JOURNAL OF FLUORESCENCE
·
2019
·Vol. 29
·期 6
·1285-1290
·
IF 1.913
Wen Qin,Liu Wanqiang,Zheng Yuhui,Gao Jinwei
In this study, the bio-inspired self-cracking substrate can be employed as a template to control the formation of a robust mirco-patterning film. Uniform materials with variable diameters are achieved by optimizing the egg white/water ratios and reaction temperature. The incorporated europium ions exhibit its typical f-f transitions in patterned films. Moreover, the mechanical property and excellent transmittance features have been demonstrated. The current approach can be extended to design two-dimensional nanofabrication of different materials.
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高影响因子
ACS Omega
·
2024
·
IF 3.7
Xin Zhao,Yishuai Jing,Zhonghua Dai,Yuanbo Chu,Zhenyu Liu,Yu Cong,Jiaming Song
As a wide-bandgap rare-earth oxide, Eu2O3 was often utilized as an auxiliary material of other photocatalysts because its photocatalytic performance was limited by the luminescence characteristics of Eu3+ and low light utilization. In this study, we improved the photocatalytic degradation performance of the Eu2O3 nanoparticles by doping with Fe cations. The Eu2O3 nanoparticles with different Fe-doping concentrations (1, 3, and 5%, noted as EF1.0, EF3.0, and EF5.0, respectively) were synthesized via chemical precipitation and calcination methods. It was found that doping could reduce Eu2O3’s bandgap, which probably originated from the introduction of oxygen vacancies with lower energy levels than the conduction band of Eu2O3. Compared with the undoped Eu2O3 nanoparticles with a removal efficiency of 22% for degrading rhodamine B dye within 60 min, the photocatalytic degradation efficiencies of EF1.0, EF3.0, and EF5.0 were demonstrated to be improved to 42, 48, and 33%, respectively, and EF3.0’s performance was the best. The enhanced photocatalytic performance of the doped samples was related to the oxygen vacancies acting as capture centers for electrons, such that the photogenerated electron–hole pairs were efficiently separated and the redox reactions on the surface of the nanoparticles were enhanced accordingly. Additionally, the enhanced light absorption and broadened spectral band further improved EF3.0’s degradation efficiency.
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APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Gaokuo Du,Huanrong Li,Zixuan Li,Xinchi Ye,Yige Wang
Quaternary ammonium/phosphine cations added to the platelets of Laponite clay can lead to the remarkable enhancement of luminescence efficiency of the europium (III) β-diketonate complex. The mechanism for the luminescence boosting by the organic cations was elucidated by comparing two diketonate ligands with different pKa and the pH value of the selected organic salts based on the stationery and time resolved spectroscopy. It can be concluded as that the presence of the quaternary ammonium or quaternary phosphine cations helps to form Eu 3+ -β-diketonate complexes with high coordination numbers by decreasing the acidic sites on the platelet surface of laponite clay. Our work further strengthens the simplicity and generalization of obtaining highly luminescent materials and provides a unique insight into the function of the quaternary ammonium/quaternary phosphine cations in boosting the luminescence of lanthanide-based organic-inorganic hybrid materials.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2012
·
IF 3.898
Hongliang Tan,Yang Chen
Metal-enhanced fluorescence (MEF) has shown a promising potential in fluorometric assays. In this work, the fluorescence of europium (Eu 3+ ) was enhanced by silver nanoparticles (AgNPs) through MEF effect in solution phase, which was applied to the detection of tetracycline (Tc). Tc can coordinate with Eu 3+ modified on the surface of AgNPs to form EuTc complex, which emits strong fluorescence due to an intramolecular energy transfer from Tc to Eu 3+ . The MEF effect of AgNPs further enhanced the emission of EuTc complex; the fluorescence of EuTc on the surface of AgNPs was 4 times higher than that of EuTc in a solution phase. The fluorescence intensity of this probe displayed a good linear response to Tc concentrations in the range of 10 nM to 10 μM with a detection limit of 4 nM, and was applied successfully to determine the levels of Tc in milk with a high selectivity . Compared with other fluorescent detection methods for Tc, the presented method allows simple, direct analysis for Tc without requiring fluorescence enhancement reagents or complicated prepreparation processes. This strategy of AgNP-enhanced fluorescence of lanthanide ions could be applicable to improving homogeneous assays of other molecules.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yating Wu,Lei Zhou,Yangyang Xie,Yaobin Lai,Shangwan Fu,Xingchen Kang,Wenhui Shi,Jian Li,Xuxia Zhang,Kang Hu,Hui Zhang,Tao Qi
Due to the superiority of decoupled energy and power, high safety, and design flexibility, redox flow batteries (RFBs) have gained much attention as candidates for large-scale electrochemical energy storage. However, the main redox flow batteries like iron-chromium or all-vanadium flow batteries have the dilemma of low voltage and toxic active elements. In this study, a green Eu-Ce acidic aqueous liquid flow battery with high voltage and non-toxic characteristics is reported. The Eu-Ce RFB has an ultrahigh single cell voltage of 1.96 V. The high concentration of electrolyte enables the full-cell energy density to reach 43 Wh/L. Even at the current density of 100 mA cm −2 over 100 cycles, the average coulombic efficiency, voltage efficiency and energy efficiency can reach 98 %, 84 %, and 82.4 %, respectively. In comparison with other reported representative redox flow batteries in recent years, the practical power density calculated at 80 % energy efficiency is at a leading level. These demonstrate the Eu-Ce RFB is a promising solution for green large-scale renewable energy storage.
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Device
·
2024
·
IF 0
Xue Ma,Bin Zhao,Pengfei Guo,Yalan Zhang,Jianheng Zhou,Lang Liu,Yu Zhang,Yuanyuan Zhou,Ning Wang
Preventing the formation of Sn-I defect pairs is of vital importance for the fabrication of stable and efficient Sn perovskite solar cells (PSCs). This has spurred intensive efforts, which leave a formidable challenge of simultaneously addressing the unfavored chemical activities of Sn 2+ and I − in Sn perovskites. Herein, we report a europium (Eu) redox-doping method that leverages the facile reactions between Eu 2+ , Sn 4+ , and I 0 in the acidic environment of perovskite solution and thus alleviates the Sn-I defect pair issue. Experimental and theoretical investigations suggest that Eu 2+ could enter Sn perovskite lattice, altering the geometric and electronic structures of [SnI 6 ] 4− octahedra. This could reduce the energy barrier for charge transfer along the inorganic framework. Sn-PSCs with Eu redox doping deliver power conversion efficiencies up to 13.66% and improved stabilities.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2020
·
IF 3.306
Yinsheng Xu,Xiaoxiong Zhang,Wenjun Zhang,Xin Liu,Qianqian Liu
Herein, we report an ammonia-responsive of lanthanide (Eu(Sal) 3 , Sal = salicylic acid) complexes hydrogel sensors based on the amine molecule affecting the energy transfer process. In this system, the ammonia stimulation causes the coordination and decomposition of Eu(Sal) 3 in the hydrogel, thus leading the fluorescence quenching and recovery of Sal in the ammonia atmosphere. Furthermore, the EuL n -Fm/PVA hydrogel composed of Eu(Sal) 3 and Eu(TTA) 3 complexes (TTA = 2-Thenoyltrifluoroacetone, L = Sal and TTA, Fm = formamide, n = 1-3) was prepared by an one-pot process, which achieves the continuous detection for ammonia gas. Meanwhile, EuL n -Fm/PVA hydrogel also achieved diverse responses for ammonia gas. This device could be a promising strategy for developing fluorescence hydrogels with potential applications due to its desirable advantages such as simple preparation, cost-effectiveness, etc..
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Jin Chen,Huiping Bai,Yande Li,Jiayao Zhang,Peng Liu,Qiue Cao
To solve the problem that the ion-imprinted membrane modified on glassy carbon electrode (GCE) usually easily falls off, a screen printed electrode (SPE) which has a relative rough surface than GCE, was selected as the base electrode for preparation of an ion-imprinted sensor for determination of Eu(III). The sensor was obtained by modifying SPE successively with carboxylic multiwalled carbon nanotubes (MWCNs-COOH) as signal amplifying element and Eu(III) ion-imprinted membrane (Eu(III)-IIM) as specific recognition material. To avoid damaging SPE by thermal initiation, the Eu(III)-IIM was prepared via radical photopolymerization at 380 nm using azobisisobutyronitrile (AIBN) as initiator. Differential pulse adsorptive stripping voltammetry (DPASV) was used for determination of Eu 3+ by the obtained sensor. After the detection condition was optimized in detail, the sensor showed a linear response to Eu 3+ in the concentration range of 1.0 × 10 −7 –1.0 × 10 −3 mol L −1 with the detection limit of 4.0 × 10 −8 mol L −1 . The obtained sensor possesses of good regeneration, stability and practicability, it can maintain more than 95% of its original response after used more than 30 times or stored in the water for two months. The satisfactory results with the relative standard deviation (RSD) of less than 3.5% ( n = 5) were obtained for the determination of europium in water samples by the novel sensor.
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高影响因子
ELECTROANALYSIS
·
2014
·Vol. 26
·期 12
·2710-2715
·
IF 2.502
Qi-Le Li,Ning Bao,Shou-Nian Ding
Phosphate anions are determined based on the electrochemiluminescence (ECL) of CdSe quantum dots (CdSe QDs) capped with 3-mercaptopropionic acid. The ECL gets quenched with the introduction of Eu 3+ ions, but it is restored on the further addition of phosphate anions. The sensing mechanism might be due to the strong and specific interaction between phosphate anions and the Eu 3+ ions, leading to the releasing of CdSe QDs from aggregates. On the basis of the quenching/recovery ECL behaviors, the ECL sensor offer acceptable sensitivity, high selectivity, and a linear response from 0.1 to 120 µM with a detection limit of 0.03 µM (3δ) for phosphate anions.
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高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Min Liu,Zhuoer Cai,Yang Xu,Jinzhong Hu,Baiwang Sun
Rare earth-based polystyrene (PS) fluorescent microspheres, which vigorously combine the merits of rare earth elements and polystyrene microspheres, hold great potential for applications in the state-of-the-art technology and tremendous efforts have been devoted to the photoluminescence field. Herein, a 5-acrylamido-1,10-phenanthroline (Aphen) and Eu(III)-based polystyrene fluorescent microsphere was developed via a facial copolymerization strategy. The optimal complexes of Eu(β-NTA)3(Aphen) and Eu(BFA)3(TPPO)2 were fabricated as the luminescent materials. Specifically, Eu(β-NTA)3(Aphen)-PS was modified for the first time to enhance the photoluminescence property, which effectively integrated the Aphen with styrene monomer. Meanwhile, Eu(BFA)3(TPPO)2 was encapsulated into PS microspheres for the realization of Eu(BFA)3(TPPO)2-PS via an ubiquitous embedding process. The fluorescent intensity of Eu(β-NTA)3(Aphen)-PS was notably reinforced along with an increasing concentration of the rare earth complexes. However, the fluorescence intensity of Eu(BFA)3(TPPO)2-PS was decreased when the concentration was 50 mg due to the saturated solubility of the complexes. The obtained copolymerization fluorescent microspheres could prevent the premature leakage of the fluorescent complexes in a natural environment and showed an outstanding photoluminescence efficiency.
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高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Yating Zhong,Keying Zhang,Xinru Wang,Haibo Liang,Ying Yu,Manli Guo,Yujuan Cao,Bixia Lin
It is important to develop sensitive and accurate methods for the detection of tetracycline (TC). For this purpose, a dual emission probe Eu-DPA/BDC-(OH) 2 was developed based on the green fluorescence of the ligand 2, 5-dihydroxyterephthalic acid (BDC-(OH) 2 ), and the red fluorescence of Eu 3+ sensitized by another ligand 2, 6-pyridine dicarboxylic acid (DPA). TC was able to quench the fluorescence of ligand BDC-(OH) 2 at 545 nm by the internal filter effect (IFE), and coordinate with Eu 3+ to enhance the fluorescence at 625 nm by the antenna effect (AE). I 625 /I 545 showed a linear relationship with TC concentration with an LOD at 55 nM. At the same time, the fluorescence color of Eu-DPA/BDC-(OH) 2 changed from green to yellow to red with the increase of TC concentration. On this basis, the RGB method was also developed for the visual detection of TC with an LOD at 0.2 μM. These methods have been successfully applied for the detection of TC in fish feed and pork with recovery rates of 93 % -110 %, indicating excellent applicability in the detection of real samples.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 15
·e55213
·
IF 2.7
Yu Zhao,Manoj Puthia,Seong-Min Jo,Juan Guan,Mingjie Liu,Sujun Wu
Biocompatible, tough, and photoluminescent hydrogels are highly desirable for biomedical applications in vivo. Herein, hybrid hydrogels prepared from silk fibroin (SF) and polyacrylic acid (PAA) and complexed with europium, named as SF-PAA-Eu 3+ hydrogels, exhibit good comprehensive properties. Owing to the intensive molecular interactions among SF, PAA, and Eu 3+ , SF-PAA-Eu 3+ hydrogels show a greatest tensile strength of 0.58 MPa, elongation of 443%, and work of fracture of 1.65 MJ/m. In vivo imaging experiment in a mouse subcutaneous implantation model revealed excellent and sustained photoluminescence of the SF-PAA-Eu 3+ hydrogels for 24 h. The work provides a strategy for designing functional SF-based hydrogels for imaging applications in vivo.
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