FOOD CHEMISTRY
·
2025
·
IF 9.8
Shuang Liu,Chenxi Zhao,Huiya Yuan,Lina Gao,Yan Zhang
Rapid and accurate field testing for oxytetracycline (OTC) is crucial for ensuring food safety and monitoring environmental pollution. Herein, we report the construction of an aggregation-induced emission metal-organic frameworks (MOFs)-mediated molecularly imprinted ratio metric fluorescent sensor (AIE/Eu@MIPs) for the rapid and selective detection of OTC with high sensitivity. AIE MOFs with ultra-high quantum yield were utilized as the blue fluorescence emission carriers, thus avoiding any compromise between convenience and cost-effectiveness. The detection sensitivity was significantly enhanced by modifying the fluorescence signals, driven by the combined effects of the inner filter effect (IFE) and antenna effect (AE). The detection limit was as low as 21 nM (about 9.67 μg/kg). More importantly, a portable optical sensing platform integrating AIE/Eu@MIPs was developed for visual detection of OTC. The developed probe and portable device-based sensing platform demonstrate considerable potential for on-site detection of OTC in real-world applications.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2017
·Vol. 83
·期 2
·447-456
·
IF 1.575
Mou Yongren,Kang Ming,Wang Feng,Liu Min,Chen Kexu,Sun Rong
Abstract Monodisperse core-shell structured SiO 2 @SiO 2 :Eu(DBM) 3 phen microspheres, as a new kind of fluorescent particles, were fabricated by a seeded growth method in the presence of surfactant CTAB (DBM = dibenzoylmethane, phen = 1,10-phenanthroline, CTAB = cetyltrimethyl ammonium bromide). In this way, a thin mesoporous silica shell doped with Eu(DBM) 3 phen was grown on the prepared monodisperse silica colloids. The structures of the as-prepared phosphors were characterized by means of X-ray diffraction, Fourier transform infrared spectrum, thermal gravimetric analysis–differential scanning calorimetry, field emission scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectrometry, nitrogen adsorption-desorption techniques, and photoluminescence spectra. The experimental results show that the microshpere has a typical core-shell structure with a diameter of about 370 nm, consisting of the silica colloids core with about 340 nm in diameter and mesoporous silica shell doped with europium complexes with an average thickness of about 15 nm. The as-obtained core-shell microspheres exhibit a strong red emission peak originating from electric-dipole transition 5 D 0 → 7 F 2 (610 nm) of Eu 3+ ions under the excitation of 405 nm. Additionally, the photoluminescence intensity increases with the increasing of europium complexes concentration in mesoporous silica shell, and concentration quenching occurs when europium complexes concentration exceeds 7.0 mol%. The prepared microspheres may present potential applications in the fields of optoelectronic devices, bio-imaging, medical diagnosis, and the packing structural functional composites. Graphical Abstract Monodisperse core-shell structured SiO 2 @SiO 2 : Eu(DBM) 3 phen microspheres with high lumious performance were fabricated by a seeded growth method by means of surfactant CTAB.
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MATERIALS CHEMISTRY AND PHYSICS
·
2025
·
IF 4.7
Yuanqing Wang,Yusong Pan,Shuhuan He,Run Huang
This study reports an innovative europium-iron co-doped bismuth tungstate catalyst (EF-Bi 2 WO 6 ) for rapid organic pollutant degradation through a visible light-driven photo-Fenton process. The results of degradation experiment verified that the 1-EF-BWO catalyst exhibited superior photo-Fenton catalytic activity relative to single-doped and undoped Bi 2 WO 6 , achieving over 99 % degradation of Rhodamine B (RhB) within 6 min, with a kinetic rate constant of 0.9745 min −1 , which was 4.81 times higher than pure Bi 2 WO 6 (0.1678 min −1 ) and 2.42–2.92 times superior to Eu- or Fe-doped Bi 2 WO 6 . Remarkably, 1-EF-BWO maintained consistent degradation efficiency across a broad pH value and diverse ionic environments, showcasing robust operational adaptability. The enhanced catalytic activity is attributed to synergistic electron transfer mechanisms between Eu 3+ , Fe 3+ , and the Bi 2 WO 6 matrix, which optimized band gap structure to facilitate charge carrier separation. EPR spectroscopy revealed that singlet oxygen ( 1 O 2 ), photogenerated holes (h + ), and superoxide radicals (·O 2 − ) served as the primary reactive species driving pollutant mineralization. Reusability tests demonstrated remarkable catalytic stability over multiple cycles. Phytotoxicity assessments revealed that EF-Bi 2 WO 6 -treated wastewater significantly enhanced mung bean germination rates, underscoring its ecological compatibility for sustainable wastewater remediation. These results establish EF-Bi 2 WO 6 as a sustainable, pH-tolerant nanocatalyst with dual advantages of ultrafast degradation kinetics and environmental safety.
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MOLECULES
·
2025
·Vol. 30
·期 15
·3280
·
IF 4.6
Hongyuan Zhang,Qian Zhang,Juan Tang,Huanxin Yang,Xiaona Ji,Jieqiong Wang,Ce Han
Degradable fluorescent sensors present a promising portable approach for heavy metal ion detection, aiming to prevent secondary environmental pollution. Additionally, the excessive intake of ferric ions (Fe3+), an essential trace element for human health, poses critical health risks that urgently require effective monitoring. In this study, we developed a thermally degradable fluorescent hydrogel sensor (Eu-CDs@DPPG) based on europium-doped carbon dots (Eu-CDs). The Eu-CDs, synthesized via a hydrothermal method, exhibited selective fluorescence quenching by Fe3+through the inner filter effect (IFE). Embedding Eu-CDs into the hydrogel significantly enhanced their stability and dispersibility in aqueous environments, effectively resolving issues related to aggregation and matrix interference in traditional sensing methods. The developed sensor demonstrated a broad linear detection range (0–2.5 µM), an extremely low detection limit (1.25 nM), and rapid response (<40 s). Furthermore, a smartphone-assisted LAB color analysis allowed portable, visual quantification of Fe3+with a practical LOD of 6.588 nM. Importantly, the hydrogel was thermally degradable at 80 °C, thus minimizing environmental impact. The sensor’s practical applicability was validated by accurately detecting Fe3+in spinach and human urine samples, achieving recoveries of 98.7–108.0% with low relative standard deviations. This work provides an efficient, portable, and sustainable sensing platform that overcomes the limitations inherent in conventional analytical methods.
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JOURNAL OF FLUORESCENCE
·
2025
·
IF 3.1
Yao Jie,Chen Hongfang,Yang Xiaohua,Iqbal Muzaffar,Bian Wei
Mercury ions (Hg 2+ ) are categorized as environmental pollutants, which distributed in water, soil, and food systems due to environmental contamination. Hence, designing a sensitive assay for the convenient determination of Hg 2+ is of great importance. Herein, S and O-doped graphite phase nitrogenized carbon quantum dots (S, O-C 3 N 4 QDs) was encapsulated within a europium -based metal-organic framework (Eu-MOF) to construct a novel ratiometric fluorescent nanoprobe for the quantitative detection of Hg 2+ . The native emission of S, O-C 3 N 4 QDs at 445 nm is used as a response signal, while Eu-MOF with fluorescence offers a reference signal at 619 nm. Hg 2+ exhibits high affinity for the surface functional groups of S/O-C 3 N 4 QDs, forming non-fluorescent chelation complexes that induce static quenching. This results in significant attenuation of the fluorescence intensity at 445 nm, while the emission at 619 nm remains invariant. A ratiometric fluorescence sensing platform was established based on the intensity ratio (F 445 /F 619 ) for the selective detection of Hg 2+ . The linear range of S, O-C 3 N 4 QDs/Eu-MOF of Hg 2+ was 0.25–35 µM and with a detection limit of 4.3 nM. The satisfying results demonstrate the effectiveness of the developed S, O-C 3 N 4 QDs/Eu-MOF-based fluorescence probe for Hg 2+ detection, highlighting its promising potential for environmental monitoring applications.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Wen-Jie Wu,Qi Zhao,Rui Zhou,Ya-Chuan Liang,Wen-Bo Zhao,Chong-Xin Shan
An europium functionalized ZnO quantum dots (QDs) ratiometric fluorescent nanoprobe is designed to establish a real time, on-site visual, and highly sensitive probe method for tetracycline (TC). The yellow-emitting ZnO QDs serves as the internal reference, while the Eu 3+ chelated on the surface of ZnO QDs is used as the signal reporting unit. This nanoprobe exhibits rapid response, excellent selectivity, and high sensitivity with a detection limit of 4 nM in detecting the levels of TC. In addition, fluorescence of the nanoprobe can change from yellow to red as the concentration of TC increases. Thus, naked eye detection of TC was realized using the test paper processed by nanoprobe, followed by RGB value analysis function on the mobile phone APP.
研究领域:
分析化学
·
纳米技术
·
环境科学
·
生物技术
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 7
·1-11
·
IF 6.232
Mao Xiaoxia,Liu Shaowei,Su Benyue,Wang Dejin,Huang Zhan,Li Jian,Zhang Yuanguang
A luminescent metal-organic framework of type Eu(III)-MOF has been fabricated for visual and on-site fluorometric determination of hydrogen peroxide (H 2 O 2 ) via a tablet computer. The maximum excitation and emission peaks of type Eu(III)-MOF were found at λex = 290 nm and λem = 615 nm, respectively. The average length of Eu-MOF is 1.21 ± 0.07 μm. In the presence of the target H 2 O 2 , Fe 2+ is transmitted into Fe 3+ via Fenton reaction, leading to a fluorescence quenching of Eu-MOF. Therefore, visible color change occurred from bright red into colorless. Interestingly, by means of tablet computer’s digital camera and ImageJ software, fluorescent signals were captured and transduced into digital parameters, resulting in a linear relationship between fluorescence intensity and the concentration of H 2 O 2 . As a result, the determination of H 2 O 2 without the aid of complicated instruments is achieved in the range 2.0 μM to 0.2 mM with a detection limit of 1.02 μM. Our approach has been successfully applied to quantify H 2 O 2 in serum, urine, and waste water with good recovery and precision (< 2.5% RSD). Besides, our assay has been exploited for visual detection of H 2 O 2 released from HepG2 cells with the advantages of portability and accuracy. Moreover, the strategy displays acceptable selectivity and stability. Hence, our assay provides an alternative practical method for on-site determination of H 2 O 2 without the need for instruments.
Schematic representation of the synthesis procedure of a luminescent Eu-MOF, which has been successfully applied for on-site detection of H 2 O 2 via Fenton reaction and imaging analysis technique. The method exhibits handheld and accuracy for H 2 O 2 determination, holding the potential for biochemical and clinical applications in remote regions.
研究领域:
分析化学
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生物化学
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材料科学
·
临床诊断
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高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 41
·14548-14558
·
IF 7.059
Zhihao Wang,Qinghong Meng,Chunyun Wang,Dianyuan Fan,Yu Wang
Phosphor-converted white light-emitting diodes (pc-WLEDs) integrated with deep UV chips and single-component white light-emitting phosphors have attracted widespread research interest recently. (Y,Tb,Eu)NbO4 nanophosphors with full-color emission properties were achieved in this work by a facile calcination-assisted hydrothermal method, and the elaborately designed white light-emitting (Y0.988Tb0.010Eu0.002)NbO4 phosphor was successfully applied to a 275 nm chip excited pc-WLED with a relatively low correlated color temperature (CCT) of 5517 K and a high color-rendering index (CRI) of 86.7. Through a comprehensive characterization by XRD, elemental analysis, FE-SEM, TEM, TG, FT-IR, UV-vis, and optical spectroscopy, the YNbO4 nanophosphor with optimal PL properties was evidenced to be obtainable through calcining the hydrothermally crystallized precursor at 1000 °C. The quenching concentrations of Tb3+ and Eu3+ in YNbO4 were determined to be ∼4 and 5 at%, respectively, and the efficiency of the NbO43− → Tb3+ energy transfer was calculated to be ∼47.93%. Upon excitation at 260 nm, the ternary (Y,Tb,Eu)NbO4 phosphor simultaneously displays blue NbO43−, green Tb3+, and red Eu3+ emissions. Benefiting from the NbO43− → Tb3+ → Eu3+ energy transfer, full color emission was achieved via adjusting the Tb3+ and Eu3+ concentrations in (Y,Tb,Eu)NbO4. The white light-emitting (Y0.988Tb0.010Eu0.002)NbO4 phosphor with color coordinates of (0.336, 0.334) can maintain its emission color and ∼67% of its overall emission intensity at 150 °C, indicating that the phosphor is highly promising for application in deep UV chip-based pc-WLEDs.
研究领域:
材料科学
·
光学工程
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2026
·
IF 14.3
Binbin Ning,Junyao Wu,Sai Liu,Jinwei Guo,Xiaopeng Hu,Qing Liu,Wang Zhu
A series of five (5RE 0.2 )Ta 3 O 9 high-entropy ceramics (RE = La, Gd, Nd, Dy, Sm, Eu, Ce) is successfully synthesized via a solid-state method. Their temperature-dependent fracture toughness is systematically investigated across the 25–1200 °C range, using in situ three-point bending tests coupled with the digital image correlation method. The fracture toughness exhibits a non-monotonic variation: it peaks at 2.3 MPa m 1/2 at room temperature, then sharply declines to a minimum of 1.5 MPa m 1/2 at 400 °C. Subsequently, an anomalous rebound to approximately 2.1 MPa m 1/2 is observed at 800 °C, followed by a further decrease, stabilizing between 1.7 and 1.9 MPa m 1/2 at 1200 °C. High-temperature X-ray diffraction and high-resolution transmission electron microscope results confirm an irreversible orthorhombic-to-tetragonal phase transformation occurring between 600 and 800 °C. Aberration-corrected STEM provides direct atomic-scale evidence of a high-density dislocation network interacting with crack tips, revealing dislocation pinning, bridging, and crack deflection. The combined action of phase-transformation-induced lattice strain and dislocation-mediated toughening effectively suppresses linear crack advance and enhances energy dissipation, thereby accounting for the partial recovery of fracture toughness at 800 °C. These direct observations establish a distinctive synergistic toughening mechanism in high-entropy ceramics, in which irreversible phase transformation and thermally activated dislocation networks cooperate to improve high-temperature fracture resistance.
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JOURNAL OF LUMINESCENCE
·
2026
·
IF 3.8
Hongjian Chen,Huanjiang Niu,Yunpeng Wang,Jiannan Jia,Songle Wang,Yuwen Yuan,Pragati Awasthi,Xvsheng Qiao,Shisheng Ling,Zhenzhen Ge,Dong Chen,Wenkun Dong,Guodong Qian,Xianping Fan,Yubing Dong
Lanthanide complexes based fluorescent microspheres are widely used in lateral flow immunoassay (LFIA) measurements of small melecules, such as methamphetamine (MET), due to their efficient fluorescence. However, the easily occurred aggregation of lanthanide complexes often leads to concentration quenching effect of fluorescence, which severely deteriorate the biodetection performance of fluorescent microspheres. Here, in order to optimize the distribution of lanthanide complexes, the crosslinked agent dimethacrylate (EGDMA) is introduced in the microspheres polymerization. By adjusting the concentration of EGDMA, the aggregation of lanthanide complexes is reduced, which inhibits fluorescence quenching effect and enhances fluorescence intensity of the fluorescent microspheres. Such fluorescent microspheres thus achieve highly sensitive detection of MET, with showing a detection limit of 0.048 ng mL −1 with excellent stability. This study provides a new idea for the optimal design of lanthanide complexes dispersed fluorescent latex beads, which is expected to promote the development of advanced In Vitro Diagnostics (IVD) technologies to rapid and precise screening of small molecules.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Chaojun Fu,Fanrong Ai,Jianzhen Huang,Zhiying Shi,Xiluan Yan,Xiangjuan Zheng
Antibiotic residues have become a public health issues, the fast detection of tetracycline (Tc) in the environment is urgently required. In this work, Ti 3 C 2 quantum dots (Ti 3 C 2 QDs) and Europium ions jointly constructed a ratiometric fluorescence (FL) platform for the detection of Tc, based on synergistic impact of the Foster Resonance Energy Transfer ( FRET) from Ti 3 C 2 QDs to Eu 3+ ions and the Antenna Effect (AE) between Tc and Eu 3+ ions. And we proposed a ratiometric FL platform for detecting Tc with good linear response range (100–1000 uM) and low detection limit (48.79 nM). Meanwhile, we applied this platform to detect a serious of β-diketone ligands of Eu 3+ ions, demonstrating the platform's versatility for this category of chemical. Furthermore, based on the color changes of [email protected] 3+ from blue to red at 365 nm ultraviolet light, an intelligent detection smart device was built for the visual semi-quantitative detection of Tc in actual samples. We proved the applicability of the device in complicated samples and the potential for rapid, sensitive, intuitive and point-of-care detection in the field of environment, food, pharmaceutical and agriculture.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yang Li,Jia-Jia Li,Qing Zhang,Jian-Yong Zhang,Na Zhang,Yong-Zheng Fang,Jinwu Yan,Qinfei Ke
The highly emissive BODIPY (boron-dipyrromethene) have been grafted on the Eu-based metal-organic frameworks (Eu-MOFs) via the covalent F-B bonding using a facile one-pot solvothermal reaction. The fluorescence emission ratio of [email protected] has been applied to construct the ratiometric fluorescence sensor for the F - , H 2 O 2 and glucose detection in water solution and living cells. The produced [email protected] probe provided enhanced sensitivity, higher selectivity and lower lower limits of detection (LOD) for the detection of F - (0.1737 μM), H 2 O 2 (6.22 nM) and glucose (6.92 nM), and 5.96, 6.52 and 6.95 times lower than that for single Eu-MOF, respectively. More importantly, the probe also exhibited the lower biotoxic in living cells for bioimaging and the better visualization performance with multiplex channels. The results indicated the π-conjugated BODIPY derivative not only acted as the surfactant molecule or template agent for preferred growth, but also modulated the fluorescent emissions drastically, and thus induced excellent fluorescent detecting performances.
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