Corrosion Communications
·
2023
·
IF 0
Xiaoping Lai,Jie Wang,Xin Wang,Kuo Jiang,Weizhi Tian,Baowen Xu
YSZ:Eu powder was prepared by sol spray pyrolysis method. Thermal barrier coatings (TBCs) composed of Eu 3+ -doped pure tetragonal yttrium-stabilized zirconia (namely, YSZ:Eu) were fabricated by air-plasma spraying technique. Crystal structure and fluorescence intensity of YSZ:Eu coating were investigated after aging at 1200 °C for 5 − 100 h. X-ray diffraction (XRD) indicates that tetragonal phase in YSZ:Eu coating had high resistance to degradation over a wide range of time periods and temperatures. Luminescence results indicate that asymmetry ratios of the fluorescence emission spectra were stable in a range of 1.2 ± 0.2. Relationships between phase structure and lattice distortion were further studied by fluorescence spectroscopy measurement using I 606 / I 590 intensity ratio. The fluorescence results were consistent with those drawn by XRD, where the high stability of YSZ:Eu coating was confirmed. Excellent thermal stability, in terms of both the phase structure and luminescence intensity, of YSZ:Eu coating indicates that the present preparation method is suitable for phosphor powder applications.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Rong-Mei Kong,Na Liang,Shixiao Guo,Xinyue Ge
Ratiometric fluorescent sensors, which enable self-referencing quantitative analysis through dual-emission signals, have received significant attention and are widely used in clinical diagnosis, food testing, and environmental monitoring. Herein, a dual-emission europium metal-organic framework (EuMOF) sensor was developed for the sensitive ratiometric fluorescence detection of the anthrax biomarkers, 2,6-pyridinedicarboxylic acid (DPA). EuMOF was synthesized using 2-aminoterephthalic acid (BDC-NH 2 ) and 1,10-phenanthroline (phen) as ligands, with Eu 3+ ions as metal nodes. The EuMOF exhibited dual-emission fluorescence from both the ligands and Eu 3+ ions. Upon DPA addition, the Eu 3+ fluorescence was restored via coordination with carboxyl oxygen atoms, while the ligand fluorescence is quenched, leading to a ratiometric fluorescent response. The sensor displayed high sensitivity, with a detection limit of 330 nM, and excellent selectivity for DPA over other common ions and molecules. As the DPA concentration increased, the fluorescence color shifted from blue to purple-red, enabling visual detection of DPA. Recovery tests using real samples yielded satisfactory results, confirming the practicality of the EuMOF sensor for DPA detection. This study provides a novel, convenient, and sensitive method for detecting anthrax biomarkers, with potential applications in environmental monitoring and biosecurity.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Junyang Shu,Jiacheng Li,Peidong He,Jinshuo Yang,Wenlong Li,Ji Wang,Xiangbiao Yin,Lifeng Chen,Yuezhou Wei
With the growing demand for europium (Eu) in advanced fields such as opto-electronics and nuclear technology, developing efficient extraction methods has become increasingly crucial. This paper focuses on the electro-extraction of europium in LiCl-KCl molten salt, employing Sn and Sn Zn electrodes. The electrochemical behavior of Eu(III) on the Sn electrode in the molten salt system was investigated through cyclic voltammetry (CV), square wave voltammetry (SWV), chronoamperometry (CP), and open circuit chronopotentiometry (OCP) techniques. The results reveal that the reduction of Eu(III) to Eu occurs Eu(III) + e − → Eu(II) and Eu(II) + 2e − + mSn → EuSn m . Furthermore, the electrochemical behaviors of LiCl-KCl-ZnCl 2 -SnCl 2 on the W electrode revealed a peak for the Zn-Sn-Eu alloy. The exchange current density and reaction activation energy of Eu(II)/Eu were calculated on the liquid Sn and Sn Zn electrode through the polarization curve. Subsequently, constant current electrolysis was carried out using Sn and Sn Zn electrodes to extract Eu, and the extraction effect of Eu using a Zn Sn electrode is far superior to that using a Sn electrode. The extracted products were characterized via Scanning Electron Microscopy-Energy Dispersive X-ray Spectroscopy (SEM-EDS) and X-Ray Diffraction (XRD), and the concentration of Eu(III) in molten salt at different times was detected by Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) and the extraction efficiency under different conditions was calculated and the valence state changes of Eu during electrolysis on different electrodes were analyzed using X-ray photoelectron spectroscopy (XPS).
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2025
·
IF 3.2
Xie Zhuojia,Feng Min,Zou Zhengguang,Xu Changji,Zhong Shenglin
La 0.8- x Eu x Sr 0.2 MnO 3 (LESMO) ( x = 0.05, 0.10, 0.15) samples were synthesized by the sol-gel (S-G) method. The effect of Eu 3+ doping at the A-site on the microstructure, morphological, and magnetocaloric effect (MCE) of LESMO was investigated. XRD revealed that the LESMO samples had a rhombohedral structure within the R-3c space group. The cell volume ( V ) decreased with increasing Eu 3+ doping. The magnetic properties of LESMO revealed a ferromagnetic-paramagnetic transition around the Curie temperature (T C ) with an increase in the Eu 3+ doping level. Using Banerjee’s criterion and utilizing normalization, it was confirmed that a second order magnetic phase transition (SOMPT) occurs in LESMO near T C . The maximum magnetic entropy change \((-\Delta {S}_{M}^{M{ax}})\) of LESMO ( x = 0.05, 0.10, and 0.15) was 5.22 J/(kg·K), 4.68 J/(kg·K), and 3.55 J/(kg·K), respectively, under an external magnetic field (H). The relative cooling power ( RCP ) of LESMO was 285.01 J·kg −1 ( x = 0.05), 289.60 J·kg −1 ( x = 0.10), and 300.15 J·kg −1 ( x = 0.15). La 0.65 Eu 0.15 Sr 0.2 MnO 3 exhibits a higher maximum RCP of 300.15 J·kg −1 , equal to 73.2% of that of Gd. Graphical
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Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 21
·7580-7587
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IF 5.7
Jian Zhang,Xin Li,Wei Zeng,Daiyuan Liu,Lan Lu,Heng Dai,Junheng Yuan,Jianxiong Shao,Zhichao Liu,Jie Yu,Xuhui Xu
X-ray time-lapse imaging technology holds great potentials in healthcare diagnostics, radiation exposure monitoring and optoelectronics. However, classical methods, including optically stimulated luminescence and thermally stimulated luminescence, involve the construction of traps and release of carriers, leading to a short lifetime, instability and so on. Herein, we design a radio-photoluminescence material based on a conceptual model to achieve X-ray time-lapse imaging through X-ray-induced valence regulation in Eu-doped SrF2 phosphor. The experimental results show that the X-ray dose distribution could be accurately obtained through photoluminescence discoloration. Moreover, the time-lapse imaging information written by X-ray could also be read out quickly upon ultraviolet irradiation using a delayed method, achieving a high time-lapse imaging resolution (16.6 lp mm−1) with a short irradiation time. This excellent performance is attributed to the optimized imaging plate prepared by applying the high-temperature melting method, which reduces the spacing between europium atoms, speeds up electron transfer, and improves the reduction rate from Eu3+ to Eu2+. Meanwhile, the imaging plate displays excellent stability and reusability for X-ray time-lapse imaging. Therefore, our findings provide new insights into high-quality time-lapse X-ray imaging and dosimetry through valence regulation.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 7.7
Na-Na Ran,Quan Luo,Hong-Wei Li,Yuqing Wu
Herein, a novel ratiometric fluorescent nanosensor was prepared by in-situ incorporation of Eu 3+ into nitrogen-rich carbon dots (Eu-CDs) via a one-step hydrothermal route. The obtained Eu-CDs display dual emission: a strong blue band at 440 nm (carbon core) and a weak red band at 615 nm ( 5 D 0 → 7 F 2 transition of Eu 3+ ). Upon titrating oxytetracycline (OTC) into the system, the blue signal remained invariant as an internal reference, whereas the red emission dramatically enhanced by the OTC-mediated antenna effect. The intensity ratio ( I 615 / I 440 ) increases linearly with OTC concentration over 1.0 – 50 µM, affording a limit of detection of 35 nM. Concomitantly, the dispersion exhibits a naked-eye color switch from blue to red under 365 nm UV illumination. Mechanistic investigations reveal that the specific recognition originates from (i) coordination between Eu 3+ and the β-diketone moiety of OTC and (ii) hydrogen-bonding interactions between OTC and the CDs surface. Although the probe is highly selective toward OTC over common ions and amino acids, it suffers from cross-reactivity among tetracycline antibiotics. This limitation was overcome by coupling the ratiometric read-out with linear discriminant analysis (LDA) of dual-mode (fluorescence and absorption) data, enabling 100% correct classification of OTC, tetracycline (TC), chlortetracycline (CTC), and doxycycline (DC) in both individual and mixed samples. The proposed strategy furnishes a simple, green and low-cost route to Eu-CDs and establishes a robust, portable platform for ultrasensitive quantification and discriminative sensing of tetracycline antibiotics in complex matrices.
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JOURNAL OF MOLECULAR STRUCTURE
·
2026
·
IF 4.9
Qiang Zhao,Zhi Shen,Lin-Xi Qin,Meng-Ting Fan,Pei-Xuan Zhang,Xin-Yue Zhang
Complex 1 and 2 exhibit excellent red and green fluorescence, respectively. • Complexes 1 and 2 exhibit excellent selectivity towards Fe 3+ . • Complex 1 and 2 have good recognition of I - and F - in anions, respectively. • Complex 2 can achieve naked eye recognition of F - . To further advance research on rare earth complexes as Luminescent probes, this work investigates the cation and anion recognition capabilities of europium and terbium carboxylate complexes, Eu(ocpia) ( 1 ) and Tb(ocpia) ( 2 ), in dispersed systems. Cation recognition experiments were performed using DMF as the dispersion medium, with the complex concentration fixed at 0.2 mg/mL. Results demonstrate that both complexes 1 and 2 exhibit excellent selectivity for Fe³⁺, with detection limits as low as 0.076 μM and 0.069 μM, respectively. These findings indicate that complexes 1 and 2 hold great potential as fluorescent probes for Fe³⁺ detection. Anion recognition experiments were conducted in acetonitrile dispersion (0.2 mg/mL complex concentration). Complex 1 shows high selectivity for I⁻, achieving a detection limit of 0.052 μM. In contrast, complex 2 displays strong affinity for F⁻, with a detection limit of 0.087 μM. Notably, F⁻ can coordinate with complex 2 to form a soluble adduct, enabling visual, naked-eye recognition of F⁻. Collectively, these results highlight the promising application of complexes 1 and 2 as selective fluorescent probes for I⁻ and F⁻, respectively. Eu and Tb complexes exhibit excellent red and green fluorescence, respectively, and both have excellent recognition for Fe 3+ . Tb complex can experimentally recognize F - with naked eyes Download: Download high-res image (228KB) Download: Download full-size image
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2026
·
IF 7.9
Linfeng Jiang,Jingjing Zhang,Xu Liu,Guoqing Zhang,Feng Hong
Europium complex was grafted onto SCFs and FEVE resin by multi-step modification. • Modified SCFs show improved dispersion and compatibility in the FEVE matrix. • The HK-SCF@Eu/FEVE coating provides long-term corrosion protection (1440 h). • Fluorescence attenuation enables real-time corrosion monitoring (R 2 = 0.982). Fluorocarbon resin (FEVE) coatings are widely used for metal corrosion protection due to excellent weatherability and chemical inertness. However, pristine FEVE coatings suffer from microporous defects, while short carbon fibers (SCF) as reinforcing fillers face poor interfacial compatibility and easy agglomeration in the resin matrix. Moreover, traditional coatings lack periodic corrosion monitoring capability. A multi-step surface modification strategy is proposed: SCF are synergistically modified with nitric acid (HNO₃) and a silane coupling agent (KH550) to obtain HK-SCF, improving surface activity and interfacial compatibility; then, a rare-earth europium complex Eu(phen)₂(NO₃)₃ is grafted onto HK-SCF to obtain fluorescence-functionalized HK-SCF@Eu, which is subsequently incorporated into FEVE to construct a fluorescence-sensing composite coating (HK-SCF@Eu/FEVE). Results indicate that synergistic HNO₃-KH550 treatment significantly increases surface roughness and functional group density of SCF, facilitating uniform grafting of the europium complex. At the optimal SCF content of 1.5 wt%, the composite coating exhibits the strongest fluorescence intensity, a tensile strength 38.8% higher than pure FEVE, an elongation at break of 67.7%, a corrosion current density of 3.59 × 10 −9 A·cm −2 , and a polarization resistance of 1.18 × 10 7 Ω·cm 2 . After 1440 h of salt spray and atmospheric corrosion testing, the coating demonstrates excellent long-term corrosion resistance. Furthermore, a linear relationship with R 2 = 0.982 is established between fluorescence intensity attenuation and corrosion time, enabling periodic visual monitoring of coating failure. This work successfully integrates fluorescence sensing into an FEVE-based coating, providing integrated corrosion protection and periodic monitoring for metal structures in marine engineering.
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Frontiers in Chemistry
·
2021
·
IF 5.221
Wang Yaping,Ma Biao,Liu Miaomiao,Chen Erjing,Xu Ying,Zhang Mingzhou
A fluorescent immunoassay based on europium nanoparticles (EuNPs-FIA) was developed for the simultaneous detection of antibiotic residues, solving the problems of single target detection and low sensitivity of traditional immunoassay methods. In the EuNPs-FIA, EuNPs were used as indictive probes by binding to anti-tetracyclines monoclonal antibodies (anti-TCs mAb), anti-sulphonamides monoclonal antibodies (anti-SAs mAb) and anti-fluoroquinolones monoclonal antibodies (anti-FQs mAb), respectively. Different artificial antigens were assigned to different regions of the nitrocellulose membrane as capture reagents. The EuNPs-FIA allowed for the simultaneous detection of three classes of antibiotics (tetracyclines, fluoroquinolones and sulphonamides) within 15 min. It enabled both the qualitative determination with the naked eye under UV light and the quantitative detection of target antibiotics by scanning the fluorescence intensity of the detection probes on the corresponding detection lines. For qualitative analysis, the cut-off values for tetracyclines (TCs), fluoroquinolones (FQs) and sulphonamides (SAs) were 3.2 ng/ml, 2.4 ng/ml and 4.0 ng/ml, respectively, which were much lower than the maximum residue limit in food. For quantitative analysis, these ranged from 0.06 to 6.85 ng/ml for TCs, 0.03–5.14 ng/ml for FQs, and 0.04–4.40 ng/ml for SAs. The linear correlation coefficients were higher than 0.97. The mean spiked recoveries ranged from 92.1 to 106.2% with relative standard deviations less than 8.75%. Among them, the three monoclonal antibodies could recognize four types of TCs, seven types of FQs and 13 types of SAs, respectively, and the detection range could cover 24 antibiotic residues with different structural formulations. The results of the detection of antibiotic residues in real samples using this method were highly correlated with those of high performance liquid chromatography (R2 > 0.98). The accuracy and precision of the EuNPs-FIA also met the requirements for quantitative analysis. These results suggested that this multiplex immunoassay method was a promising method for rapid screening of three families of antibiotic residues.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Xiao-Yang Zhao,Jia Wang,Hai-Gang Hao,Hui Yang,Qi-Shan Yang,Wen-Yuan Zhao
Sensitive, efficient and rapid detection of 2, 6-pyridinedicarboxylic acid (DPA), commonly labeled as the main biology marker for bacillus anthracis, is of far-reaching consequence to eliminate potential threats. In this work, a 3D Eu-MOF ([Eu(DHBDC) 1.5 (DMF) 2 ]·DMF) that has outstanding thermal and water stability was synthesized. The Eu-MOF showed characteristic fluorescence at 506 nm caused by ligand π-π* transition. The quantum calculation showed that there was a large energy difference between the 5 D 0 level of Eu 3+ and the triplet energy level of 2,5-dihydroxy terephthalic acid ligand (DHBDC 2- ), which was why the coordination compound did not exhibit the characteristic fluorescence of Eu 3+ . Interestingly, it effectively restored the red fluorescence of Eu 3+ (593, 618 and 699 nm) and showed a dual-emission fluorescence response at 506 and 593 nm when the DPA existed. Therefore, based on the high detection sensitivity of Eu-MOF (the detection limit is 1.3 μM) and outstanding anti-interference ability, it is expected to become a prospective ratiometric fluorescence sensor for the detection of DPA. In addition, combined with density functional theory (DFT) and a variety of other analytical methods, the detection mechanism of DPA by Eu-MOF was investigated in detail.
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RSC Advances
·
2018
·Vol. 8
·期 31
·17471-17476
·
IF 2.936
Yunhui Yang,Xiaofei Liu,Dan Yan,Ping Deng,Zhiyong Guo,Hongbing Zhan
We describe a highly sensitive chemical sensor for the detection of the hydrazine hydrate. The chemical sensor was synthesized by simply doping a UiO-66 type metal–organic framework (MOF) with Eu3+ through a well-known post-synthetic modification method. The Eu3+@MOF was characterized by powder X-ray diffraction (PXRD), nitrogen gas adsorption isotherm measurements, FTIR, and ICP-MS. This luminescent probe exhibits strong emission intensity, and more significantly, displays various merits, such as high selectivity with notable photoluminescence quenching effect, rapid response time, and remarkable sensitivity with low detection of limit for hydrazine recognition. Under the optimal experimental conditions, hydrazine hydrate can be detected by this method in concentrations as low as 0.18 μM, which is much lower than the threshold limit value (10 ppb, ≈0.3 μM) of hydrazine exposure recommended by the U.S. Environmental Protection Agency (EPA). More interestingly, a portable film sensing device derived from this MOF display quick response to hydrazine hydrate within 90 s. A possible luminescent quenching mechanism for hydrazine hydrate was also investigated.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 21
·8363-8369
·
IF 3.069
Xiaoying Zhang,Xiaoli Kang,Wen Cui,Qing Zhang,Zhou Zheng,Xudong Cui
Two europium(III)-based metal–organic frameworks (MOFs) (Eu-BDC and Eu-BTC) have been synthesized by a solvothermal method with high sensitivity. It was found that the sensitivity of both Eu-BDC (0.065 vol%), which consists of flower-like microcrystals constructed by abundant nanoparticles, and Eu-BTC (0.06 vol%), which comprises nanolayer bunches, is below the occupational exposure limit of acetone (0.075 vol%) stipulated by the American Conference of Governmental Industrial Hygienists. In addition, Eu-BDC and Eu-BTC have good chemical stability and are promising for detection of acetone content in the environment. The fluorescence-quenching mechanism for Eu-BDC and Eu-BTC may be the fluorescence inner filter effect. Furthermore, the morphology of Eu-MOFs, that is, the specific surface area and pore size distribution, may be one of the factors affecting the fluorescence intensity and sensitivity of Eu-MOFs to acetone.
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