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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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 4
·1-11
·
IF 5.3
Ma Minghao,Hu Wei,Luo Shengdong,Pei Fubin,Lei Wu,Wang Jiang,Tong Zhaoyang,Liu Bing,Du Bin,Hao Qingli,Mu Xihui
Horseradish peroxidase (HRP) was used as a model glycoprotein, and a molecularly imprinted ratiometric fluorescence sensor based on a smartphone (NEB@MIP) was constructed using the sol–gel method for the fluorescence and visual detection of HRP. The sensor consisted of boronic acid-functionalized metal–organic frameworks (Eu-MOF-B(OH) 2 ) and nitrogen-doped carbon dots (N-CDs). The Eu-MOF-B(OH) 2 surface can not only load abundant N-CDs but also covalently bind with HRP through its boronic acid groups. The NEB@MIP exhibited two fluorescence emission peaks at 450 nm and 616 nm. When HRP was present, the fluorescence was quenched due to the internal filtering effect (IFE), but the quenching of N-CDs was more pronounced. Furthermore, the concentration of HRP in the range 0.05–10 µM showed a good linear relationship with the ratio of fluorescence intensity at 616 nm and 450 nm, with a detection limit (LOD) of 0.01 µM. Meanwhile, the sensor displayed a noticeable change in fluorescence color under different concentrations of HRP targets. Moreover, the sensor achieved satisfactory results in detecting simulated real samples, with recoveries ranging from 92.0% to 98.5% and RSDs between 1.5% and 3.3%. The detection platform based on the smartphone also performed well when detecting HRP in simulated real samples. Thus, this work provided a new approach for the portable detection of HRP. The method provides a new idea for the combination of ratiometric fluorescence molecular imprinting of glycoproteins and the portable detection platform of smart phones. Graphical
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Xuequan Jing,Meina Guo,Jiarong Li,Wei Xu,Haonan Qin,Weidong Xiao,Yinhua Wan,Jieliang Chen,Zhangwei Yao,Weijie Song,Hongdong Yu,Kang Hu,Tinggang Li
The overuse of quinolone antibiotics has led to a series of health and environmental issues. Herein, we combine the distinct luminescence properties of Eu 3+ with the unique structure of covalent organic frameworks (COFs) to develop a precise and sensitive fluorescent probe for detecting Flumequine (Flu) in water. Eu 3+ is thoroughly anchored into the channels of COFs as recognition sites, while the synthesized probe material still maintains its intact framework structure. The unique structure of COFs provides excellent support and protection for Eu 3+ . Therefore, COF-Eu can rapidly bind with Flu which can transfer the absorbed energy to Eu 3+ through an “antenna effect”, resulting in red fluorescence. Moreover, there is a good linear relationship between Flu concentration in the range of 0–30 µM, with a detection limit of 41 nM. Simultaneously, the material maintains remarkable reproducibility, with its performance remaining almost unchanged after five cycles of use. Remarkably, the probe demonstrates excellent Flu recovery rates in real samples. This study provides a viable approach for the recognition of flumequine in the environment through a customized fluorescence detection method.
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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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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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OPTICAL MATERIALS
·
2025
·
IF 4.2
Aihua Zhou,Chengguo Ming,Yumiao Pei,Yuanxue Cai,Tingting Guo,Hanbo Li
Reasonable modulation of temperature-dependent luminescence color has attracted significant attention due to its promising applications in anti-counterfeiting and temperature sensing. Although research on thermochromic materials is growing, the detailed exploration of the causes remain insufficiently explored. In this study, we successfully synthesized SrMoO 4 :Tb/Eu samples exhibiting thermal-responsive color tuning. Under 280 nm excitation, the intensity ratio of Eu 3+ ( 5 D 0 → 7 F 2 ) to Tb 3+ ( 5 D 4 → 7 F 5 ) in SrMoO 4 :0.08Tb/0.12Eu gradually increases from 0.81 to 5.8 over the temperature range of 303K–573K, accompanied by a distinct color shift from red to yellow. Experimental investigations demonstrated that the thermochromic behavior of the sample is primarily governed by nonradiative relaxation rates and local site symmetry. These results indicated that the samples can have potential for anti-counterfeiting and temperature sensing, particularly suitable as temperature sensing in the high-temperature reactor observation window.
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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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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiaodong Wei,Yulong An,Zhenyu Bu,Huidi Zhou,Jianmin Chen
Rare-earth (RE) oxide-doped La 2 (Zr 0.7 Ce 0.3 ) 2 O 7 (LZC) has attracted great interest in thermal barrier coatings (TBCs) because of its lower thermal conductivity . However, studies on the laws governing the effect of different types of RE oxide doping on the performance of LZC ceramics are limited. Therefore, in this study, different types of RE (Sc, Y, Gd and Eu) doped LZC ceramic bulks have been prepared using solid phase reaction method. The effects of RE doping on the crystal structure, mechanical properties and thermal properties of the LZC ceramics were investigated. The results indicated that all five ceramics exhibited a single pyrochlore phase structure, whereas their lattice constants were reduced after doping, with (La 0.85 Sc 0.15 ) 2 (Zr 0.7 Ce 0.3 ) 2 O 7 having the lowest lattice constant. The effect of rare earth doping on the grain growth of LZC was not evident; however, it could significantly improve the hardness of LZC. In addition, doping with all four RE ions significantly reduced the thermal conductivity of the LZC ceramics, and the most significant reduction was observed for Gd 3+ doping.
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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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