPD film exhibits reversible color changes from purple neutral state to transparent colored state in the process of reversible redox. Photophysical and electrochemical studies revealed that the polymer has outstanding EC properties, including high optical contrast (52%), fast response time (0.5 s/0.7 s), high coloring efficiency (427.1 cm 2 C −1 ) and good stability. What's more, PPDOTTPD exhibited EFC phenomenon. PPDOTTPD film showed an intense red near-infrared fluorescence with a peak of 672 nm, which gradually doped with the increase of applied potential with a maximum contrast ratio of 12.9. The EC/EFC dual-functional device based on PPDOTTPD was also successfully fabricated, which exhibited high optical and fluorescence contrast. The fine dual-functional performance indicates TPD can be further explored as potential acceptors for synthesizing high performance D-A molecules for intelligent optical devices.
研究领域:
材料科学
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电子工程
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高影响因子
Materials Today Chemistry
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2021
·
IF 8.301
Y. Zhang,Y. Li,X. Jia,E.B. Berda,C. Wang,D. Chao
The electrochromic/electrofluorochromic (EC/EFC) dual-functional polymers have gained intense attention owing to the unique electrochemically induced absorption and emission change simultaneously. Most of the efforts have recently been devoted to improving their EC/EFC performance. However, the practical application studies of the EC/EFC polymers are still in their infancy. Herein, we present a poly(amic acid) based material bearing high solid fluorescence-efficiency AIEgens and electroactive oligoaniline groups, featuring a good electrochromic performance with desirable optical contrast, high coloration efficiency, and outstanding durability. This occurs in tandem with electrofluorochromic behavior with ideal fluorescence contrast and moderate switching speed. By virtue of the versatile electrospinning technique, we manufactured a nanofibrous test strip base on the resultant polymer for glucose determination. The colorimetric/fluorometric dual-determination of glucose is carried out with an obvious color change from gray to dark green, along with a drastic fluorescence change from light to dark, which exhibits numerous advantages of easy operation, rapid detection, favorable selectivity, and unique repeated use feature. Furthermore, the nanofibrous test strips also provide reliable results in the glycosuria test. This strategy shows distinct promise for future sensing applications.
研究领域:
材料科学
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生物医学工程
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分析化学
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Chang Xiao,Chengcheng Wang,Liping Zhang,Shaohai Fu
Electro- and thermochromic materials have been greatly applied in smart windows and displays due to the excellent properties of color variation and solar radiation. However, the mono color and single response to voltage and temperature hinder their application and development. Here, a multimode dynamic color-changing device (T/ECD) was developed by integrating the electrochromic property of synthetic viologen dyes and the thermochromic properties of hydroxypropyl acrylate (HPA). The T/ECD achieves four modes of optical regulation, namely, colorless transparent state, tinted transparent state, colorless opaque state, and tinted opaque state, which can be regulated independently/coordinately using heat and voltage. The optimized T/ECD switched color at 1.2 V with 15 s or adjusted the transparent/opaque state at >34 °C with 46 s. In addition, based on the red viologen (ViO-R), green viologen (ViO-G), and blue viologen (ViO-B) dyes, colorful T/ECDs were successfully designed and fabricated, and T/ECDs have excellent cycling properties, expanding the application requirement. Moreover, we demonstrated their application in smart windows and privacy protection. The design philosophy and successful exploration have great prospects for energy-saving buildings, displays, and information masking/storage systems.
研究领域:
材料科学
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能源技术
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建筑设计
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PubMed
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-10
·
IF 4.259
Zhu Xiaodong,Liu Yu,Dong Ningwen,Li Zhao
Leuco dyes are widely used as functional materials for their thermosensitive chromogenic nature. The influences of thermochromic compounds and impregnation processing conditions on thermochromic wood veneer properties were investigated in this paper. The thermochromic compounds included thermochromic dye (ODB-2), color developer (bisphenol A) and solvent (1-tetradecanol). To achieve the maximum color change, the optimum mixing ratio of ODB-2 to bisphenol A to 1-tetradecanol was 1:2:60. Juglans mandshurica veneers were ultrasonically impregnated with reversible thermochromic compound suspensions. Analysis of variance showed that the influences of impregnation parameters on veneer color change were significant at the 0.05 level. The optimum thermochromic wood veneer can be obtained by impregnating with a thermochromic compound suspension for 2.0 min at 65 °C. In this paper, the thermochromic properties of wood veneers were evaluated, and functional thermochromic veneers exhibited excellent properties and thermostability.
研究领域:
材料科学
·
林产化学加工工程
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PubMed
高影响因子
LIQUID CRYSTALS
·
2023
·
IF 2.2
Runwei Yu,Jinghua Zhao,Limin Wu,Yi Li,Wei Liu,Yonggang Yang
Colourful polymer-stabilised cholesteric liquid crystal (PSCLC) film attracted much attention for their applications in decoration and anti-counterfeiting. Herein, a chiral dopant was synthesised using trans-p-hexoxycinnamic acid. With the addition of this chiral dopant in a reactive LC mixture, both thermochromic and photochromic phenomena were found. The Bragg reflection band of the CLC mixture shifted to long wavelength with extending 365-nm UV light irradiation time or increasing temperature. The structural colour can cover the visible range. The photochromic property of the CLC mixture was driven by the photoisomerisation of the chiral dopant. Colourful PSCLC patterns were prepared based on the thermochromic and/or photochromic properties and using masks. The results shown here not only give us a better understanding the competition between photopolymerisation and photoisomerisation, but also lay a foundation for the preparation of the decorations.
研究领域:
材料科学
·
光学
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高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 24
·2301065
·
IF 9
Shanshan Song,Tingting Hao,Bo Wang,Dongqi Liu,Zichen Ren,Yike zhang,Wenchao Liu,Leipeng Zhang,Yao Li
Polyaniline (PANI) can achieve reversible optical modulation in visible and infrared (IR) bands under the action of voltage. However, PANI-based electrochromic devices cannot cope with the dual detection of visible and IR light to realize the transmission of information due to the linkage restriction between the spectral modulation in the visible and IR region. Here, IR low-absorptive inorganic pigments as colorants and IR high-transparent polymer as a binder are utilized to prepare colored films with high transparency. A camouflage layer against visible light detection is constructed on the surface of IR electrochromic devices, and the information transmission is realized in the IR band by controlling the thermal radiation characteristics. Furthermore, thermochromic microcapsules (TMs) that change color under external thermal stimuli are introduced to fabricate a thermochromic and IR transparent functional layer, which is attached to the surface of IR electrochromic devices and endows the devices with separate spectral modulation ability in the visible and IR region. Multicolored displays are fabricated by arraying various devices. Moreover, visual patterns are prepared on the surface of IR electrochromic devices by dispensing technology. This configuration endows the device with a promising potential for anti-counterfeiting, optical security, and related applications.
研究领域:
材料科学
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光学工程
·
信息传输技术
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高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Xiaoyu Shen,Zhaozhu Qu,Shuai Ding,Congkai Guo,Yao Liu,Xiaoyu Yao,Wenjuan Xia,Guohua Wu,Yaohong Zhang
Tungsten oxide (WO3), as a typical electrochromic material, is well-known for its high coloration efficiency, wide optical modulation range, and excellent cyclic stability. In this study, tantalum (Ta)-doped WO3 films were fabricated by using the sol–gel method. The effects of Ta doping on the morphology and oxygen vacancy concentration of WO3 films were systematically investigated, along with how these factors influence their electrochromic performance. The results demonstrate that Ta doping significantly enhances the optical modulation (82.9% at 750 nm), accelerates the response time (5.0 s for coloring and 4.5 s for bleaching), and improves the optical reversibility of WO3 films compared to undoped WO3 films. Remarkably, the Ta-doped WO3 films exhibit substantial optical modulation in both the visible and the near-infrared regions, achieving outstanding dual-band electrochromism.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Guangyuan Feng,Huicong Chang,Shujuan Tan,Lejun Qu,Tianyu Chen,Lin Xiao,Guangbin Ji
Carbon-based materials exhibit unrivaled ability to modulate electromagnetic waves in the infrared band. However, the black appearance restricts the application in the visible light camouflage. This work combines color coatings (consisting mainly of pigments and thermochromic microcapsules) with carbon-based devices and overcomes the high absorption of the color coatings in the mid-infrared band. Ultimately, the obtained white carbon film (W-CNT) device exhibits tunable thermal emissivity from 0.453 to 0.833, maintains a residual modulation range up to 71.7%. In addition, the expansion of the coloration layer to thermochromic microcapsules enables the devices to independently modulate the visible and mid-infrared spectra, further expanding the applicability. We believe that the carbon-based device is valuable for a wide range of applications in camouflage and personal thermal management, which may provide some ideas for designing multispectral independent modulation devices.
研究领域:
材料科学
·
光学工程
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高影响因子
危险品化学品经营许可证（带存储）