CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Ling Zhu,Yuqian Zhang,Shuai Chen,Zecheng Lin,Yuchen Zhang,Xiaowen Xie,Yongluo Qiao
Organic electrochromic conducting polymers (CPs) are at the forefront of flexible and ultra-thin display electronics. Solution processable poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) exhibits excellent electrical and electrochemical behavior in line with great processability, stability, and other promising properties. However, their uses are limited by the weak mechanical properties, wet instability, as well as inevitable conflicts among different functionalities and structural characteristics, etc. In this study, we designed and fabricated a high-mechanical-strength electronic “paper”, PEDOT:PSS/PEG-UPy film, employed a thermoplastic polyurethane poly(ethylene glycol)-2-amino-5-(2-hydroxyethyl)-6-methylpyrimidin-4-ol (PEG-UPy) using diverse processing (drop coating, spin coating, blade coating and 3D printing) of its “electric ink (E-ink)” from the mechanical mixture of its isopropanol (IPA) solution with aqueous PEDOT:PSS dispersion. Compared to PEDOT:PSS film, the incorporation of supramolecular chain-expanding unit 2-amino-4-hydroxy-6-methylpyrimidine (UPy) into the PEG-UPy molecular backbone resulted into optimized self-supporting (substrate-free) film of PEDOT:PSS/PEG-UPy(10 wt%) which showed great flexibility, enhanced mechanical strength (elongation at break 47.08 %, tensile strength of 19.16 MPa, toughness 7.973 MJ m − 3 ), considerable electrical properties (0.509 S cm −1 ), desirable physical properties including resistance to abrasion and solvent-wiping, and excellent surface-interface properties (e.g., hardness of 3H, adhesion of level 0, glossiness of 91). Its electrochromic capabilities include an optical contrast (ΔT) value of 67 %, a fast redox reaction (4 s and 3 s, respectively), and a coloring efficiency (722.19 cm 2 C −1 ). Similar to paper, they can be easily tailored or folded into a variety of forms, but have greater advances on dense morphology, flat surface, considerable optical transparency (79.5 %), as well as robust resistance to mechanical damage (in the case of bending, stretching, and folding, etc.), water (immersing > 150 days), and dirt. The combined effect of molecular design of PEG-UPy, abundant hydrogen-bonded cross-linking interaction and “good” solvent effect of IPA to PEDOT:PSS play important roles in this system. This is the first work on solution processable PEDOT:PSS-based electrochromic “paper” being able to meet much comprehensive performance requirements for the application in practical complex working environment.
研究领域:
材料科学
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化学工程
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柔性电子
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高影响因子
MATERIALS LETTERS
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2025
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IF 2.7
Yuan Zhuang,Yanhui Liu,Shirong Wang,Xianggao Li,Shuxian Meng
Electrophoretic particles enable image display in electrophoretic displays by migrating under an electric field. In this study, white hollow TiO 2 was synthesized via an improved template method, and colored hollow particles were obtained through pigment adsorption. The TiO 2 exhibited a charge of +78.08 mV and 92 % reflectivity, making it suitable for electronic paper applications. Magenta, yellow, and cyan hollow particles, all negatively charged with non-overlapping charge values, were formulated into dual-color electrophoretic suspensions. Under alternating voltage, color changes were achieved in magenta/yellow and yellow/cyan systems. This study offers new insights for dual-color and multi-color electrophoretic displays.
研究领域:
材料科学
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高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 16
·5490-5497
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IF 6.4
Xiaojing Lv,Xuchen Zhu,Ling Zhang,Mi Ouyang,Minao Xia,Chunyan Liu,Cheng Zhang
Polymer-based electrochromic materials have potential application prospects in the field of displays, but the lack of a highly transparent state to red/green/blue color state limits their development and commercial applications. Herein, it is proposed to design and synthesize photo-crosslinkable polymers based on different donor or acceptor groups modified phenothiazine or triphenylamine as electrochromic units and cinnamate as photo-crosslinking units. The influences of different donor or acceptor groups, such as phenyl and methoxy, on the electrochemical and spectroelectrochemical behavior of the polymers are clarified in order to achieve neutral, highly transparent states and red/green/blue colors in the oxidation states without the intermediate color state. The crosslinkable system inside the polymer changes its intrinsic soluble characteristic into a solvent-resistant property, thus resulting in a stable polymer film via the UV irradiation method. Hence, an all-solid-state electrochromic device was fabricated by separately utilizing three photo-crosslinkable polymer films as an electrochromic layer, which shows obvious reversible electrochromism with the “RGB” patterns, demonstrating it as a candidate for electronic paper and electronic tags.
研究领域:
材料科学
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高影响因子
Advanced Optical Materials
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2024
·Vol. 12
·期 20
·2400498
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IF 8
Rui Fang,Zhiyuan Bai,Xilu Wu,Qingchao Fan,Bingwei Bao,Chengyi Hou,Qinghong Zhang,Yaogang Li,Kerui Li,Hongzhi Wang
Reflective electrochromic (EC) technology is expected to e-paper display field, and integrating optical reflective electrolyte as the optical reflective layer is a common strategy for constructing reflective EC devices. Compositing inorganic particles and electrolytes is one of the simplest and most efficient composite methods, but these composite electrolytes usually cannot perform well together in terms of both optical and electrochemical properties. Herein, the TiO 2 nanoparticles are added to the ethyl viologen-based ionogel (T-EVG, one typical kind of EC/electrolyte) to have the highest visible light reflectivity and the best electrochemical performance compared with SiO 2 , Al 2 O 3 , and ZnO nanoparticles, which is attributed to the electro-induced self-reduction TiO 2 produced in T-EVG during EC cycling. Meanwhile, the corresponding EC devices can display red, green, and blue, and have high optical contrast (CIE Lab: ΔE>38), fast switching spend (<4 s, the fastest is 5 Hz), ultra-low power density (<4.0 mW cm −2 ), and excellent cycling stability (>85% retained after 10 000 cycles). Finally, a simple 3×3 pixelated EC display array is prepared, and single- and multi-point (including diagonal points) multi-color display effects are realized through active-matrix driving and high-frequency refresh, demonstrating its application value in the high-performance e-paper display.
研究领域:
材料科学
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高影响因子
危险品化学品经营许可证（带存储）