CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Chen Yang,Xinhua Chen,Minmin Mao,Xinjiang Luo,Weiqin Sheng,Zhilun Lu,Shikuan Sun,Hong He,Weitao Su,Kaixin Song
Orange-yellow luminescent Y 2- x Sr 1- y Al 4 SiO 12 : x Ce 3+ , y Mn 2+ ( x = 0.04–0.06, y = 0.1–0.6, abbreviated as YSAS: x Ce 3+ , y Mn 2+ ) phosphors with garnet structure were prepared by the high temperature solid-phase method. The matrix energy band is calculated by DFT , where YAG is 4.535 e V and YSAS is 4.874 e V. The Rietveld refinement of the XRD data indicates that Ce 3+ mainly replaces the Y 3+ sites, while Mn 2+ selectively occupies. The Gaussian peaks of the fluorescence spectrum prove that Mn 2+ occupies two luminescent centers, which are further determined by Van Uitert's empirical formula. The doping of Ce 3+ /Mn 2+ units can effectively enhance the structural rigidity of the YAG host and promote the red-shift of the emission peak position of Mn 2+ . The fluorescence decay kinetics test proves that Ce 3+ can transfer energy to Mn 2+ , and the transfer efficiency reaches 72.08% at y = 0.5. The thermal stability test of the phosphor shows the luminous intensity at 473 K still maintains 86% of the room temperature . The phosphor prepared in this experiment was combined with a blue light chip to make a w-LED device, and the performance showed Ra = 86.1, CCT = 5168 K. The above results show that the emission color of the garnet structure can be tuned by energy transfer, which is attractive for future applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
LUMINESCENCE
·
2024
·Vol. 39
·期 10
·e4912
·
IF 3.2
Congcong Hu,Wenjuan Wang,Qianwen Li,Bin Liu,Fubing Xiao,Jinquan Liu,Shengyuan Yang
Hence, N,S-CDs with photoluminescent property were simply synthesized via a one-step hydrothermal method. Combined with the commercial reagent Ce 4+ , a ratiometric fluorescence assay for ascorbic acid (AA) detection was established. Ce 4+ , possessing oxidization, could directly oxidize o-phenylenediamine (OPD) to form the yellow fluorescent product oxOPD. Under the excitation wavelength of 370 nm, oxOPD had a maximum fluorescence emission at 562 nm. Meanwhile, due to the occurrence of the inner filter effect (IFE), oxOPD quenched the fluorescence of N,S-CDs. However, ascorbic acid (AA) inhibited the oxidation of Ce 4+ , causing the fluorescence of oxOPD at 562 nm to decrease, accompanied by an increase in the fluorescence belonging to N,S-CDs at 450 nm. Thus, a Ce 4+ -assisted ratiometric fluorescence method was established for AA detection. The two fluorescence output signals in this method had opposite changing trends, which could reduce system errors and improve the accuracy. This method was successfully applied to the determination of AA in drugs and fruits.
研究领域:
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF FLUORESCENCE
·
2022
·Vol. 33
·期 1
·135-144
·
IF 2.525
Shen Jingxiang,Fan Zhefeng
A straightforward, cost-effective and biocompatible reduction approach was applied to fabricate soluble but non-luminous glutathione-stabilized copper nanocluster (GSH-CuNCs). Surprisingly, as high as 1 × 10 3 times fluorescence enhancement was acquired when Ce 3+ was injected at an extremely low concentration of only 18 µM. Ce 3+ outperformed other rare-earth metal ions in terms of inducing fluorescence amplification of the non-luminous GSH-CuNCs. Furthermore, Ce 3+ was employed as inducer for aggregation-induce emission (AIE) effect as well as reactant to coordinate with target of 2,6-pyridine dicarboxylic acid (DPA) due to the stronger coordination ability between Ce 3+ and DPA than that of Ce 3+ and GSH. As a result, the Ce 3+ /GSH-CuNCs ensemble was developed as a novel sensor to detect DPA in the "on–off" mode. When DPA was introduced into the sensor, Ce 3+ failed to interact with GSH and detached from the surface of GSH-CuNCs, leading to fluorescence quenching. In addition, static quenching process and internal filtration effect (IFE) between Ce 3+ /GSH-CuNCs and DPA were also responsible for fluorescence quenching effect. A good linear relationship was obtained from 0.3 µM to 18 µM, with a limit of detection (LOD) of 0.19 µM. The as-proposed probe displayed high specificity to DPA and provided a simple, fast rapid and cheap method for construction this type of ensemble sensors to detect other targets.
研究领域:
分析化学
·
生物传感
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 4
·3679-3683
·
IF 1.338
Li Suwen,Huang Qingqing,Jiang Yi,Hu Min
A series of Ce3+-Yb3+ co-doped CaF2 nanoparticles were prepared by a hydrothermal synthesis method. The structure, morphology, photoluminescence properties, and fluorescence dynamics were studied systemically. Under the excitation of the 5d level of
Ce3+, an efficient energy transfer from Ce3+ to Yb3+ occurred, and the efficient near-infrared emission at 900–1050 nm matching to the energy of Si band gap of Si-based solar cells was observed. The lifetime of Ce3+ decreased, and the inner
quantum efficiency increased with increasing Yb3+ concentration. The quantum efficiency dependent on Yb3+ concentration was calculated, and the maximum efficiency approached 186%. As a down-conversion luminescent convertor, this kind of material can be used in front of
Si-based solar cells to reduce thermalization loss and enhance conversion efficiency of solar cells.
研究领域:
材料科学
·
光物理学
✓ 已验证
DOI
PubMed
高影响因子
Small
·
2025
·
IF 12.1
Shuhan Chen,Jichang Sun,Chun Chen,Pengyu Meng,Liansheng Li,Qinghua Liang
Aqueous zinc-ion hybrid capacitors (ZIHCs) are emerging as promising energy storage devices owing to several desirable attributes including good safety, high power density, and good stability. However, the limited energy density mainly caused by the low specific capacity of porous carbon cathodes hinders the practical application of ZIHCs. A Ce 3+/4+ redox couple-promoted aqueous ZIHC (Ce-ZIHC) is designed with the addition of Ce 3+/4+ electrolyte additives. The Ce 3+/4+ redox couple is shown to markedly increase the specific capacity of the porous carbon cathode energy and enhance the stability of Zn 2+ stripping/plating at the Zn metal anode. Notably, the as-constructed Ce-ZIHC performs more than twice the energy density of the ZIHC with the commercial activated carbon cathode. Furthermore, the Ce-ZIHC shows a low self-discharge rate and can work stably for more than 60 000 cycles at 5.0 A g −1 . This work highlights the great potential of Ce 3+/4+ redox couple in improving the overall performance of ZIHCs toward practical application.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Yongfeng Zhu,Wenbo Wang,Yian Zheng,Feng Wang,Aiqin Wang
A series of monolithic open-cellular hydrogel adsorbents based on carboxymethylcellulose (CMC) were prepared through high internal phase emulsions (HIPEs) and used to enrich the rare-earth metals La 3+ and Ce 3+ . The changes of pore structure, and the effects of pH, contact time, initial concentration on the adsorption performance were systematically studied. The results show that the as-prepared monolithic hydrogel adsorbents possess good open-cellular framework structure and have fast adsorption kinetics and high adsorption capacity for La 3+ and Ce 3+ . The involved adsorption system can reach equilibrium within 30 min and the maximal adsorption capacity is determined to be 384.62 mg/g for La 3+ and 333.33 mg/g for Ce 3+ . Moreover, these porous hydrogel adsorbents show an excellent adsorptive reusability for La 3+ and Ce 3+ through five adsorption–desorption cycles. Such a pore hierarchy structure makes this monolithic open-cellular hydrogel adsorbent be an effective adsorbent for effective enrichment of La 3+ and Ce 3+ from aqueous solution.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
ANALYST
·
2024
·Vol. 150
·期 1
·87-93
·
IF 3.6
Haoran Yu,Ziqing Qiang,Yelin Sun,Mengyao Sun,Lei Zhang,Bohao Yu,Wen Lei,Weibing Zhang
Based on the specific hydrolytic ability of alkaline phosphatase (ALP), a novel biocompatible ratiometric lanthanide fluorescent probe based on an internal reference (CIP@SiO2-Ce/ATP-Tris) was constructed with Ce3+ as the central ion, adenosine triphosphate (ATP) as the ligand, Tris as the auxiliary ligand and ciprofloxacin (CIP) encapsulated into SiO2 nanoparticles as the reference signal. The fluorescent probe emits characteristic fluorescence at 363 nm belonging to Ce3+ as the working signal and at 435 nm belonging to CIP as the reference signal. Dephosphorylation disrupted the coordination of Ce/ATP-Tris with the enzymatic reaction of ALP, which resulted in fluorescence quenching of Ce3+. The reference fluorescence was kept stable because of the protective effect of encapsulation by SiO2. The biosensor analysis method was achieved by comparing the relationship between I435/I363 and ALP concentration. The detection limit is 0.0025 U L−1, and the linear range of detection is 0.1–20 U L−1. It was subsequently used to detect ALP in samples of fetal bovine serum and human serum, and promising results were obtained.
研究领域:
生物化学
·
医学检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROELECTRONICS RELIABILITY
·
2023
·
IF 1.6
Meiling Xie,Minghao Fang,Zhaohui Huang,Yan'gai Liu,Xiaowen Wu,Xin Min
Na 3 Gd(PO 4 ) 2 phosphors doped with rare-earth metal ions Ce 3+ and Tb 3+ were fabricated by the solid-state reaction method. Under the excitation of 340 nm light, the Ce 3+ -doped Na 3 Gd(PO 4 ) 2 phosphors exhibit a broad emission band ranging from 370 nm to 480 nm, which emitted blue light centered at 405 nm. When excited at 373 nm, the Tb 3+ -doped Na 3 Gd(PO 4 ) 2 phosphors presented a green light emission, including a strong peak located at 547 nm. In addition, both of the Na 3 Gd(PO 4 ) 2 : Ce 3+ and Na 3 Gd(PO 4 ) 2 : Tb 3+ phosphors showed excellent thermal stability at different temperatures, be specific in the Na 3 Gd(PO 4 ) 2 : Ce 3+ emission intensities at 150 °C could maintain about 84 % and the Na 3 Gd(PO 4 ) 2 : Tb 3+ could maintain about 92.9 % of those at room temperature. A prototype of the white light-emitting diodes lamp exhibiting bright white light was fabricated by using a 365 nm near-ultraviolet-emitting LED chip, combined with Na 3 Gd(PO 4 ) 2 : Ce 3+ blue phosphors, Na 3 Gd(PO 4 ) 2 : Tb 3+ green phosphors, and Na 3 Gd(PO 4 ) 2 : Eu 3+ red phosphors , which produced a high color rendering index of 89.4, and a relatively low correlated color temperature of 5496 K. Moreover, the CIE point was calculated to be at (0.3332, 0.3438), locating in the white light region. These results indicate that the as-prepared phosphors can be considered as potential candidates for ultraviolet/near-ultraviolet light-excited white light-emitting diodes applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 36
·50899
·
IF 3.125
Lingli Ni,Shanshan Li,Yongtao Liu,Xiaowu Jiang,Peng Cai,Liangdong Feng,Shizhong Zhang,Xiaoyan Gao
The development of eco-efficient and environmental friendly active anti-corrosion coatings for metallic substrates represents a fundamental milestone in many engineering applications. Herein, a new type of active corrosion protection coating was successfully synthesized simply based on waterborne polyurethane (WPU) and nanocontainer of Ce 3+ modified palygorskite (Ce-PAL). Particularly, the nanocontainer of Ce-PAL was achieved via a facile and green process by cation exchange in water. Inductively coupled plasma atomic emission spectrometry (ICP) revealed that Ce 3+ had successfully incorporated into PAL nanofibers with a loading amount of 10.334 g/kg. The salt immersion test, electrochemical potentiodynamic measurements and electrochemical impedance spectroscopy (EIS) demonstrated that the incorporation of Ce-PAL only with 2 wt% into WPU led to a significant improvement of their corrosion protection properties. Finally, according to the results of scanning electron microscopy with energy dispersive X-ray spectroscopy, the active anti-corrosion mechanism of Ce-PAL/WPU coating was proposed.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Qi Zhang,He Mei,Wantong Zhou,Xuedong Wang
Herein, we provide the first report on the effects of Ce 3+ addition on the fluorescence of copper nanoclusters (CuNCs), which have excellent optical properties and lower toxicity as compared to AgNCs and AuNCs. We synthesized glutathione-encapsulated copper nanoclusters (GSH-CuNCs) using a simple one-pot chemical reduction approach. The excitation/emission wavelengths of the GSH-CuNCs were 350/650 nm. Introduction of Ce 3+ triggered an aggregation-induced emission of GSH-CuNCs due to formation of GSH-CuNCs-Ce 3+ complexes, resulting in a prominent fluorescence enhancement (~42-fold) of the mixed system. Fluorescent intensities (FIs) for the GSH-CuNCs-Ce 3+ system were significantly quenched by introduction of p -nitrophenol ( p -NP). The aforementioned quenching mechanism resulted from an inner-filter effect producing nearly unchanged fluorescence lifetime and overlap between UV–Vis absorption of Ce 3+ and the excitation wavelength of GSH-CuNCs. Consequently, a GSH-CuNCs-Ce 3+ -based “ON-OFF” platform was constructed for fluorescent detection of p -NP in water matrices. Under optimized conditions (5-min incubation time, pH = 5.6, 20 mM Ce 3+ ), the FIs of the GSH-CuNCs-Ce 3+ system were linear for p -NP concentrations from 0.5 to 500 μM and achieved a low detection limit of 0.17 μM. Moreover, the as-constructed nanofluoroprobe demonstrated high stability and specificity to p -NP, thereby offering a simple, cheap and robust experimental method for conventional monitoring of p -NP at trace levels in real-world water samples.
研究领域:
分析化学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
Guilin Wei,Xudong Liu,Shunzhang Chen,Dadong Shao,Wenqing Yuan,Xirui Lu,Yi Xie,Xiaoyan Shu
A rapid and efficient method is preferred for immobilizing nuclear wastes . In this study, Ce 4+ , a simulated tetravalent actinide ( An 4+ ) nuclear waste, was directly introduced into the Gd 2 Zr 2 O 7 matrix (as-prepared) via spark plasma sintering (SPS) at different temperatures (1725, 1750, 1775, and 1800 °C) without a complicated lattice occupancy design. The solubility of CeO 2 could be achieved to 18.8 wt %. Most of the sintered specimens exhibited the fluorite phase, but two samples sintered at 1775 °C exhibited the pyrochlore phase due to the Ce 4+ →Ce 3+ transformation. Moreover, the samples sintered at various temperatures exhibited highly densified microstructures, in which Gd, Zr, and Ce were evenly distributed, indicating adequate immobilization results. By increasing the doping content to 60 mol%, the grain boundary of the sample sintered at 1800 °C became almost indistinguishable and exhibited slight vitrification, which was confirmed by transmission electron microscopy results. These results afforded a rapid and effective method for the immobilization of nuclear wastes in the as-prepared matrix without considering the lattice occupation.
研究领域:
材料科学
·
核废料管理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Kewei Jiang,Yawei Shao,Valeri Smolenski,Alena Novoselova,Qi Liu,Minghui Xu,Yongde Yan,Jing Yu,Milin Zhang,Jun Wang
The electrode reactions of the Ce 3+ /Ce couple in molten LiCl–KCl eutectic in the temperature range 723–823 K on solid Mo electrodes were investigated by electrochemical techniques . The mechanism of deposition of metallic cerium has been established. It was found that the cathode reaction is irreversible and proceeds in one stage. The apparent standard Gibbs energy of CeCl 3 formation from the elements was calculated. The values of enthalpy and entropy were equal: ΔH* = − 1000.2 kJ/mol, ΔS* = 166.0 J/mol·K. The conditions of high-purity cerium production have been studied. The chemical structure of cathode deposits as well as the surfaces of the crucible were investigated by XRD , ICP and SEM-EDS methods. It was established that the best results for purification of the cathode product from impurities were achieved in the range 40–60 mA/cm 2 using a two-stage electrolysis. The amounts of the main impurities in the final product were 0.005 wt% Al, 0.0021 wt% Fe, and 0.003 wt% Si. The total purity of metallic cerium after cleaning was increased up to 99.971 wt% if a vitreous carbon crucible was used.
研究领域:
冶金学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）