MICROPOROUS AND MESOPOROUS MATERIALS
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2022
·
IF 5.876
Yanbo Zhang,Quan Wang,Yongqiang Li,Ronggui Hu
Covalent organic frameworks (COFs) are promising in the detection and removal of toxic heavy metal ions from water. However, achieving detection and removal functions requires systematic control of stability, porosity, pore environment, and luminescence properties, which remains a challenge for most COFs materials. Herein, we develop a bithiophene-based stable COF, TAPA-BTDC, with dual functions of simultaneous detection and removal of silver ions from aqueous solution through elaborate structural design and control of the pore environment. The obtained TAPA-BTDC has good thermal stability and chemical stability, possesses high crystallinity and moderate specific surface area (396.83 m 2 /g), and contains dense bithiophene-S chelating sites on the pore walls. These characteristics work together to give TAPA-BTDC the dual function of selective detection and effective removal of silver ions from aqueous solution. This dual function can be attributed to the π-complexation between bithiophene-S chelating sites and silver ions, as verified by X-ray photoelectron spectroscopy. The charge transfer between bithiophene-S and silver ions alters the weak fluorescence emission caused by the π−π layered structure, enabling TAPA-BTDC to selectively detect silver ions through fluorescence enhancement, and even trace amounts of Ag + (2.4 × 10 −4 mmol/L) can cause observable fluorescence emission. Meanwhile, these bithiophene-S scattered across the pore wall also provide a large number of accessible chelating sites for TAPA-BTDC, enabling it to effectively remove Ag + with a maximum adsorption capacity up to 398.61 mg/g, and TAPA-BTDC can be easily regenerated five times without loss of performance. The results of this study reveal the exceptional potential of COFs with reasonably tailor-made structure in dealing with heavy metal ion contamination.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
SYNTHETIC METALS
·
2024
·
IF 4
Hailan Zeng,Ruomei Wu,Yanan Li,Haiyun Jiang,Xiang Wang,Weili Zhang,Ziyu Li,Jun Zhang,Zhengrong Yan
In this work, the copolymers were successfully synthesized by electrochemical polymerization of two monomers, bithiophene (BT) and 3,4-ethylenedioxythiophene (EDOT), in a lithium perchlorate/propylene carbonate (LiClO 4 /PC) solution. The as-prepared were characterized with the aid of cyclic voltammetry, colorimetric analysis, Fourier transform infrared spectroscopy, and Ultraviolet-visible spectroscopy. The electrochromic and colorimetric properties of copolymers poly(2,2′-bithiophene-co-3,4-ethylenedioxythiophene) (P(BT-co-EDOT)) and homopolymer poly(2,2′-bithiophene) (PBT) in 0.1 M LiClO 4 /PC solution were investigated, and the coloring process based on the redox reaction of the film was observed. When an anodic potential is applied, the copolymer P(BT-co-EDOT) films show a color change from blue-purple to blue-gray changes, and the homopolymer PBT shows a color change from orange to brown. In addition, spectroelectrochemistry studies indicate that copolymer P(BT-co-EDOT) has a lower optical band gap (1.73–1.87 eV) than homopolymer PBT. The copolymers P(BT-co-EDOT) show a high optical contrast (36.65–42.62%) and coloration efficiency (215.8–296.6 cm 2 C −1 ). The copolymer P(BT1-co-EDOT1) demonstrates excellent redox cycling stability, with 90% of the original optical contrast maintained after 500 cycles, making it an ideal candidate for copolymers.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Science China-Chemistry
·
2018
·Vol. 61
·期 10
·1301-1306
·
IF 4.448
Wang Sheng,Wang Fang,Li Chengpeng,Li Teng,Cao Derong,Ma Xiang
A novel multifunctional molecule BTE-CNPH was designed and synthesized by connecting 2-(3′,5′-bis(trifluoromethyl)-biphenyl-4-yl)-2-cyanovinyl group to both side of the bisthienylethene (BTE), which exhibited excellent aggregation-induced emission (AIE) and bistable photochromism. High-contrast (>60) reversible fluorescence switching was achieved in the 1D nanowires, solid of BTE-CNPH and also in a polymethyl methacrylate (PMMA) film loaded with 1% BTE-CNPH under the alternative irradiation by 365 nm and visible light. Interestingly, the nanowire-like assembly morphology of BTE-CNPH in aqueous tetrahydrofuran (THF) solution of specific concentration was observed to translate into amorphous pieces gradually upon prolonged irradiation by the 365 nm, accompanying with photo-tunable AIE emission.
研究领域:
材料化学
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光化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2011
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IF 3.65
Gang Wang,Xiangkai Fu,Jing Huang,Chuan Long Wu,Liu Wu,Jun Deng,Qiuliang Du,Xiaochuan Zou
Three double dithienylpyrroles derivatives have been successfully prepared by performing a Knorr–Paal condensation between 1,4-di(thiophen-2-yl) butane-1,4-dione and various aromatic diamines. Additionally, their corresponding polymer films were synthesized via electropolymerization. Their electrochemical, spectroelectrochemical and electrochromic behaviors were further investigated by thermogravimetric analysis, scanning electron microscopy, cyclic voltammetry, UV–vis absorption and fluorescence emission spectra. Scanning electron microscopy and thermogravimetric analysis demonstrated that the polymer films possessed homogeneous, compact and smooth layer structures and thermal stabilities (up to nearly 180 °C). Cyclic voltammograms and UV–vis absorption spectra studies showed that the polymer films have stable, well-defined, reversible redox processes, low optical band gaps ( E g < 2.2 eV) and multicolor electrochromic behaviors. Additionally, the fluorescence spectra study showed that all of the monomers and polymers exhibited different intensity emission bands at different wavelengths.
研究领域:
材料科学
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电化学
·
光学材料
✓ 已验证
DOI
高影响因子
CHEMISTRY LETTERS
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2025
·Vol. 54
·期 2
·
IF 1.1
Cao Yudi,Chen Qingshan,Wang Lei,Yang Mingqing,Zhang Shiyu,Niu Chunhui,Lv Yong
In this study, we develop a simple method for efficiently preparing poly(2,2′-bithiophene) flexible electrochromic devices. The poly(2,2′-bithiophene) films are fabricated in the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate. The poly(2,2′-bithiophene) films are characterized by Fourier transform infrared spectroscopy, scanning electron microscope, and ultraviolet-visible absorbance spectroscopy. The poly(2,2′-bithiophene) films exhibit electrochromic behavior, transitioning from an orange-red color in its reduced state to a dark green upon oxidation, particularly pronounced in the near-infrared region. Further studies demonstrate that poly(2,2′-bithiophene) films exhibits flexibility, allowing it to be bent and folded. This method for fabricating poly(2,2′-bithiophene) films shows promising potential for future applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2017
·Vol. 32
·期 4
·772-776
·
IF 0.447
Xiang Tao,Wang Qingxiu,Duan Lijie,Liu Fude
A conjugated polymer of poly(4,4'-bis(thien-2-yl)azobenzene-co-3-hexylthiophene) (PTAB-H), bearing azo group in main chain and soluble in THF, chloroform, was synthesized through FeCl3 oxidation copolymerization with 3-hexylthiophene, and the monomer of 4,4'-bis(thien-2-yl)azobenzene was synthesized by Sandmeyer reaction and Suzuki reaction. The UV-Vis spectra of PTAB-H reveal that azo group in the main chain can extend the absorption and lower the band gap. The fluorescent spectra, photoluminescence (PL) spectra, cyclic voltammetry (CV) of PTAB-H were recorded.The gel permeation chromatography (GPC), thermogravimetry analysis (TGA), and differential scanning calorimetry (DSC) measurements indicated that the molecular weight Mn, Mw and polydispersity indices (PDI) of the polymer are 10 876 g/mol, 22 338 g/mol and 2.05 respectively and the temperature of 5% weight-loss is 224.6 °C. No glass transition and crystallization melting peak was observed in the temperature range from 30 °C to 400 °C.
研究领域:
材料科学
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有机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Song Xiang,Shiquan Wang,Ganbing Zhang,Muhammad Sultan Irshad,Zhijun Ma,Ming Li
A conjugated microporous polymer (CMP) combining triazine and bithiophene units in the same framework is synthesized by a facile solvent-free one-pot method and employed as an anode material for lithium/sodium-ion batteries (LIBs/SIBs). It exhibits a large rate capability with a high reversible capacity for LIBs after activation, e.g ., 1014 mAh g −1 at 0.1 A g −1 and 486 mAh g −1 at a current density of 5 A g −1 with outstanding cycling stability. Meanwhile, it delivers perfect electrochemical properties for SIBs, featuring high reversible specific capacities of 425/260/156 mAh g −1 at 0.1/1/5 A g −1 . Especially, the CMP even outstrips most crystalline covalent organic frameworks (COFs) as SIB anodes at high current density. The lithium and sodium storage mechanisms of the CMP structural unit involve 11-electron redox reactions with four and three-step structure evolutions respectively, as follows from density functional theory calculations. The reported study demonstrates the CMP with redox-active electron donating units via triazine bonding as a promising electrode material for next-generation green sustainable energy storage devices.
研究领域:
材料科学
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能源存储
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2016
·Vol. 9
·期 9
·779
·
IF 2.728
Yingfei Hou,Lingqian Kong,Xiuping Ju,Xiaoli Liu,Jinsheng Zhao,Qingshan Niu
Two novel triphenylamine-based thiophene derivative monomers, 4-cyano-4′,4″-di(4-methoxythiophen-2-yl)triphenylamine and 4-methoxy-4′,4″-di(4-methoxythiophen-2-yl)triphenylamine, were successfully synthesized. The corresponding polymers including poly (4-cyano-4′,4″-di(4-methoxythiophen-2-yl)triphenylamine) and poly (4-methoxy-4′,4″-di(4-methoxythiophen-2-yl)triphenylamine) were electrochemically synthesized and characterized by multiple test method. The electrochemical measurements and spectroelectrochemical analyses revealed that both of the two polymers had quasi-reversible redox behavior and multi-electrochromic properties. The two polymer films showed reversible electrochemical oxidation, excellent optical contrasts in NIR region (62% at 1070 nm for the first polymer, and 86% at 1255 nm for the second polymer), satisfactory coloration efficiencies and fast switching times. The research on the application of the as prepared polymer in the fabrication of electrochromic device was also conducted, employing PCMTPA or PMMTPA as the anodically coloring materials.Keywords:4-cyanotriphenylamine;4-methoxytriphenylamine;bithiophenes derivatives;electrochromism;spectroelectrochemistry;electrochromic devices
研究领域:
材料科学
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电化学
·
高分子化学
·
光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Kai Mi,Sen Xiong,Yanqiu Lu,Yong Wang
Conjugated microporous polymers (CMPs) are a novel class of microporous materials highly regarded as exceptional building blocks for the fabrication of high-performance organic solvent nanofiltration membranes. However, preparing CMP thin films remains a challenge, primarily due to the formation of insoluble powders via traditional solvothermal synthesis. Here, we introduce the innovative oxidative molecular layer deposition (oMLD) method for the fabrication of robust CMP membranes utilizing 3,3′-bithiophene (33DT) monomers. The oMLD method enables the direct fabrication of CMP thin films on substrates of varying shapes and allows precise control over membrane structure and separation performance by simply altering the deposition cycles. Benefiting from the abundant micropores and highly cross-linked structure, the resulting CMP membranes facilitate rapid solvent transport and present size-dependent solute–solute separations. In applications involving high-value separations, the P33DT membrane proves effective for pharmaceutical separation in organic solvents. To the best of our knowledge, this work represents the pioneering instance of fabricating CMP membranes via oMLD, significantly broadening the available preparation methods and potential separation applications for CMP membranes.
研究领域:
材料科学
·
化学工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）