EUROPEAN POLYMER JOURNAL
·
2018
·
IF 3.741
Kun Wang,Hao Lu,BeiBei Liu,Jiping Yang
Polyurethanes STMPU and HTMPU containing AIE fluorogens in the soft segments and hard segments, respectively, have been synthesized and characterized. Both two resulting polyurethane solutions exhibited an aggregation-enhanced emission (AEE) feature. Then two kinds of polyurethane films were prepared and their multi-stimuli-responsive properties were explored. Interestingly, the fluorescence emission of two polyurethane films were decreased in high temperature, and polyurethanes with different structures have different temperature-dependent fluorescent behaviors. Meanwhile, weak emission was obtained when acetone was dripped onto the two polyurethane films. Moreover, the fluorescence of the polyurethane STMPU film was greatly enhanced with the increase of tensile stress (at ε < 0.3), suggesting its potential application in multifunctional fluorescent probes.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
FARADAY DISCUSSIONS
·
2016
·Vol. 196
·43-54
·
IF 3.544
Kun Wang,Jiping Yang,Chen Gong,Hao Lu
An amino-terminated poly(propylene glycol)-modified tetraaryl-buta-1,3-diene derivative (TABDAA) was introduced to synthesize polyurethanes with different ratios of soft/hard segments. A mixture of TABDAA and poly(tetrahydrofuran) 1000 as the soft segments was reacted with 4,4-diphenylmethane diisocyanate and 1,4-butanediol as the hard segments in molar ratios of 1 : 2 : 1, 2 : 3 : 1, and 3 : 4 : 1 to give the desired polyurethanes named TMPU-211, TMPU-321 and TMPU-431, respectively. The three polyurethanes exhibited different aggregation-enhanced emission (AEE) behaviors because of their different soft/hard segment ratios. The polyurethanes with a higher soft segment content tended to form bigger particles in a DMF/water mixture solution, thus causing a sharper increase in their fluorescence intensity. In addition, the polyurethane films exhibited different fluorescence intensities after different heat treatments. After a quenching treatment of the soft segments in the polyurethane films, the fluorescence intensity dropped greatly. When these quenched polyurethane films were thermally annealed at 60 °C for 24 hours, their fluorescence intensity exceeded the initial intensity of the as-prepared films. Differential scanning calorimetry results showed that the polyurethane films in the quenched condition did not present the endothermal melting peak of the soft segments, and the melting peaks appeared again after thermal annealing. AFM experiments showed that an ordered arrangement was achieved after the heat treatment of these AEE polyurethane films. These results demonstrated that the polymer structure had a significant effect on the AEE properties of the polyurethane films, and more importantly, it is of great significance in improving the fluorescence emission of the AEE polymers and also for their potential application in fluorescent probes, stimuli-responsive materials, PLED devices and so on.
研究领域:
材料科学
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化学
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产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2021
·Vol. 14
·期 7
·694-699
·
IF 2.896
Pengxiao Jia,Fu Wang,Wei Zeng,Zhaofeng Wang
Lubricating oils offers abundant information about the operating state of machines. In this work, a donor–acceptor aggregation-enhanced emission fluorescent molecule, (Z)-4-(1-cyano-2-(4-(diphenylamino)phenyl)vinyl)benzonitrile (CPA–TPA), was synthesized to investigate its function to sense the viscosity and polarity of lubricant base oils. The results indicated that the molecule showed steadily-increased fluorescence emission with the base oil viscosity. In a mixture of poly-α-olefin/ester base oils, its optimal emission gradually red-shifted with the ester oil fraction, i.e., the polarity of the lubricant. A good correlation could be established between the emission intensity of the probe and the oil viscosity or between the optimal emission wavelength and the oil polarity. This demonstrates a dual-response fluorescent probe used for lubricating oil analysis and opens a new opportunity to develop a molecule-based method for the evaluation of lubricating oil quality.
研究领域:
化学
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chemistry-An Asian Journal
·
2019
·Vol. 14
·期 6
·884-889
·
IF 3.698
Tingting Zhang,Zihao Zhao,Huili Ma,Yongming Zhang,Wang Zhang Yuan
Graphical Spatial relations : A pure organic luminogen (AN-MA) with isolated small conjugates and effective through-space conjugation was obtained through facile Diels–Alder cycloaddition. Owing to its flexible structure, two polymorphs were readily obtained. These exhibit bright visible emission and persistent room-temperature phosphorescence ( p -RTP) (see figure). Pure organic luminogens with persistent room-temperature phosphorescence ( p -RTP) have attracted increasing attention owing to their vital significance and potential applications in security inks, bioimaging, and photodynamic therapy. Previously reported p -RTP luminogens normally possessed through-bond conjugation. In this work, we report a pure organic luminogen, AN-MA, the Diels–Alder cycloaddition adduct of anthracene (AN) and maleic anhydride (MA), which possesses isolated phenyl groups and an anhydride moiety. AN-MA exhibits aggregation-enhanced emission (AEE) characteristics with efficiency of approximately 2 % and up to 8.5 % in solution and crystals, respectively. Two polymorphs of AN-MA were readily obtained that were able to generate UV emission from individual phenyl rings together with bright blue emission owing to the effective through-space conjugation. Moreover, p -RTP with a lifetime of up to approximately 1.6 s was obtained in the crystals. These results not only reveal a new system with both fluorescence and RTP dual emission but also suggest an alternative through-space conjugation strategy towards pure organic p -RTP luminogens with tunable emissions.
研究领域:
材料科学
·
有机化学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2017
·
IF 2.536
Xuefeng Wang,Hua Wang,Qin Jiang,Yong-Ill Lee,Shengyu Feng,Hong-Guo Liu
In this study, thiophene was linked to polybenzene to generate novel fluorescent probes , namely 3,4-diphenyl-2,5-di(2-thienyl)phenyl-trimethylsilane (DPTB-TMS) with a − SiMe 3 substituent and 3,4-diphenyl-2,5-di(2-thienyl)phenyl (DPTB) without the − SiMe 3 substituent, respectively. Both of the two compounds exhibit aggregation-enhanced emission (AEE) properties in tetrahydrofuran/water mixtures due to restricted intramolecular rotation of the peripheral groups, which make the two compounds good candidates for the detection of Fe 3 + ions in aqueous-based solutions. The fluorescence intensity of the two compounds decreases immediately and obviously upon addition of a trace amount of Fe 3 + , and decreases continuously as the amount of Fe 3 + increases. The fluorescence was quenched to 92% of its initial intensity when the amount of Fe 3 + ions reached 6 μmol for DPTB-TMS and to 80% for DPTB in the systems, indicating that the compound with the − SiMe 3 group is a more effective probe. The detection limit was found to be 1.17 μM (65 ppb). The detection mechanism is proposed to be static quenching. DPTB-TMS is highly efficient for the detection of ferric ions even in the presence of other metal ions . In addition, the method is also successfully applied to the detection of ferric ions in water, blood serum, or solid films. This indicates that these polybenzene compounds can be applied as low-cost, high selectivity, and high efficiency Fe 3 + probes in water or in clinical applications.
研究领域:
化学
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分析化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 5
·1927-1936
·
IF 6.4
Jian Sun,Yu-Lin Hong,Xiu-Qin Fang,Chang Wang,Cheng-Mei Liu
Herein, fluorescent phosphine oxide-containing hyperbranched polyesters (HBPs) were synthesized via the solvent-free polycondensation of 3-((4-((bis(hydroxymethyl)phosphoryl)methyl)phenethyl)thio) propanoic acid (BHPA) or its methyl ester derivative (MBHP) by adding trimethylolpropane as the core for the first time. As a clusteroluminogen (CLgen), the hyperbranched polyesters (HBPn, n = 1–4) carrying no conventional chromophores exhibited bright blue fluorescence under the irradiation of 365 nm ultraviolet light. This photoluminescence was attributed to the clustering of electron-rich moieties (i.e., CO, PO and OH). HBP2 in dimethylformamide showed clear concentration-enhanced emission (CEE) as well as excitation-dependent emission (EDE) characteristics. In addition, HBP2 was proved to be a selective and sensitive sensor for Fe3+ detection due to its good linearly fluorescence quenching response with a low detection limit (0.59 μM).
研究领域:
材料科学
·
化学传感
·
聚合物化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2021
·
IF 4.43
Xinzhu Sun,Danman Guo,Yifeng Cao,Faxu Lin,Huahua Huang,Zhiyong Yang,Yongming Chen,Zhenguo Chi
A series of mechanoresponsive fluorescence composite films were prepared by doping pyrene (Py) and its derivatives including 1-hydroxypyrene (HPY), 1-pyrenemethanol (PYM) and 1-pyrenylboronic acid (PBA) into thermoplastic polyurethane (PU) via physical blending, respectively. The fluorescence property of the composite films was found to be influenced by the polar group of pyrene derivatives and the content of hard segment of PU. The doped PYM showed a stronger trend to aggregate in PU matrixes, relative to other dyes. Contrary to PU/Py and most of previously reported mechanoresponsive materials, the emission intensity of aggregated PYM molecules in both PU25/PYM and PU50/PYM films exhibited a stretching-enhanced-emission feature. When PU25/PYM was stretched up to 500%, the intensity ratio of its dual emission peaks at 490 and 400 nm increased from 2.3 to 5.3. This interesting mechanoresponsive behavior was related to the formation of strong hydrogen bonding between PYM and hard segment of PU matrixes proved by FT-IR spectrograph. Enhancing instead of reducing the emission intensity of dyes through stretching would be remarkable in the field of mechanoresponsive materials.
研究领域:
材料科学
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聚合物化学
·
光学材料
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Qiuyue Sha,Bingyang Sun,Chen Yi,Ruixue Guan,Jian Fei,Zhaoyu Hu,Bifeng Liu,Xin Liu
In the past few decades, protein-templated fluorescent gold nanoclusters have attracted much attention in the field of biosensing as their excellent optical properties and good biocompatibility. In this work, a fluorescence turn-on biosensor was fabricated for the sensitive detection of 5-hydroxytryptamine (5-HT) with transferrin encapsulated gold nanoclusters (Tf-Au NCs). The Tf-Au NCs were facilely prepared with the assistance of microwave radiation in several minutes and exhibited good monodispersity as well as strong red-emission. It was demonstrated that an aggregation-enhanced emission of Tf-Au NCs was triggered by 5-HT due to the high affinity between 5-HT and the sialic acid (SA) residues of transferrin. Based on these findings, a highly selective turn-on fluorescent sensor was fabricated for the quantitative determination of 5-HT in the range of 0.2–50 μM (R 2 = 0.994) with a detection limit of 0.049 μM (S/N = 3). The developed sensor was also successfully applied for the 5-HT detection in human serum with satisfactory recoveries of 96.20–108.6%.
研究领域:
分析化学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 7
·2522-2530
·
IF 6.4
Qinbin Zhang,Chuan Huang,Shilu Huang,Haijiao Xie,Qing Huang,Mingming Guo
Luminogens without recognizable luminophores are attracting increasing attention owing to their particular photophysical properties and outstanding biocompatibility features. Despite rapid advances, it is still a formidable challenge to synthesize nonconjugated fluorescent materials with efficient near-infrared emission. Unlike traditional organic luminescent materials with long-range conjugation, the limited degree of electron delocalization and large energy gap are not favorable for long-wavelength emission. Herein, we observed universal intrinsic fluorescence formed from the mixtures of itaconic anhydride (ITA) and electron-rich solvents/monomers. Further, triethylamine (TEA) could promote the ring opening of ITA and subsequently generated the zwitterionic compound (I-TEA). The photophysical properties of I-TEA showed that I-TEA had the typical characteristics of concentration enhanced emission (CEE), excitation-dependent emission (EDF), temperature-sensitive emission (TSE), and efficient red emissions (λex = 585 nm, QY = 12.63%). The cytotoxicity assay indicated that I-TEA had low toxicity for MC3T3-E1 cells and was suitable for cell imaging. In addition, the PL properties and emission source of the mixtures of ITA and electron-rich solvents (DMSO and DMF) were preliminary investigated by NMR, fluorescence, and UV-vis spectroscopy techniques and theoretical calculations. This study reveals the general intrinsic fluorescence from mixtures of ITA and electron-rich solvents or monomers and provides a strategy for preparing nonconventional luminophores with efficient long-wavelength emission.
研究领域:
材料科学
·
光化学
·
生物医学工程
·
分析化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF PHYSICS
·
2021
·Vol. 23
·期 3
·033019
·
IF 3.732
Bingsuo Zou,Lipeng Hou,Ye Tian,Junbo Han,Hui Peng,Xiongtao Yang,Lijie Shi
The magnetic excitons in diluted magnetic semiconductor (DMS) have varied formats due to the inhomogeneous phases out of doping concentration and/or structural relaxations or defects. Here the high quality cobalt-doped zinc blende ZnSe nanoribbons (NRs) were synthesized, showing bright and color-variable emissions from blue, yellow to a little mixed white colors. Their power and temperature dependent micro-photoluminescence (PL) spectra have been obtained in which two emission bands, one magnetic exciton band near the band-edge and a Co2+ high-level d–d transition emission band at 550 nm out of their ferromagnetic (FM) coupled aggregates in ZnSe lattice, both bands could also be reflected by a nonlinear optical absorption enhancement. The easy formed stacking fault defects in a chemical vapor deposition (CVD) grown ZnSe zincblende NR took part in the above optical processes out of magnetic polaronic excitons (PXs). The femtosecond (fs) laser pulse pumping on single ZnSe:Co NR produces obvious lasing behavior but with profile of a complicated magnetic exciton interactions with indication of a crossover from collective exciton magnetic polarons (EMP) to bound magnetic polaron (BMP) scattering in Co doped ZnSe NR. These findings indicate the complication of the magnetic coupling natures in varied DMS structures, whose optical properties have been found to be highly nonlinear, due to the involvement of the spin–spin, spin–exciton and spin–phonon interactions, verified by the theoretic calculation in Yang X-T et al (2019 Interstitial Zn-modulated ferromagnetism in Co-doped ZnSe Mater. Res. Express 6 106121).
研究领域:
材料科学
·
光学
·
半导体物理
·
纳米技术
·
磁学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）