Materials Today Physics
·
2024
·
IF 10
Zhaojun Mo,Quanyi Liu,Wexiang Hao,Lingwei Li,Huicai Xie,Qi Fu,Xinqiang Gao,Jun Shen
We herein investigated the divalent europium borate Eu 2 B 2 O 5 compound regarding its structural, magnetic and magnetocaloric properties by means of experimental determinations and first principal calculations. The Eu 2 B 2 O 5 compound was found to crystallize in a monoclinic structure ( P 2 1 /c space group) and order ferromagnetically at ground state . A large cryogenic reversible MCE was observed in the Eu 2 B 2 O 5 compound around 2.7 K. The maximum values of magnetic entropy change of Eu 2 B 2 O 5 compound reach 13.7, 28.2 and 46.9 J/kgK under the magnetic field changes of 0–1, 0–2, and 0–5 T, respectively. The corresponding values of adiabatic temperature change and refrigerant capacity are obtained to be 3.3, 7.0, and 13.3 K and to be 37.8, 102.5, and 317.3 J/kg. These magnetocaloric parameters, especially under relatively low-field changes, are better than those of the reported candidate materials, which makes the Eu 2 B 2 O 5 compound attractive for cryogenic MR applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Xiaobin Zhao,Quansheng Wu,Xufeng Zhou,Shanshan Ye,Jianyan Ding
The realization of Eu 3+ reduction and its reduction mechanism have become focal points in the field of WLED phosphor research. In this study, the reduction of Eu 3+ was successfully achieved through cationic substitution strategy by replacing Zr 4+ with Hf 4+ in Na 2 ZrSiO 5 :Eu 3+ . The effects of substituting Hf 4+ for Zr 4+ on the phase, crystal structure, and luminescence properties of Na 2 Zr 1- x Hf x SiO 5 :Eu 0.03 (0 ≤ x ≤ 1) were thoroughly investigated based on Rietveld refinement , spectral data, DFT calculation and electronegativity of ions. Comprehensive consideration was given to the effect of site size change and site reducibility on Eu 3+ reduction. The results demonstrate that the reduction of Eu 3+ in Na 2 Zr 1- x Hf x SiO 5 :Eu 0.03 is attributed to the alteration in inducible effect caused by cationic substitution and the enhancement in site reducibility rather than changes in site size. Therefore, the cationic substitution strategy based on induction effect presents a novel approach for achieving Eu 3+ reduction and offers a new insight into developing and modifying Eu 2+ -activated phosphors.
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Methods and Applications in Fluorescence
·
2017
·Vol. 5
·期 1
·015003
·
IF 2.656
Meng Li Liu,Bin Bin Chen,Tong Yang,Jian Wang,Xi Dong Liu,Cheng Zhi Huang
The detection of tetracycline is of great significance because of its damaging effects on human health, such as renal toxicity and hemolytic anemia. Any release of tetracycline into the surrounding environment can produce bacterial drug resistance. We develop a new sensitive and selective detection approach for tetracycline in complex water samples by preparing europium-doped carbon quantum dots (Eu-CQDs) through a simple and rapid carbonization method operating at 200 °C for 5 min. The Eu-CQDs are characterized by blue photoluminescence, excitation-wavelength-dependent emission and excellent stability. Importantly, the fluorescence of the Eu-CQDs can be quenched efficiently by tetracycline, based on the strong inner filter effect mechanism between Eu-CQDs and tetracycline, making the fluorescence intensity ratio (I0/I) of the Eu-CQDs at 465 nm correlate linearly with the concentration of tetracycline in the range of 0.5–200 μM, with a limit of detection of 0.3 μM. This shows the broad applicability of the Eu-CQDs in pursuing the concepts of simplicity and specificity for analytical purposes.
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CRYSTENGCOMM
·
2025
·
IF 2.6
Yue Yuan,Liangliang Huang,Yang Lu,Xin Shao,Yanfeng Bi
In this study, a europium(III) sulfite-oxalate complex (compound 1) with a three-dimensional structural arrangement was synthesized by hydrothermal method. Notably, compound 1 exhibited excellent pH and luminescence stability and demonstrated the capability of detecting Fe3+ in water by using fluorescence bursts. The proton conductivity of compound 1 reached 9.48 × 10-5 S·cm-1 at 98% RH (relative humidity) and 75 °C. By studying the crystal structure, fluorescence, and proton conductivity properties of dual-function inorganic-organic hybrid materials, this study provides an important reference for the future development of dual-function inorganic-organic hybrid materials.
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MICROCHIMICA ACTA
·
2026
·Vol. 193
·期 11
·770
·
IF 5.4
Yi Jintao,Li Anqi,Han Xianqin,Fu Nani,Chen Ziluo,Yang Tingting,Zhou Zihan,Wang Min,Chen Yashan,Xue Jun,Ma Xiaoming,Qian Yiping
A signal probe, Eu-2MIM@CDs, was prepared by embedding carbon dots (CDs) into a porous europium-based metal–organic framework (Eu-2MIM) composed of europium and 2-methylimidazole, and was deployed for the dual-signal detection of flumequine (FLU) antibiotic. This single probe provided two distinct signal outputs for FLU ratiometric sensing: colorimetric and fluorescence signals. In the colorimetric channel, the Eu-2MIM@CDs complex reacted with Eriochrome Black T (EBT) to form a magenta Eu 3 ⁺–EBT complex. Upon the introduction of FLU, FLU competitively displaced EBT from the complex, releasing free EBT and restoring the blue color. This displacement process was accompanied by ratiometric absorbance changes at 538 nm and 610 nm, enabling multi-color visual detection. In the fluorescence channel, the Eu-2MIM@CDs probe initially exhibited emission from CDs at 436 nm. Upon adding FLU, the characteristic Eu 3 ⁺ fluorescence was significantly enhanced through a coordination-environment change, which simultaneously quenched the emission at 436 nm and generated a new emission peak at 612 nm, yielding a concentration-dependent ratiometric fluorescence response for FLU detection. In the colorimetric channel, as the FLU concentration increased, the absorbance at 538 nm progressively decreased while that at 610 nm increased, producing a well-defined ratiometric colorimetric signal. This channel provided a wide linear detection range from 0.01 to 2.5 µM with a detection limit of 3.3 nM. The visible color of the solution shifted from magenta to blue with rising FLU concentration. In the fluorescence channel, the intensity at 436 nm gradually decreased along with an increase at 612 nm, showing a linear range from 0.005 to 2.0 µM and a detection limit of 1.7 nM. The fluorescence response was rapid, completing within 1 min. As the FLU concentration increased, a visible color shifted from blue to red. The fluorescence channel exhibited high selectivity toward FLU over other antibiotics, organic compounds and metal ions, while the colorimetric channel showed fluoroquinolone-class selectivity. Furthermore, the probe showed good practicability in actual samples. Collectively, this dual-signal probe provides a simple, fast and efficient method for both visual and quantitative FLU detection in complex matrices. Graphical abstract
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2026
·
IF 4.1
Yi Jintao,Fu Nani,Zhong Wenhui,Liu Xia,Zhou Anqi,Li Xun
Amoxicillin (AMO), a penicillin antibiotic, and ciprofloxacin (CIP), a quinolone antibiotic, are widely used to combat bacterial infections and are frequently co-administered to enhance therapeutic efficacy. However, improper use of AMO and CIP may lead to antibiotic residues in the environment, posing serious threats to human health. The visual detection of AMO and CIP remains significant challenges. Herein, the Eu-DPA@CQDs was used for the dual-mode detection of AMO and CIP, which was synthesized by CQDs doped in europium-DPA metal-organic framework. In the colorimetric mode, the catalase-mimicking Eu-DPA@CQDs oxidized TMB to blue oxTMB. Upon addition of AMO, the oxTMB was reduced, causing color fading. Subsequent introduction of CIP restored nanozyme activity, regenerating the blue signal and enabling dual-analyte antibiotic detection. In the fluorescence mode, the Eu-DPA@CQDs probe exhibited dual emission at 440 nm and 613 nm. Upon AMO addition, the fluorescence at both wavelengths was quenched, accompanied by a color change from red to purple. In the presence of CIP, the emission at 440 nm increased and redshifted to 490 nm, while the signal at 613 nm was quenched, resulting in a multicolor transition from red to cyan. The Eu-DPA@CQDs sensor enabled rapid and dual-mode detection of AMO and CIP. The colorimetric method exhibited wide linear ranges of 0.005–25 μM for AMO and 0.007–4.25 μM for CIP, with detection limits of 1.67 nM and 3.75 nM, respectively. A visible color transition from dark blue to colorless was observed with increasing AMO concentration, while the addition of CIP reversed the signal back to dark blue. Similarly, the fluorescence detection achieved wide linear ranges from 0.005 to 30 μM for AMO and 0.005 to 15 μM for CIP, with detection limits as low as 4.74 nM and 3.11 nM, respectively, also within only 1 min. As the concentration of AMO increased, the color shifted from red to purple. In contrast, increasing CIP concentration induced a color transition from red to cyan. These color transitions were both clearly visible to the naked eye. The sensor demonstrated excellent selectivity and anti-interference capability, providing a reliable platform for accurate, sensitive, and quantitative determination of both antibiotics in real samples. Graphical abstract
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NUCLEAR TECHNOLOGY
·
2026
·
IF 2
Chen Chuanhong,Tao Qinqin,Cao Bin,Jesse Daniel,Dai Ying
Herein the study of homogeneous-phase solvent extraction with an ionic liquid ([Hbet][Tf2N]) toward europium (III) from a nitrate system is reported. [Hbet][Tf2N], which forms a homogeneous phase with water above the upper critical solution temperature (UCST), was synthesized via a displacement reaction between (carboxymethyl)trimethylammonium chloride and Li[Tf2N]. The dependence of the distribution ratio (D) on key variables, including initial pH, nitrate concentration, contact time, initial Eu3+ concentration, and temperature, was systematically investigated. The upper critical transition temperature was determined as 333 K, beyond which the homogeneous-phase solvent extraction started. The saturated extraction capacity reached 552.92 mg Eu3+ per liter of [Hbet][Tf2N]. The extraction mechanism was revealed using a slope method. The stripping study was conducted by using HCl of 1.0 mol/L as stripping agent. Thermodynamic parameters (∆H°,∆S°, and ∆G°) were determined from temperature-dependent data. Multi-stage countercurrent extraction was carried out to simulate the industrial process. Above the UCST, the homogeneous ionic-liquid/aqueous system provides enhanced interfacial contact, which promotes the extraction of Eu3+.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2026
·
IF 4.6
Biao Guan,Ruxue Wang,Wenting Wang,Jian Zhang,Huixiang Yan,Jia Jin,Jianguo Xu,Lei Li,Longhua Guo,Yanbo Zeng
MC-LR inhibits the activity of protein phosphatase, causing liver tumors. It is vital to detect MC-LR in water samples. Herein, this work developed the colorimetric and photothermal dual-mode aptasensor of microcystin-LR (MC-LR) detection with europium hexacyanoferrate (Eu-HCF) nanozyme. The peroxidase-like (POD-like) activity of Eu-HCF was higher than that of Ca-HCF, Mn-HCF and Cu-HCF nanozymes. The POD-like activity of Eu-HCF in the presence of MC-LR aptamer decreased, indicating that the MC-LR aptamer (Apt) was adhered to the surface of the Eu-HCF nanozyme. When the MC-LR Apt specifically recognized MC-LR, which further increased this inhibition. Therefore, detection of MC-LR was achieved using this colorimetric and photothermal dual-mode aptasensor with Eu-HCF nanozyme. The colorimetric aptasensor exhibited analytical performance for MC-LR detection in the range of 1-1500 ng L -1 and a detection limit of 0.33 ng L -1 . This photothermal aptasensor showed linearity with MC-LR concentration at 1-1500 ng L -1 , achieving a detection limit of 0.27 ng L -1 . The proposed sensor had good selectivity for MC-LR detection in the presence of other microcystins and some metal ions. The proposed colorimetric and photothermal dual-mode aptasensor was successfully utilized for determination of MC-LR in tap and lake water samples with recovery rates ranged from 97.2% to 110.4%.
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JOURNAL OF FLUORESCENCE
·
2026
·
IF 3.1
Zheng Xinxiang,Xu Hui,Zhang Runke,Zhao Tengzhi,Wang Zhaofeng,Zhao Xingfei,Wang Hua
In this study, a dual-ratiometric optical probe utilizing europium-doped carbon dots (Eu-CDs) was developed for simultaneous fluorescent and colorimetric detection of tetracycline (TC). The Eu-CDs complex was synthesized through a hydrothermal approach. Upon coordination with Eriochrome Black T (EBT), the Eu-CDs complex exhibits a distinct magenta coloration. Introduction of TC triggers a ligand displacement reaction, resulting in color transition from magenta to blue, resulting in ratiometric colorimetric visual detection. Meanwhile, the TC-bound EBT-CDs@Eu complex emits ratiometric fluorescence change. A ratiometric fluorescence detection method was established for TC based on the absorbance-energy transfer-emission (AETE) mechanism, culminating in the successful design of a dual-ratiometric optical probe. The colorimetric assay demonstrated a detection limit (LOD) of 20.5 nM for TC. Furthermore, the practical applicability of this sensor was validated through successful TC detection in aquaculture samples, highlighting its potential for real-world monitoring applications.
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ACS Nano
·
2025
·
IF 16
Yifan Wang,Jinjin Wang,Siwei Zhang,Natalie Y. Baona Tang,Xinwen Ou,Jinhui Jiang,Fulong Ma,Parvej Alam,Zijie Qiu,Wen-Jin Wang,Zheng Zhao,Jacky W. Y. Lam,Ben Zhong Tang
Europium(III) (Eu3+) ions are renowned for their exceptional photophysical properties, making them invaluable in applications such as energy-efficient lighting, display technologies, and advanced laser systems. However, transitioning Eu3+ from solid-state matrices to solution-based environments typically results in a significant decline in luminescence efficiency due to strong vibrational coupling and dynamic coordination interactions with solvents. These issues have hindered the broader application of rare earth ions in solution-based technologies such as biological imaging probes and optical sensors. Herein, we report an innovative electronic–vibrational decoupling (EVD) strategy aimed at minimizing nonradiative decay pathways in rare earth ions. Through systematic modulation of the solvent environment─including replacing water with N,N-dimethylformamide (DMF), tuning temperature, and employing deuterated solvents─we demonstrate that the photoluminescence quantum yield (ΦPLQY) of Eu3+ solutions can be enhanced dramatically from around 2% in H2O to over 80% in deuterated DMF. The suppression of nonradiative decay pathways is corroborated by significant increases in emission intensity, prolonged luminescence lifetimes, and marked shifts in the I616/I591 intensity ratio, an established indicator of coordination symmetry. Furthermore, our study reveals that the unconventional aggregation-induced emission (AIE) phenomenon in Eu3+ solvents is governed by EVD rather than by restrictions of the intramolecular motion (RIM) mechanism found in organic systems. This work highlights the interplay between solvent vibrations and rare earth photophysics, establishing a robust framework for developing high-performance, solution-based rare earth luminescent materials.
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ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Ying Wang,Yujing Han,Wei Wang,Yali Qiao
Effective control of carbon dot (CD) self-assembly into larger nanoclusters in the liquid state for ultrasensitive detection is challenging and still in its infancy. For the first time, a europium(III) coordination-mediated strategy for self-assembly of N-doped carbon dots into large nanoclusters (N, Eu3+-CD nanoclusters) in aqueous solution was developed. It was found that the sizes and photoluminescence (PL) properties of nanoclusters could be effectively tuned by adjusting the Eu3+ content. The larger clusters with relatively longer fluorescence lifetimes were obtained by increasing the Eu3+ content. The simultaneous coordination of multi-CD particles with a Eu3+ and a dot particle with multiple Eu3+ was the key to inducing the self-assembly of CDs and regulating their optical properties. Furthermore, a dual-emitting N, Eu3+-CD nanocluster-based probe was constructed for the fluorescence ratiometric detection of tetracycline (TC). Once introducing TC, the blue emission of CDs was quenched through an IFE effect, but red emission of Eu3+ was significantly sensitized through an AE effect. Taking advantage of aggregation of CDs in aqueous solution, the N, Eu3+-CD nanocluster possessed a high sensitivity for detection of TC due to the spatial proximity of a large number of sensing units in the aggregated nanocluster assembly. The detection limit for TC was low to 35 nM. This work will provide a new insight into tuning the self-assembly of CDs and to regulate the photoluminescence and sensing performance of CDs.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Yulin Wang,Libo Nie,Yongbiao Hua,Liang Gong,Xiuzhen Qiu,Huishi Guo
In this work, a ratiometric fluorometric sensor based on nickel nanoclusters (NiNCs)-europium complex (NiNCs-Eu 3+ ) was constructed for the highly selectivity detection of tetracyclines (TCs) in water samples. In the presence of TCs, the blue fluorescence of the sensor NiNCs-Eu 3+ was quenched at 430 nm and the characteristic red fluorescence of Eu 3+ -TCs appeared at 620 nm because of the combined help of inner filter effect (IFE) and antenna effect. Under the optimized conditions (100 mM Eu 3+ (100 µL); temperature (25℃); reaction time (10 min), HEPES buffer solution (pH = 7.0)), the sensor offered a wide detection range of tetracycline (TC) and oxytetracycline (OTC) from 0.1 to 50 μM with the detection limit (LOD) of 25 nM and 21 nM, respectively. Moreover, the sensor was able to detect of TC and OTC in tap and lake water with high recovery rate (89.10%-97.60%). In addition, the portable paper-based sensor was constructed using filter paper embedded with NiNCs-Eu 3+ . The distinct fluorescent color of the paper-based sensor varied from bright blue to red against different concentrations of TC and OTC. These above findings demonstrated the potential for wide application of as-prepared ratio metric fluorescence sensor for visual detection of TCs in water samples.
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