MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Chaoqing Yang,Jing Liu,Liyana Ma,Aoju Li,Zhongxin Liu
Graphene oxide/GdF 3 : Yb, Er (GO/GdF 3 ) nanocomposite have been successfully synthesized via a facile low-temperature hydrothermal route, in which fusiform orthorhombic phase GdF 3 : Yb, Er nanocrystals with uniform size could grow in the graphene oxide substrate. During the annealing of GO/GdF 3 nanocomposites, a structure change from GO/GdF 3 nanocomposites to reduced graphene oxide/NaGdF 4 : Yb, Er (rGO/NaGdF 4 ) nanocomposites was discovered by X-ray powder diffraction, Fourier transform infrared spectroscopy, Thermogravimetric analysis and Scanning electron microscope. Under the excitation of 980 nm, the upconversion luminescence of GO/GdF 3 was completely quenched by the energy receptor in GO substrate, however the black rGO/NaGdF 4 showed improved green upconversion luminescence. Based on the analysis of energy transfer in the nanocomposites, the improvement of the upconversion luminescence of the rGO/NaGdF 4 can be attributed to the structure change of nanocomposites.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2017
·
IF 4.536
Yiru Zhu,Shuwen Zhao,Bin Zhou,Hao Zhu,Youfa Wang
In this work, we report a phenomenon that upconversion emission intensity of Er3+ was enhanced by cadmium. Cd2+ was taken with 0, 3, 10, 20, 30, and 40 mol % as a new dopant to codope LiY0.78Yb0.20Er0.02F4, meanwhile the doping effects on the crystal structure, morphology, and upconversion fluorescence emission are investigated by XRD, Rietveld refinement, TEM, and upconversion spectroscopy analysis methods in detail. The green upconversion emission intensity was enhanced, and the maximum emission intensities were enhanced to twice when 10 mol % Cd2+ was codoped into tetragonal LiYF4, while its decay lifetime was reduced. Additionally, we further designed the synthesis of the homogeneous LiYF4:20%Yb,2%Er,10%Cd@LiYF4 of which the emission intensity is 11 times higher than that of the Cd2+-free nanocrystals, meanwhile an intriguing morphology of core–shell nanocrystals was obtained. This investigation may be useful for the design and improvement of upconversion materials for fulfilling the prerequisite of the practical application.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yi Zhang,Weidong Guo,Donghao Liu,Yigang Ding
The recovery of rare earth elements (REEs) from discharged electronic devices or mineral waste water is highly essential but still facing challenges. In this work, two amino-functionalized carboxyl-UiO-66 (UiO-66-COOH-TETA and UiO-66-(COOH)2-ED) prepared via the postmodification method were employed as the adsorbents for Yb(III) capture. The experimental results revealed their superior adsorption capacities of 161.5 and 202.6 mg/g, respectively. Meanwhile, their adsorption processes can be described by the pseudo-second-order kinetic model and Langmuir model. Effects of initial pH and temperature on adsorptions were systematically evaluated, affording an optimal operating condition (i.e., pH of 5.5–6, T of 65 °C, t of 10 h). Moreover, the fabricated materials exhibited great reusability after five adsorption–regeneration cycles. UiO-66-COOH-TETA demonstrated good separation selectivity for Yb(III) over light REEs (i.e., 3.98 of Yb/Ce, 3.51 of Yb/Nd). Based on the density functional theory calculations and characterization analysis (XPS, Zeta, mapping, and IR), the adsorption mechanisms were mainly attributed to significant electrostatic attraction and strong surface complexation between N and O sites and Yb(III).
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jian Yu,Hongpan Zhu,Zizhen Zhou,Xiaofang Liu,Guang Han,Bin Zhang,Xu Lu,Guoyu Wang,Xiaoyuan Zhou
Mg-based compounds are emerging materials for efficient thermoelectric conversion, as exemplified by n-type Mg 3 Sb 2 -based materials, while a high performing p-type Mg 3 Sb 2 material is lacking. EuMg 2 Sb 2 , a derivative of Mg 3 Sb 2 , has revealed potential as a high-performance alternative to p-type Mg 3 Sb 2 -based materials, while pristine EuMg 2 Sb 2 suffers from low carrier concentration. Herein, we reveal that both Zn substitution for Mg and Yb substitution for Eu not only boost the carrier concentration and mobility of p-type EuMg 2 Sb 2 -based materials, but also sharply diminish the lattice thermal conductivity via enhancing phonon scattering. Band structure calculation shows that Zn substitution minimizes the energy difference between different bands at the valence band maximum and reduces the band effective mass, leading to optimized band structure. Combined with the role of Ag doping in increasing the carrier concentration and power factor, p-type Eu 0.5 Yb 0.5 Mg 1.0975 Zn 0.9975 Ag 0.005 Sb 2 sample obtains a maximal dimensionless figure of merit ( zT ) value of 1.18 at 823 K, which compares favorably to those of EuMg 2 Sb 2 and other p-type Mg–Sb-based Zintl materials. This study demonstrates the efficacy and importance of delicate composition engineering in boosting the thermoelectric performance of p-type EuMg 2 Sb 2 .
研究领域:
材料科学
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热电学
·
固体物理
✓ 已验证
DOI
高影响因子
Nano Research
·
2024
·
IF 9.5
Yang Xingru,Sheng Yuhang,Zhang Linglong,Yang Lun,Xing Fangjian,Di Yunsong,Liu Cihui,Hu Fengrui,Yang Xifeng,Yang Guofeng,Liu Yushen,Gan Zhixing
Luminescent materials with multi-emission features are difficult to be replicated, which are highly desirable for advanced anti-counterfeiting. Here, we report the pioneering synthesis of Mn 2+ /Yb 3+ /Er 3+ tri-doped Cs 2 Ag 0.8 Na 0.2 InCl 6 double perovskites (MYE-DP), which exhibit photoluminescence (PL) covering from visible to near-infrared (NIR). The PL colors under excitations of 254 and 365 nm are notably different due to the changed relative emission intensities of self-trapped excitons (STEs) and Mn 2+ d–d transition. Moreover, under the excitation of a NIR laser, the MYE-DP exhibits upconversion (UC) emissions of Mn 2+ and Er 3+ . After ceasing the excitation, the long-lived trapped electrons can be thermally released to Mn 2+ and Er 3+ ions, resulting in both visible and NIR afterglow. Based on multi-modal emissions of the MYE-DP, we demonstrate a five-level anti-counterfeiting strategy, which significantly increases the anti-counterfeiting security. In addition, this work provides valuable insights into the energy transfer between STEs, Mn 2+ , Ln 3+ , and traps, laying a solid foundation for future development of new lead-free perovskites.
研究领域:
材料科学
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光学
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化学
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物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 109
·期 1
·e70407
·
IF 3.8
Yuwei Zhang,Cuiwei Li,Guangjin Chen,Chenran Zhao,Zhikun Song,Kepi Chen,Haoran Sun,Linghao Wu,Junhui Xiang
A series of (Y, Yb, Zr, Hf, Sn, W)O 2−δ high-entropy ceramics with varying mole fraction of main elements were synthesized for the first time through the solid-state reaction synthesis method. The microstructure, phase composition, and properties of the prepared materials were thoroughly analyzed and tested. The results indicate that the phase composition transformed from a single-phase fluorite structure to a single-phase C-type rare earth sesquioxide structure as the mole fraction of +3 cations increases. The thermal conductivity of the prepared high-entropy ceramics with porosity of 49.8%–50.1% is very low ranging from 0.33 to 0.37 W·m −1 ·K −1 . Among them, the single-phase C-type rare earth sesquioxide with a higher oxygen vacancy concentration was employed as a catalyst in the CO 2 hydrogenation reaction, attaining a high CO 2 conversion rate of 82.0%. The obtained results have deepened understanding of the role of oxygen vacancies and have important guiding significance for the study of high-entropy oxides with fluorite derived structures.
研究领域:
材料科学
·
陶瓷
·
催化
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能源材料
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固态化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Qianqian Song,Hao Chen,Kanghui Zheng,Yueling Lai,Zhongshan Li,Xin Yang,Ruilin Wang,Yufeng Zhou
Lanthanide-doped upconversion nanoparticles (UCNPs) are extensively used in spectral conversion layers of photovoltaic (PV) devices to capture near-infrared (NIR) light. However, surface quenching effects and low upconversion quantum yield (UC QY) of UCNPs limit their utilizations in PV devices. In this work, novel multishell NaYF 4 @NaYF 4 : Yb, Er@NaYF 4 (CSS) UCNPs have been synthesized via thermal decomposition method. The CSS UCNPs exhibit enhanced UC emission intensity by 36.33 times and UC QY by 38 times with respect to those of NaYF 4 : Yb, Er UCNPs, with a significant increase in fluorescence lifetime. After incorporating CSS UCNPs with Cadmium Telluride (CdTe) solar cells, the device achieved a power conversion efficiency (PCE) of 16.02% under AM 1.5G illumination, a 5.9% increase compared to the bare CdTe solar cell, and exhibited more than a 76-fold enhancement in efficiency under 980 nm excitation. This study demonstrates the synergistic effects of the multilayer shell structural UCNPs with enhanced luminescence and engineered interfaces between CdTe and back electrode, offering a scalable strategy for efficient infrared-responsive photovoltaic devices.
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DOI
高影响因子
Materials Today Chemistry
·
2026
·
IF 6.7
Sara Adeeba Ismail,Wenqi Lei,Lulu Jiang,Donglin Han
Ba 7 Nb 4 MoO 20 is a pure oxide ion conductor in both dry and wet oxygen atmospheres at the operating temperature of solid oxide fuel cells and has the promising potential to be applied as electrolyte materials. In this work, donor-doping trivalent rare earth elements R ( R = Y, Ce, Nd, Ho, Er and Yb) to replace the divalent Ba cations increases oxygen content slightly, but effectively enhances oxide ion conduction. Although the solubility of these dopants is less than x = 0.02 in Ba 7- x M x Nb 4 MoO 20+0.5 x , the Ba 6.98 Er 0.02 Nb 4 MoO 20.01 composition exhibits the highest conductivity, reaching 0.0066 and 0.0085 S cm −1 at 700 and 800 °C, respectively, nearly 6 times higher than that of pristine Ba 7 Nb 4 MoO 20 . H 2 O/D 2 O isotope effect measurement verifies that these materials are essentially pure oxide conductors even in wet atmospheres. It is hard to believe that the trace-level dopant concentration can influence the conduction behavior effectively. However, the slight change in the oxygen content, particularly in the BaO 2 conduction plane, is possible to influence the conductivities. The oxygen occupancy in the O1 and O5 sites thereby seems to be highly sensitive to and dependent on the occupancy of the dopants over the Ba and Nb/Mo sites.
✓ 已验证
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DOI
高影响因子
DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 13
·5800-5807
·
IF 4.177
Ai-Hua Li,Mengyun Lü,Jun Yang,Lin Chen,Xiaohong Cui,Zhijun Sun
Sub-20 nm core–shell and water-soluble SrF2:Yb,Tm@CaF2:Gd heteronanoparticles with both upconversion luminescence (UCL) and magnetic resonance imaging (MRI) capabilities were designed and synthesized via a two-step hydrothermal method. In the design of the heteronanoparticles, SrF2:Yb,Tm nanoparticles with high UCL efficiency are chosen as the core material for strong UCL output; and by epitaxially coating the SrF2:Yb,Tm core particles with inert and biocompatible shells of CaF2:Gd, the core–shell heteronanoparticles are endowed with a magnetic capability (longitudinal relaxivity of 2.4 mM−1 s−1) for MRI, as well as an enhancement of the near infrared (NIR) UCL by 9.2 times. The aqueous dispersion of SrF2:Yb,Tm@CaF2:Gd heteronanoparticles with a concentration of 2.6 wt% can emit NIR UCL so as to be easily detected with a fiber optical spectrometer under illumination of a 975 nm laser diode with a power density of 8.8 W cm−2. Such a dispersion with a Gd3+ concentration of 0.0143 mM in the shell region of the heteronanoparticles can also generate the detectable quickening of longitudinal relaxation. The results promise the strong potential of this nanomaterial for applications in bioimaging as a dual-functional probe.
研究领域:
纳米技术
·
生物医学成像
·
材料科学
·
分子诊断
·
诊疗一体化
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 14
·145504
·
IF 3.551
Zixiao Zhao,Jiawei Shen,Min Wang
Numerous investigations have been devoted to visualizing latent fingerprints (LFPs) for personal identification in forensic investigation and age estimation. While simultaneous detection of chemicals in fingerprint residues has yet to be explored. Herein, fluorescent NaYF4:Yb/Tm up-conversion nanoparticles (UCNPs), which can emit blue fluorescence upon 980 nm near-infrared irradiation, have been employed in the imaging of LFPs with high contrast and high sensitivity. The furrows and ridges which provide detailed information of LFP have been displayed clearly by Tm-doped UCNPs. Meanwhile, the quantitation of nicotine residue in LFPs has been achieved based on the blue fluorescence absorbed by I2-nicotine complex, and the data was analyzed by MATLAB with modified OPTA algorithm. It was proved that the established strategy was specific, sensitive, reliable and practical toward nicotine residue in LFPs with a detection limit of 0.05 μg.
研究领域:
法医学
·
材料科学
·
化学分析
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2026
·Vol. 40
·期 5
·e70572
·
IF 4.3
Quanfeng Ye,Lingyi Li,Zhijun Xia,Chenyi Zhang,Jie Zhang
Near-infrared (NIR) luminescent rare-earth complexes are highly sought-after for bioimaging and optical communication due to their distinctive optical characteristics. Herein, a series of Nd 3+ and Yb 3+ complexes were synthesized via a multistep protocol: first, forming an intermediate ligand–metal framework from appropriate precursors; then, coordinating with NdCl 3 ·6H 2 O or YbCl 3 ·6H 2 O; and finally, modifying with specific organic reagents. Their NIR luminescence properties were systematically investigated, revealing characteristic emission bands corresponding to the f-f electronic transitions of Nd 3+ and Yb 3+ . The energy transfer processes within the complex structures and the influence of the ligand environment on emission intensity and lifetime were analyzed. These results offer insights into designing efficient rare-earth NIR luminescent materials, which show promise for NIR-based applications such as bioimaging and optical communication.
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2026
·
IF 4.4
Xiayuan Zhu,Shuyuan Liu,Xuan Cao,Qi Zou,Weiwei Li,Shanshan Qu,Chao Liu,Xinru Dai,Guoyuan Yuan
Achieving efficient separation of ytterbium (Yb) and lutetium (Lu) is of great significance for the production of medical isotope lutetium-177 (177Lu). In this work, phosphonic acid-functionalized polyacrylonitrile nanofibers (PPA–PAN-NFs) were successfully prepared by combining electrospinning and postmodification, as verified by comprehensive characterization techniques (e.g., SEM, BET, CA, FT-IR, and XPS). The PPA–PAN-NFs demonstrated favorable adsorption capacities for Yb(III) and Lu(III), 52.17 mg/g and 66.45 mg/g, respectively, which surpass the capacities of most materials reported in the literature. XPS analysis revealed that the adsorption mechanism involves coordination of lanthanide ions with the oxygen atoms of phosphonic acid groups and the nitrogen atoms of amine groups. Differences in coordination affinity induced by lanthanide contraction serve as key drivers for the efficient separation of these ions. The feasibility and selectivity of PPA–PAN-NFs for the separation of Yb (III) and Lu (III) have been evaluated by means of dynamic column separation. Effective separation can be realized when the chromatography column has a height of 3.0 cm and a diameter of 1.6 cm, with 1.5 g of PPA–PAN-NFs loaded and 0.1 mol/L HNO3 used as the eluant. The recovery rate of Lu(III) reached 82%, with a separation factor of 14.91 for Yb(III)/Lu(III), indicating high selectivity in the separation process. This study applies nanofiber materials to medical radionuclide separation. It provides an alternative approach for 177Lu separation and is also valuable for the development of nanofiber-based methods in radionuclide separation.
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产品关联
DOI
PubMed
高影响因子
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