Analytical Methods
·
2024
·
IF 2.7
Huifeng Xu,Weihua Huang,Rui Pan,Ronglin Chen,Lili Wang,Yun Yu,Xihai Li,Xi Zhu
A stable dual-emission fluorescent system, R6G/Eu-MOF, was obtained by simple mixing Eu-MOF with fluorescent rhodamine 6G (R6G). This system not only achieved robust dual luminescence performance at 430 nm (Eu-MOF) and 555 nm (R6G) under single-wavelength excitation, but also endowed it significantly improved fluorescence stability. Orientin (OT), a bioactive traditional Chinese medicine (TCM) component, was found to efficiently quench the dual fluorescent emissions via the synergistic effect of dynamic quenching effect, photo-induced electron transfer and molecular interactions. Therefore, a rapid fluorescent assay for OT was developed based on the variations in fluorescence signals at 430 nm and 555 nm, as well as the alterations in the ratio between these two signals. This method can achieve highly sensitive determination of OT in the linear range of 1.1-220 µM, with a LOD of 0.26 µM at 430 nm and 0.16 µM at 555 nm (3σ/N). The R6G/Eu-MOF hybrid exhibits significantly lower detection limits and a broader linear range OT than either R6G or Eu-MOF alone. This work presents a simple strategy to improve the water stability of Eu-MOF, and also provides a rapid analysis of small molecule drug using a fluorescence approach based on dual-emission MOF hybrid system.
研究领域:
分析化学
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药物分析
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 8
·2995-3002
·
IF 6.4
Wenwei Lai,Chuanli Wu,Xiuxun Han
CsPbBr3 nanocrystals (NCs) exhibit great potential for various optoelectronic applications due to their excellent optoelectrical properties. However, the poor stability inherited from the ionic crystal structure limits their practical applications. Hence, coupling CsPbBr3 NCs with protective and functional materials for achieving superior properties is one of the current research challenges. Herein, three-dimensional hyperbranched structures of Eu-MOF were developed as effective frameworks coupled with CsPbBr3 NCs. Rich Eu-MOF morphologies including sheaf-like, dumbbell-like, and urchin-like ones were achieved in a controllable way via introducing an Al(Ac)3 additive. The crystal splitting growth mechanism was found to dominate the formation of hierarchical Eu-MOF structures, as evidenced by the time-dependent morphological evolution of an urchin-like Eu-MOF. In addition, acidic carboxylate salts (such as Al(Ac)3, Zn(Ac)2, Pb(Ac)2, Cu(Ac)2, Ni(Ac)2) effectively modulate the splitting of Eu-MOF crystal growth, which is deemed to be the synergistic effect of metal ions and acetate ions. Subsequently, a series of CsPbBr3/Eu-MOF composites were synthesized by pre-preparing various Eu-MOF hyperbranched structures, and they demonstrate excellent dual-emissive optical properties. A ratiometric fluorescence probe fabricated by encapsulating CsPbBr3 in the three-dimensional hyperbranched Eu-MOF structure exhibits remarkable sensitivity, good linearity, and high selectivity for DMF detection.
研究领域:
材料科学
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化学
·
纳米技术
·
光电
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分析化学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yingchun Gao,Yanmei Chen,Zhiyuan Li,Qi Lu,Yunyun Chen,Yangyang Jiang,Xiaoya Fang,Lei Song,Xiaoxia Mao
Antibiotic contamination is increasing and poses a major threat to the ecosystem. The development of effective and low-cost methods for the in-situ detection of ciprofloxacin (CIP) in environmental samples has become an important research hotspot. Here, we develop a smartphone-compatible visualization kit oriented for CIP detection based on metal–organic frameworks Eu-MOFs@hydrogel composites,which exhibits efficient and specific recognition of CIP and results in a change in fluorescence color from red to light blue. Besides, the concentration of CIP can be determined by RGB analysis on a smartphone with a wide linear range (0.002–50 μM) and a low detection limit (0.00137 μM). The assay kit also possesses good environmental adaptability and stability, showing excellent selectivity and anti-interference ability for 11 common veterinary drugs. Additionally, the recoveries of the sensing probe in chicken and duck manure samples ranged from 70.66 % to 112.2 % with the relative standard deviations (RSDs) within 1.88 %-5.53 %. These results indicate that the developed hydrogel portable smart detection kit has great potential for practical field testing of CIP.
研究领域:
环境科学
·
生物分析化学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 19
·7633-7640
·
IF 8.067
Haifeng Sha,Bing Yan
As the basic units of proteins, the importance of amino acids in organisms is self-evident and therefore detection of the concentration of amino acids is significant in monitoring human health. Herein, a dual-responsive Eu3+-functionalized metal–organic framework (MOFs) luminescent film (1@SA) was designed and prepared, which not only realizes the simultaneous detection of aspartic acid (Asp) and arginine (Arg) but also has the possibility of being applied in anti-counterfeiting. A portable film sensor is obtained through the cross-linking and solidification of Eu3+ ions and sodium alginate (SA) hydrogel containing uniformly dispersed MOFs. The MOF used in this work is a zinc metal–organic framework (ZnMOF) comprising uncoordinated carboxyl groups that can provide binding sites for Eu3+ ions. Moreover, it is found that the sensor shows unique fluorescence changes under the stimulation of an acidic environment. Therefore, the quantitative detection of Asp and Arg by 1@SA can be achieved, and optical anti-counterfeiting platforms are also designed according to the diversity of fluorescence changes. The new strategy proposed in this work may broaden the scope of lanthanide fluorescence films used in optical fields.
研究领域:
生物传感
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光学材料
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
MEASUREMENT
·
2023
·
IF 5.6
Xunlong Zhang,Quangan Cai,Ke Liu,Guilong Yan,Jingyu Chen,Yuanpeng Wu,Zhenyu Li,Li Wang,Han Li
Heavy metal pollutants seriously threaten people’s health. A sensitive, selective, and responsive method for the detection of heavy metal ions is necessary. Herein, flexible robust europium complex/cellulose acetate nanofiber (Eu/CA NF) luminescent membranes were prepared by the electrospinning method. The tensile length of this nanofiber membrane, which can be used in a variety of force scenarios, can be increased by 130% of its original length. These Eu/CA NFs showed unique specificity and good sensitivity in detecting Hg 2+ with its low limit of detection (LOD) of 3.09 μM and a specific recognition of Hg 2+ with a quenching rate of 97.32%. In addition, Eu/CA NF nanofibers were recyclable even after 50 times washing treatment. This study provides a convenient and effective super-sensitive detection thought for a trace amount of Hg 2+ in various water environments.
研究领域:
环境科学
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 37
·25681-25690
·
IF 3.9
Jie Liang,Ting Fan,Jian-tao Lü,Tianjie Guan,Ting-ting Deng,Bangyun Xiong
NaGdF4:Ce,Eu,Tb nanocrystals were successfully prepared by a one-step hydrothermal method with Ce3+ ions as sensitizers, Eu3+ and Tb3+ ions as activators, and polyethylenimine (PEI) as surfactants. Color-adjustable fluorescence emission was achieved by the energy transfer effect between rare earth ions. Blue fluorescent carbon quantum dots (CDs) with a double UV response under 254 nm and 365 nm excitation were synthesized by a one-step hydrothermal method. A hydrophilic NaGdF4:Ce,Eu,Tb/CD composite ink was prepared by an easy physical mixing method. Because of the electrostatic self-assembly effect, the color adjustable luminescence was achieved in a few seconds, and the white light emission with color coordinates of (0.32, 0.32) was obtained. A dual-mode luminescence anti-counterfeiting pattern was designed and achieved by excitation with ultraviolet light at 254 nm and 365 nm.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2024
·
IF 2.7
Moru Zhang,Chunyun Deng,Jing Chen,Shucai Liang
In this work, a hydrophilic Eu-based ratiometric fluorescence nanosensor (PAAC-Eu) was developed for Cu2+ ion detection in aqueous solution and imaging in living cells. The sensor was prepared via a simple one-step reaction at room temperature, leveraging the synergistic coordination of commercially accessible polyacrylic acid (PAA) and coumarin-3-carboxylic acid (CCAH) with Eu3+ ion. PAAC-Eu was easy to disperse in aqueous media and exhibited two characteristic emissions at 406 nm and 618 nm, respectively, upon excited at 350 nm. Cu2+ ion could bind with the free carboxyl groups in PAAC-Eu within 10 min leading to a decrease in the fluorescence at 618nm (I618), but negligible effect on the fluorescence at 406 nm (I406). Accordingly, a rapid, sensitive and selective method for detecting Cu2+ ion was established. By this method, Cu2+ ion assay could be completed within 30 min. A good linear relationship was obtained between I406/I618 and Cu2+ ion concentration at 0-20.0 μM (0-1.28 mg L-1) with the detection limit as low as 0.175 μM (11.2 μg L-1). The proposed method has been successfully applied to quantify Cu2+ ion in real water samples. Moreover, a portable paper-based sensor was exploited by loading PAAC-Eu in filter paper, by which the visual detection of Cu2+ ion could be achieved independent of large instruments. Finally, cell experiments have demonstrated the low cytotoxicity and good cell-permeability of PAAC-Eu, and it has been successfully used for ratiometric fluorescence imaging of Cu2+ ion in living cells.
研究领域:
生物化学
·
环境科学
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材料科学
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POROUS MATERIALS
·
2022
·Vol. 30
·期 3
·921-936
·
IF 2.523
Guangjian Wang,Hongyu Gao,Qingxi Cao
Mesoporous molecular sieves silica materials had been functionalized employing 3-aminopropyltriethoxysilane as the surface decoration agent by a post-synthesis method and Eu and Ti with different loading ratio were synchronously anchored on amino-functionalized silica framework by incipient wetness impregnation method, respectively. The structures of the synthesized samples were evaluated by means of X-ray diffraction, Fourier transform infrared spectroscopy, ultraviolet-visible spectra, scanning electron microscope, transmission electron microscope, X-ray photoelectron spectroscopy and solid-state 29 Si magic angle spinning nuclear magnetic resonance spectra. The results revealed that the highly ordered mesoporous two dimensional hexagonal structure and the mesoporous channel structure were well preserved and isolated tetrahedral surface Eu3+ and isolated [TiO4] or [HOTiO3] species were found to be grafted and highly dispersed in the amino-functionalized mesoporous framework. A significant enhancement in selectivity and conversion for the photocatalytic epoxidation of styrene has been achieved by synergistic effect based on surface ligand effect and electron density effect between Eu 3+ and Ti 4+ species on amino-functionalized mesoporous silica framework. The factors associated with the conversion of styrene and selectivity to styrene oxide such as the solvent, metal loading, the amount of NaOH, H 2 O 2 /Styrene, the amount of catalyst and reaction time were also investigated in details. The desired selectivity (84%) to styrene oxide and excellent conversion (32%) of styrene for the photocatalytic epoxidation of styrene with turnover frequency of 3.1 × 10 −4 s −1 were obtained using aqueous H2O2 as an oxidant in the presence of acetonitrile solvent under ambient temperature.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2022
·
IF 4.291
Jiannan Sun,Aizhao Pan,Ke Yan,Pan Zhang,Yinghao Chen,Wei Xiong,Xuehang Chen,Jun Hong
Metal-organic frameworks (MOFs) have shown great potential as a new platform for developing solid-state light-emitting temperature probes . Herein, we synthesized Eu-BTC (MOFs) with controllable nanowire and nanorod morphologies by changing solvents. Eu-BTC Nanowire was produced from DMF with a size of 15 µm and a 21.5 % photoluminescence quantum yield (PLQY), while the nanorods from H 2 O yielded with a size of 200 nm (PLQY=17.4 %). The Eu-BTC materials exhibited highly variable temperature properties depending on the morphology. Eu-BTC Nanowire from DMF presented better temperature dependence as a highly sensitive temperature probe owing to its higher linearity and more excellent temperature-dependent reversibility , which further demonstrated its potential for application as a temperature probe. While, the Eu-BTC nanorod from H 2 O showed a non-linear relationship with temperature and low temperature-dependent reversibility , making it unsuitable as a temperature probe. The morphologies-dependent luminescence sensing mechanism of Eu-BTCs and the heat conduction induced by surface defects mechanism were proposed. This work provides theoretical guidance for developing highly sensitive and non-contact temperature probes , especially for the morphology-dependent temperature probes.
研究领域:
材料科学
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纳米技术
·
温度传感
·
光学性质
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 21
·19247-19253
·
IF 2.195
Feng Li,Dong Chengli,Jiang Wenlian,Gu Xiaoling,Xiao Mengjia,Li Chenxi,Ning Zhanglei,Gao Daojiang
Hierarchically uniform three-dimensional europium-based metal–organic frameworks (Eu-MOFs) have been successfully fabricated via a facile and mild liquid precipitation method at room temperature. The morphology, structure, and composition of samples are well characterized by scanning electron microscopy, X-ray powder diffraction, fourier transform infrared spectroscopy, thermogravimetric analysis, and elemental analyses, respectively. These well-arranged Eu-MOFs architectures show red emission corresponding to the 5 D 0 / 7 F 2 transition of the Eu 3+ ions under UV light excitation. Remarkably, these Eu-MOFs samples exhibit clear “turn-off” quenching response for styrene vapors with high selectivity and reusability. This Eu-MOFs fluorescent sensor realizes fast recognition for styrene with a response time of less than 1 min at room temperature. Moreover, good detection reproductivity could also be achieved in this sensor. Considering the easy preparation, high selectivity and excellent repeatability, the sensor system provides a convenient and reliable detection of volatile organic compound in everyday applications.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PORPHYRINS AND PHTHALOCYANINES
·
2020
·
IF 1.816
Kiran Abdullah,Xia Kong,Muhammad Imran,Ghulam Mustafa,Yanli Chen
A new hybrid material has been developed by mixing a sandwich-type double-decker, Eu[Pc(OC 4 H 9 ) 8 ] 2 = 2,3,9,10,16,17,23,24-octabutoxyphthalocyaninate] with acidified multiwalled carbon nanotubes (aMWCNTs) through non-covalent interactions. The UV-vis spectrum, X-ray diffraction and scanning electron microscope have been employed to reveal the J -aggregate mode and optimized morphology of Eu[Pc(OC 4 H 9 ) 8 ] 2 molecules in the Eu[Pc(OC 4 H 9 ) 8 ] 2 /aMWCNTs hybrid material. The gas-sensing devices based on this hybrid material are fabricated by a simple solvent-processing quasi-Langmuir–Shäfer (QLS) progress. The n -type and p -type response is shown by the Eu[Pc(OC 4 H 9 ) 8 ] 2 /aMWCNTs hybrid film at room temperature. The detection limit of the hybrid for ammonia and nitrogen dioxide gas is 0.5 ppm and 0.3 ppm, respectively.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Jun Yao,Ming Xie,Yang Li
In order to protect human health from the threat of excessive acrylamide in heat-processed foods, swift, uncomplicated, highly selective and sensitive online monitoring methods for acrylamide are urgently needed. In this study, a rare earth metal/transition metal-organic frameworks Eu/Zr-MOFs fluorescence sensor with dual-band luminescence was prepared by the solvothermal method for detection of acrylamide in fried potatoes and cookie crumbs. This sensor exhibited two different fluorescence emission peaks at 430 and 615 nm under excitation of 365 nm, and the ratio of fluorescence intensity was linear with the experimental concentration of acrylamide in the range of 1 × 10 −4 to 1 × 10 −3 M. Under the optimal conditions, the proposed fluorescence analysis method showed that the detection limit of acrylamide was as low as 2.4 × 10 −8 M, and the satisfactory recoveries of 94.05–104.04% were obtained for various spiked samples. More importantly, the sensor has ultra-high selectivity for the detection of acrylamide while other small organic molecules hardly interfere with it in the measurement environment. These studies confirmed that the ratiometric fluorescence sensing method was expected to achieve on-line rapid detection of acrylamide in real foods. In addition, the mechanism of Eu/Zr-MOFs sensing of acrylamide was analyzed and discussed in depth, and the analog computation was carried out by Materials Studio software, and the entire sensing system was studied at the micro level in combination with density functional theory.
研究领域:
分析化学
·
食品安全
·
材料科学
✓ 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）