INORGANIC CHEMISTRY
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2018
·
IF 4.7
Rajaboopathi Mani,Huaidong Jiang,Santosh Kumar Gupta,Ziqing Li,Xiulan Duan
The europium ion probes the symmetry disorder in the crystal structure, although the distortion due to charge compensation in the case of aliovalent dopant remains interesting, especially preparation involves low and high temperatures. This work studies the preparation of the β-Ca2SiO4 (from here on C2S) particle from Pechini (C2SP) and hydrothermal (C2SH) methods, and its luminescence variance upon doping with Eu2+ and Eu3+ ions. The blue shift of the charge-transfer band (CTB) in the excitation spectra indicates a larger Eu3+–O2– distance in Eu3+ doped C2SH. The changes in vibrational frequencies due to stretching and bending vibrations in the FTIR and the Raman spectra and binding energy shift in the XPS analysis confirmed the distorted SiO44– tetrahedra in C2SH. The high hydrothermal temperature and pressure produce distortion, which leads to symmetry lowering although doping of aliovalent ion may slightly change the position of the Ca atoms. The increasing asymmetry ratio value from C2SP to C2SH clearly indicates that the europium ion stabilized in a more distorted geometry. It is also supported by Judd–Ofelt analysis. The concentration quenching and site-occupancy of Eu3+ ions in two nonequivalent sites of C2S were discussed. The charge state and concentration of europium ions in C2SP and C2SH were determined using X-ray photoelectron spectroscopy measurements. The C2S particles were studied by X-ray powder diffraction, FTIR, Raman, BET surface area, TGA/DTA, electron microscopy, XPS, and luminescence spectroscopy. The impact of citrate ion on the morphology and particle size of C2SH has been hypothesized on the basis of the microscopy images. This study provides insights that are needed for further understanding the structure of C2S and thereby improves the applications in optical and biomedical areas and cement hydration.
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高影响因子
BIOSENSORS & BIOELECTRONICS
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2020
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IF 10.257
Hua Ma,Kaiwen Chen,Bo Song,Zhixin Tang,Yundi Huang,Ting Zhang,Huanan Wang,Wenping Sun,Jingli Yuan
Development of fluorescent/luminescent probes for rapid, selective and sensitive detection of reactive oxygen species (ROS) is of great significance for understanding the roles of ROS in pathophysiological processes. In the present research, a visible-light-excitable Eu 3+ complex-based probe, Eu(L) 3 (DPBT), is designed and synthesized for the time-gated luminescence (TGL) determination of hypochlorous acid (HClO) in vitro and in vivo . The proposed probe exhibits a rapid, selective and sensitive TGL response to HClO, and excellent localization of mitochondria in living cells with low cytotoxicity. These features allow the probe to be used for the TGL sensing and imaging of HClO formation in mimic inflammatory cells at a subcellular level, as well as in endotoxin-induced liver injury and rheumatoid arthritis in live mice. In addition, by immobilizing the probe in the PEG hydrogel, the smart sensor films with rapid response to HClO were prepared, and successfully used for the real-time monitoring of HClO generation in mouse wounds, in order to distinguish the infected wounds from acute ones. Overall, this study provides a useful tool for the clinical monitoring and treatment of wound diseases.
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JOURNAL OF RARE EARTHS
·
2025
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IF 7.2
Min Li,Mingyang Han,Xinying Song,Yiming Chen,Zepeng Wu,Li Guan,Fenghe Wang,Dawei Wang,Longfeng Lv,Xu Li
Rare-earth doped carbon dots represent a new generation of nanomaterials, which achieve the functional modulation and property optimization of carbon dots materials. In this paper, Eu 3+ -doped carbon dots (Eu-CDs) were prepared employing a one-step hydrothermal approach. The structure and properties of Eu-CDs were characterize using a transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, etc. Eu-CDs exhibit a series of distinct emission peaks at 467, 595, 620 and 702 nm when excited at 395 nm, respectively. An “off-on” strategy for detecting of Fe 3+ and ascorbic acid was established on the basis of changes in luminescence peak intensity ratios of the CDs and Eu 3+ , which effectively reduces the detection limit compared with single-peak detection. The I 467 / I 595 of Eu-CDs exhibits an excellent linear association with the concentrations of Fe 3+ or ascorbic acid, and the limit of detections are 0.15 and 0.13 μmol/L, respectively, indicating that Eu-CDs can be applied for the quantitative measurement of Fe 3+ and ascorbic acid, and are successfully applied in real samples.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiajia Du,Daohai Zhang,Kunlan Diao,Teng Zhou,Kaixiang Zou,Shuhao Qin
In this study, a composite hydrogel was designed and prepared based on a simple hydrothermal method with a synergistic strategy of citric acid carbonization and rare earth coordination. Through the coordination effect of the sp 2 graphitized nucleus (0.21nm crystal surface spacing), surface functional groups and europium (Eu 3+ ) of the carbon dots (CDs), a dynamic “soft-hard” dual network structure is constructed, realizing the synergistic optimization of fluorescence-electrical-mechanical-swelling characteristics. Compared to existing rare-earth-based dual-color fluorescent hydrogels, this material uniquely achieves independent excitation/emission control at dual wavelengths (433 nm/615 nm under 317 nm/291 nm excitation), surpassing the typical single-excitation limitations of analogous systems. Studies have shown that the hydrogel exhibits a broad detection range for K + (0.1–5 mol/L) with visual fluorescence enhancement. The material's compressive strength (18 MPa at 80% strain) and dynamic self-healing ability further demonstrate its excellent mechanical stability. This work provides a novel paradigm for designing multifunctional hydrogels with integrated optical, mechanical, and responsive properties.
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MATERIALS CHEMISTRY AND PHYSICS
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2021
·
IF 4.094
Wudong Liu,Jie Zhang,Xiangbiao Yin,Xinyi He,Xinpeng Wang,Yuezhou Wei
Through a simple hydrothermal reaction , LEuH-Cl (where LEuH and Cl denote layered europium hydroxide and a chlorine ion, respectively) was synthesized. Its structure and properties were similar to those of layered double hydroxides (LDHs). The material was composed of europium hydroxide host layers with a positive charge and a guest interlayer with chlorine ions. The hydrotalcite-like structure gives it excellent anion exchange abilities, and the host shows an intense photoluminescence (PL), mainly through 5 D 0 → 7 F J (J = 0,1,2,3, and 4). MnO 4 − or Cr 2 O 7 2− can be directly adsorbed by LEuH-Cl in an aqueous solution due to the large number of exchangeable chlorine ions, thereby resulting in a static quenching effect (SQE) and forming an inner filter effect (IFE) system, which leads to the direct quenching of the PL intensity. Based on this characteristic, the concentration of these two substances in an aqueous solution can be detected quickly and simply. Based on the experimental results, LEuH-Cl exhibited high selectivity and sensitivity toward MnO 4 − and Cr 2 O 7 2− in an aqueous solution. The detection limits of MnO 4 − and Cr 2 O 7 2− were calculated to be 3.43 and 1.19 μM, respectively. This proved the feasibility of using the material for the direct detection of multiple substances. The quenching caused by the anion exchange of layered rare-earth hydroxides (LRHs) was further explored.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Ziyu Gan,Xuetao Hu,Xiaowei Huang,Zhihua Li,Xiaobo Zou,Jiyong Shi,Wen Zhang,Yanxiao Li,Yiwei Xu
A dual-emission fluorescence sensor was developed for Hg 2+ detection based on carbon quantum dots (CQDs) and Europium (III, Eu 3+ ) complexes. The CQDs modified with Eu 3+ complexes displayed dual-emission wavelengths of 443 and 617 nm. The dual-emission fluorescence intensity was significantly increased in the presence of Hg 2+ . The developed sensor displayed excellent selectivity and sensitivity with the detection range of 1–20 nM and detection limit of 0.2 nM. With increasing Hg 2+ concentrations, developed sensor showed clear and regular color alternations from strong blue, light blue, lavender to deep purple observed by the naked eyes. The dual-emission method was successfully used for visual and ultrasensitive detection of Hg 2+ in drinking water and milk samples with satisfied recovery from 97.6 % to 105.4 %. The sensor provides a generalizable platform for dual-emission fluorescence detection of Hg 2+ based on rare earth ions-modified CQDs.
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TALANTA
·
2020
·
IF 5.339
Chao Xia,Yan Xu,Meng-Meng Cao,Yun-Peng Liu,Jin-Feng Xia,Dan-Yu Jiang,Guo-Hong Zhou,Rong-Jun Xie,Da-Feng Zhang,Hui-Li Li
In the present study, a kind of Eu(III) post-functionalized Zr(IV)-based metal-organic framework (UiO-66(COOH) 2 , Zr-MOF: Eu 3+ ) was synthesized and utilized as an independently luminescent probe for sensing bilirubin (BR) in human serum, a biomarker of jaundice hepatitis. It can be served as a turn-off fluorescent switch for BR because its red emission from Eu 3+ can be easily quenched by BR through a fluorescent resonant energy transfer (FRET) process between BR and its ligands, and as a result, BR is recognized successfully. Particularly, Zr-MOF: Eu 3+ has shown many appealing properties, such as high sensitivity, quick response (less than 1 min), broad response window (0–15 μM), and excellent selectivity. Most importantly, a kind of portable test paper based on Zr-MOF: Eu 3+ probe has been developed for directly assessing the level of BR in real human serum and further diagnosing bilirubin-related diseases via visually observing the luminescent color variation.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 3
·2526-2534
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IF 2.993
Zhou Zhan,Wang Zhuosen,Tang Yiping,Zheng Yuhui,Wang Qianming
Bacillus anthracis marker (dipicolinic acid, DPA) is a biological warfare agent. The excessive amounts of the compound would lead to serious problems in human health. It is essential to develop a straightforward and rapid detection technology of DPA. For this reason, an optical sensing platform was established on a robust alginate film. Firstly, green emission CQDs were synthesized via a one-step microwave carbonization method based on citric acid and urea. In the next step, europium ions were employed to chelate the carboxyl groups of CQDs and sodium alginate was selected to assemble the green fluorescent film (CQDs-Eu film). In the presence of DPA, the emission peaks evolved from green to red region. The ratio of I 615 / I 554 linearly increased with the addition of DPA in the range of 1–45 µM with a detection limit as low as 0.17 µM. This CQDs-Eu film-based sensing nanostructure showed its potential applications in the fields of biology and food analysis.
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FOOD CHEMISTRY
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2024
·
IF 8.5
Qingxiang Liu,Xuelian Hu,Xiaoxiao Dong,Peng Liu,Ning Zhang,Zhe Gao,Wenxiu Wang,Huiling Li,Shuo Wang,Xiuying Liu,Yiwei Tang
A high-performance fluorescent “turn-on” aptasensor (Eu-MOFs@SMZ-Apt) for sulfamethazine (SMZ) determination was designed using dual-emitting europium metal-organic frameworks (Eu-MOFs) as a signal transducer and an amplifier. Eu-MOFs featuring dual emission peaks (430 nm and 620 nm) were first prepared via a facile self-assembly strategy employing Eu (III) ions and 2-aminoterephthalic acid as precursors. The high-affinity aptamer was bonded with Eu-MOFs to form Eu-MOFs@SMZ-Apt through the amidation reaction. Benefiting from the integration of inherent virtues from Eu-MOFs and aptamer, the Eu-MOFs@SMZ-Apt-based sensor allowed sensitive and selective determination of SMZ with good linear relationships in a range of 1.4–40 ng mL −1 and a low detection line (0.379 ng mL −1 ). This sensor was successfully applied to the determination of trace SMZ in real samples with satisfactory recoveries (86.47–113.52%) and a relative standard deviation (<6.51). Consequently, the Eu-MOFs@SMZ-Apt ratiometric fluorescence sensor furnishes new possibilities for the accurate detection of various pollutants in food.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Jingyi Yue,Yaoming Xiao,Yanping Li,Gaoyi Han
Multifunctional stannum oxide compact bilayer modified by europium and erbium respectively doped ytterbium fluoride (SYEu/SYEr) is designed and prepared by a convenient and low-cost spin-coating approach for dye-sensitized solar cell. The most important three functions of the compact bilayer are reducing the recombination rate of electrons as a barrier layer, enlarging the utilization of sunlight as a luminescence material both with down- and up- conversions, and enhancing the long-term stability of the device as a defender of the dye. Besides, the construction of double layer with down- and up- conversion functions has no significant influence on giving rise to quenching effect. Furthermore, these findings offer potential applications for photovoltaic device with a wide range response of sunlight via the variation in rare-earth species and cell structures.
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MICROCHIMICA ACTA
·
2014
·Vol. 182
·期 3
·753-761
·
IF 3.719
Zheng Xudong,Pan Jianming,Gao Lin,Wei Xiao,Dai JiangDong,Shi WeiDong,Yan Yongsheng
We have prepared highly monodisperse silica spheres doped with an Eu(III) complex and coated them with a nanoshell of a copper-imprinted polymer. The silica cores have a diameter of 200 nm, and the nanoshells have a thickness of 10–30 nm. The nanoparticles were characterized by means of scanning electron microscopy and transmission electron microscopy. The material is shown to be a viable fluorescent probe for Cu(II) ions. The surface molecular imprint renders the nanoprobe sensitive and selective. It was successfully applied to the detection of Cu(II) and gave a linear fluorescent response in the 10–100 μM concentration range. Compared to other methods, this one features high selectivity, sensitivity, low cost and ease of operation. We assume that this assay is applicable to routine trace determination of Cu(II) in water or biological environments. By adopting the appropriate functional monomers, cross-linking agents and template ions, the method can potentially be used to fabricate a highly selective imprinted probe for other heavy and transition metal ions.
The europium complex fluorescent probe detected the content of divalent copper by surface ion imprinting. The imprinted shell of the probe bound Cu(II) rapidly and selectively. Due to Cu(II) quenching of the fluorescent core, the fluorescence intensity decreases.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Le Liang,Su-qian Cai,Yan-li Leng,Chan Huang,Yong-qing Liu,Ye Wang,Li Luo,Mei Han,Xiao-hong Li,Xiao-hua Cai
Ciprofloxacin (CIP) and gallium (Ga) are widely used in many fields and their excessive presences will pose serious threats to the environment and life health. Therefore, developing an intelligent detection method for rapidly tracking and determination of CIP and Ga 3 ⁺ concentration in environments and organisms is of great significance. In this work, a europium-doped carbon dots (Eu-CDs) with unique structure and performances was prepared by a one-pot hydrothermal method. Eu-CDs can efficiently overcome the problem of aggregation-induced fluorescence quenching in complex environments to track CIP and Ga 3⁺ with highly sensitivity. The "antenna effect" of non-radiative energy transfer is introduced to explain the pathway on fluorescence transition of Eu-CDs through DFT theoretical calculations and mechanism investigations, which provide a theoretical basis for the design and development of novel carbon dots with specific functions. Eu-CDs can successfully be applied to fluorescence imaging in organisms, moreover, it also exhibits excellent application potentials in the field of anti-tumor and antibacterial. In addition, a portable intelligent detection platform based on Eu-CDs-hydrogel device have been developed, which provides a new strategy for rapidly detection of CIP and Ga 3⁺ in real samples.
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