ELECTROCHIMICA ACTA
·
2012
·
IF 3.832
Jun Deng,Xiangkai Fu,Gang Wang,Liu Wu,Jing Huang
In order to develop novel electrochromic materials, four vinylbipyridinium derivatives (VBPDs) were synthesized. The structures of VBPDs were characterized as the vinyl derivatives of viologen by NMR, IR spectroscopy and APCI-MS. The electrochromic behaviors and electro-optical properties of VBPDs were investigated by thermogravimetric analysis, cyclic voltammetry and UV–vis absorption spectra. Moreover, a serial of environmentally friendly electrochromic devices (ECD) based on VBPDs were assembled successfully and their electrochromic performances were further studied. It was found that VBPDs in ECDs showed superior cycling stabilities and well-defined reversibilities, and clear color changes from colorless to magenta/pink during the potential ranges from 0 V (in the oxidized state) to ±1.5 V (in the reduced state). To sum up, the VBPDs synthesized are promising candidates for visible electrochromic devices, for their outstanding electrochromic behaviors plus short and oversimplified synthetic routes.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ORGANIC ELECTRONICS
·
2019
·
IF 3.495
Fu-han Liu,Ju Bai,Guang Yu,Fang-hong Ma,Yan-jun Hou,Hai-jun Niu
A series of novel polyazomethines containing EDOT and thiophene units coded as PEDOTs (PEDOT-TPA, PEDOT-TDD, PEDOT-THIO, PEDOT-APM) and PTHIOs (PTHIO-TPA, PTHIO-TDD, PTHIO-THIO, PTHIO-APM) were synthesized successfully. They were gained in short time, low cost and mild reaction conditions by a straightforward synthetic path. It can be easily found from the electrochemical properties of these polymers that the polymers containing 3,4-ethylenedioxythiophene (EDOT) unit (PEDOTs) have lower initial oxidation potentials as compared to the polymers containing thiophene unit (PTHIOs). Spectroelectrochemical properties reveal that all of the polymer films exhibit outstanding multielectrochromic behaviors, distinct color contrast and excellent electrochemical stabilities. Kinetic studies show that the PEDOT-TPA film has the shortest response time (a color switching time of 4.54 s and a bleaching time of 3.88 s at 428 nm) and the PEDOT-THIO film exhibits the highest CE of 343.56 cm 2 C −1 . Typical I-V characteristics of the ITO/plymer/Al memory devices exhibit that all the memory devices based on PEDOTs and PTHIOs exhibited nonvolatile flash memory characteristics, with an ON/OFF current density ratio of 10 3 -10 4 and low threshold voltages (around 1 V). Thus, these characteristics illustrate that these novel polymers have great potential in optoelectronics applications as electrochromic materials and memory devices.
研究领域:
材料科学
·
电化学
·
光学
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2013
·
IF 3.532
Yujian Zhang,Guilin Zhuang,Mi Ouyang,Bin Hu,Qingbao Song,Jingwei Sun,Cheng Zhang,Cheng Gu,Yuanxiang Xu,Yuguang Ma
Two isomers ( TPA-CNa and TPA-CNb ) consisting of twisted triphenylamine and cyanostilbene were synthetized by Knoevenagel condensation and C–N coupling reaction. The fluorescent colours of two isomers in crystalline state were sky-blue for TPA-CNa and green for TPA-CNb with quantum yields ( Φ f ) of 44.9% and 7.7%, respectively. The single crystal X-ray diffractometry revealed the fully different molecular conformations and packing modes of TPA-CNa (planar) and TPA-CNb (twisting), which might be the reason for different Φ f . The reversible mechanochromic and thermochromic fluorescence switching was observed in crystalline TPA-CNa powders. The sky-blue crystals were changed into the green-emissive solids after grinding , and they recovered their original state upon heating at 60 °C over 2 min. The reversible conversion of fluorescence colour was also realized by a pure thermal process. Powder X-ray diffractometry clearly demonstrated that the mechanochromic and thermochromic behaviour could be attributed to the crystal-to-amorphisation phase transition.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ChemElectroChem
·
2019
·Vol. 6
·期 20
·5293-5300
·
IF 3.975
Yan Zhou,Erik B. Berda,Qiang Ma,Xincai Liu,Ce Wang,Danming Chao
Graphical Lights, camera, action ! A novel flexible and robust electro-optical composite film is prepared from electroactive oligoaniline and fluorescence carbon dots through an electrochemistry-assisted hydrolytic crosslinking reaction. The resultant hybrid film displays interesting electro-optical properties including electrochromism, electrofluorochromism, and photocurrent responsiveness, all directly attributed to the inherent functionality and synergy derived from oligoanilines and carbon dots. We report a new electro-optical composite film based on silica, oligoaniline, and carbon dots prepared by a hydrolytic crosslinking reaction under electrokinetic potentials. The electroactive oligoaniline and fluorescent carbon dots are covalently linked through hydrolysis of siloxane, resulting in multifunctional composite films. The resultant crosslinked architecture endows the films with high flexibility and robust durability. These films display good electrochromic behavior with an obvious color contrast, quick switching rate, and acceptable cycling stability. Moreover, these films reveal an interesting electrofluorochromic performance in continuous potential ranges, attributed to the interaction between oligoaniline and carbon dots, and the change in structure that occurs with changing redox potentials. Further, an enhanced photocurrent response is observed in these materials, as a result of the organic-inorganic interfaces.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Wanan Cai,Xiaotong Wu,Tiandi Xiao,Haijun Niu,Xuduo Bai,Cheng Wang,Wen Wang,Yanhong Zhang
Herein, five kinds of soluble electrochromic polyarylates were synthesized from the reaction of N,N'-bis(4-carboxyphenyl)-N,N'-di-2-naphthyl-1,4-phenylenediamine with five bisphenols via direct polycondensation process, respectively. These new materials showed no significant decomposition below 400 °C in nitrogen atmosphere. The maximum UV–vis absorption bands of these polyarylates located at 328–348 nm and 327–353 nm for solid films and DMSO solution, respectively. The polyarylate 6a , as an example, exhibited not only aggregation-induced emission (AIE) effect in different fraction tetrahydrofuran/water solution, but also solvatochromism in various polar solvents, markedly. Two reversible pairs of distinct redox peaks were associated with noticeable color changed from original colorless to yellowish orange and green for polymeric film could be observed in the cyclic voltammetry (CV) test. New absorption peaks emerged in near–infrared (NIR) region with increasing voltage in the UV–vis spectra, which indicates these polyarylates can be used as NIR electrochromic materials. These polyarylates performed high contrast of optical transmittance change around 42–53% with the highest coloration efficiency up to 236 cm 2 C −1 .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Wood Material Science & Engineering
·
2023
·
IF 2.2
Weihua Zou,Zimu Li,Zhangheng Wang,Delin Sun
A blue thermochromic dye (B-TD) was prepared by mixing crystal violet lactone (CVL), hydroxyethyl acrylate (HEA) and myristic acid myristyl ester (MME). B-TD is a phase-changing material and can change colour at above 32°C about 5 s. The B-TD can permeate into pre-treated pinewood samples about 8–10 mm from the surface of samples after immersed pre-treated pinewood samples in B-TD for about 10 min at 70 °C. A blue thermochromic pinewood (B-TP) was prepared by filled the B-TD into pre-treated pinewood and covered polypropylene wax that can prevent B-TD overflowing from wood-based material when at phase-changing temperature. The B-TP can change colour from dark blue to light blue at 38–48°C, and can recover dark blue at below 38°C after about 5 h. B-TP can be used in a kind of pinewood woodwork that can indicate the temperature of woodwork surface to users by its colour-change phenomenon at 38–48°C, covering the lowest temperature of cryogenic burns (42°C), so this kind of pinewood woodwork can warn the temperature of cryogenic burns for avoiding cryogenic burns by its colour-change phenomenon.
研究领域:
材料科学
·
林业工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
Hongjian Huang,Yan Fang,Yunxiang Weng,Haiqing Liu
Wet/underwater adhesion is a matter of common occurrence to some marine organisms, but it is a quite thorny problem in practical engineering field and even in our daily lives. Meanwhile, preparation of an instantly available underwater adhesive with good adhesion strength is another great challenge. Herein, inspired by the oppositely charged polyelectrolytes coacervate of sandcastle worm glue, a zwitterion-based self-assembled underwater adhesive coacervate is reported. This coacervate can be deployed in real-time by mixing together of zwitterionic poly (HEMA-co-SBMA) (PHS), silicotungstic acid (STA) and arginine (Arg). It is an entirely new construction strategy via synergistical self-assembly of low- and high-molecular-weight zwitterions and polyanions by electrostatic force. The coacervate plays well in underwater adhesion to substrates such as organic plastic and inorganic ceramic. It also achieves outstanding performance in dry substrates, due to multiple interactions formed at the interface of adhesive coacervate and substrate. Moreover, this coacervate shows underwater sealing property and resistance to violent water flush. Additionally, the coacervate possesses electro/photo-chromic properties that may achieve stimuli-responsive color switching, therefore broadening its potential applications for external signals responsive devices like energy-efficient windows, wearable electronics, and warning devices.
研究领域:
材料科学
·
生物仿生学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 12
·2635
·
IF 5
Yanbo Zhao,Kai Zhao,Zhumin Yu,Changqing Ye
Flexible and stretchable electronic devices are indispensable parts of wearable devices. However, these electronics employ electrical transducing modes and lack the ability to visually respond to external stimuli, restricting their versatile application in the visualized human–machine interaction. Inspired by the color variation of chameleons’ skin, we developed a series of novel mechanochromic photonic elastomers (PEs) with brilliant structural colors and a stable optical response. Typically, these PEs with a sandwich structure were prepared by embedding PS@SiO2photonic crystals (PCs)within the polydimethylsiloxane (PDMS) elastomer. Benefiting from this structure, these PEs exhibit not only bright structural colors, but also superior structural integrity. Notably, they possess excellent mechanochromism through lattice spacing regulation, and their optical responses are stably maintained even when suffering from 100 stretching–releasing cycles, showing superior stability and reliability and excellent durability. Moreover, a variety of patterned PEs were successfully obtained through a facile mask method, which provides great inspiration to create intelligent patterns and displays. Based on these merits, such PEs can be utilized as visualized wearable devices for detecting various human joint movements in real time. This work offers a new strategy for realizing visualized interactions based on PEs, showing huge application prospects in photonic skins, soft robotics, and human–machine interactions.
研究领域:
材料科学
·
光学
·
生物仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Bo Zhang,Hui Wang,Zhuohua Liu,Naiye Zhao,Qiquan Zou,Yuanyuan Tian
Amorphous Bi–TiO 2 films with improved electrochromic properties have been successfully fabricated by a facile sol-gel spin-coating technology. The influence of dopant bismuth (Bi) content and sol amount on the electrochromic performance of Bi–TiO 2 films was studied. The optimized Bi–TiO 2 films show outstanding electrochromic properties, including wide transmittance modulation (ΔT = 74.26 % at 640 nm), short switching times (2.6 s/3 s for bleaching and coloring), and large coloration efficiency (52.77 cm 2 C −1 ). A proton-based electrochromic device was prepared by the amorphous Bi–TiO 2 film as the electrochromic film and Cu sheet as the counter electrode. The prepared device has a small operating potential range (1.0 V) in aqueous electrolyte due to the excellent electrochromic performance and high proton activity for the amorphous Bi–TiO 2 film. In addition, the device shows excellent performance (ΔT = 67.41 %, 2.5 s/3.9 s for bleaching and coloring), providing an important reference value for the development of high-efficiency electrochromic device.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Materials and Technologies
·
2025
·
IF 9.2
Zhiyi Guo,Tengfei Li,Hao Zhou,Changwei Tan,Ximei Wang,Shuhong Nie,Wenya Xu,Fangfang Pei,Xiuqing Meng,Xinzhou Wu,Xiaolian Chen,Wenming Su,Kai Zhao,Changqing Ye
Flexible electrochromic devices (FECDs) and electrochromic fabrics (ECFs) have attracted great attention in fashion clothing decoration and camouflage due to their low energy consumption and bi-stability. However, the complex and hierarchical structures of fabric substrates pose formidable challenges to the excellent and stable conductivity of ECFs. Here, we developed novel ECFs with excellent EC properties and outstanding stability by integrating FECDs with polyester fabric. Firstly, highly conductive silver (Ag)/nickel (Ni) mesh was heat-laminated on the thermoplastic polyurethane (TPU) film, serving as flexible electrode with high transmittance. On this basis, the FECDs exhibit an exceptionally high transmittance (46.4 %), rapid response time (bleaching for 0.5 s at 0.8 V and coloring for 0.9 s at −0.4 V), outstanding stability (2.6 % decreased after 5000 cyclic switching), and low-power consumption (<0.05 J per cycle in 60 cm 2 FECDs). By harnessing the thermoplastic property of TPU, the FECDs can be readily transferred to fabric for the realization of ECFs, without compromising their comprehensive performances. More importantly, the outstanding conductivity and mechanical stability of ECFs under various challenging conditions (mechanical bending, physical damage, etc.) are unparalleled. We believe the simple-structured high-performance ECFs would be promising for flexible smart textile in any textile-based markets, such as wearable and intelligence camouflage.
研究领域:
材料科学
·
纺织工程
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2024
·
IF 4.1
Jie Wen,Jin Tong,Ya-Lan Kou,Ji Wang,Shu-Yan Yu
Five tetraphenylethene (TPE) derivatives 1a , 1b , 2 , 3 , and 4 with adjustable stimuli-responsive characteristics were designed and synthesized in this study. Using single-crystal X-ray diffraction, the effects of substitution positions and pyrazolyl numbers on molecular packing were examined in the solid state. The findings indicate that as the pyrazolyl numbers increased, the molecular packing of the compound progressively changed from the C−H···π stacked compact mode in 1 − 3 to the X-crossing stacked loose mode in 4 , which results in the origin of various stimuli-responsive phenomena in compound 4 . This approach facilitates the preparation of multi-stimuli-responsive (thermochromism, mechanochromism, and metal ion fluorescence switch) smart fluorophores with tunable emission color. Moreover, compound 4, with an excellent fluorescence performance, exhibited three different colors when reversible mechanochromism was selected as the candidate for an optical recording material and security ink. This study proposes an effective method to guide the design of stimuli-responsive materials, which, in turn, would facilitate the development of high-contrast MC molecules, and the optical information anticounterfeiting based on grinding was proven by utilizing the grind-responsive luminescence capabilities.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 42
·20015-20023
·
IF 6.97
Pan Wu,Xiuqing Shen,Christian G. Schäfer,Jian Pan,Jia Guo,Changchun Wang
Shape memory photonic crystals (SMPCs) combining the main characteristics of shape memory materials and photonic crystals have drawn increasing research interest. In sharp contrast to traditional responsive photonic crystals, the temporary shape of SMPCs can be “frozen” and photonic configurations can be modulated by temperature. However, the large-scale fabrication of SMPCs still remains a big challenge, making the practical application difficult. Herein novel scalable SMPC films with both mechanochromic and thermochromic properties are reported. Unlike traditional template-based methods resulting in only a small size, SMPC films are fabricated by a facile hot-pressing method and post-photocuring technology to give large-area freestanding polymer films. The films are mechanically robust and flexible, featuring an excellent structural color which can be changed upon stretching, similar to the color change process of chameleons in response to the environment. The blue-shift of the reflection peak up to 120 nm can be observed when the film is stretched. The films can be reversibly stretched and recovered in 25 cycles without obvious changes in reflection spectra. The temporary shape accompanied by tremendous color changes in the corresponding SMPC films after mechanical stress induced hot programming could be simply fixed by cooling the structure below the glass transition temperature of the polymer matrix. Incorporated programmed optical properties could afterwards be erased by temperature, and initial optical properties could be fully restored. Based on the fully reversible programmable shape as well as optical properties, the investigated SMPC films are expected to be promising candidates for various potential applications, such as smart monitoring, sensors, anti-counterfeiting, and displays.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）