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Tuning magneto-dielectric properties of Co_(2)Z ferrites via gd doping for high-frequency applications

Chinese Physics B 2023年第9期32卷 468-473页

作者：武剑卢冰张颖陈一鑫孙凯陈大明李强刘颖力李颉 State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China School of Materials Science and Engineering Hainan UniversityHaikou 570228China School of Instrument and Electronics North University of ChinaTaiyuan 030000China

Magneto-dielectric properties of Co_(2)Z ferrite materials are tuned via gd doping for applications in high-frequency antennas and filters in the present ***_(3)Co_(2)Fe_(24-x)gd_(x)O_(41)(x=0.00,0.05,0.10,0.15,and 0.20)materials are successfully prepared by using solid-state method at 925℃for 4 h with 2.5-wt%Bi_(2)O_(3)sintering *** content of gd^(3+)ion can affect micromorphology,grain size,bulk density,and magneto-dielectric properties of the *** gd^(3+)ion content increasing,saturation magnetization(Ms)first increases and then *** maximum value of Ms is 44.86 emu/g at x=***,sites occupied by gd^(3+)ions can change magnetic anisotropy constant of the *** anisotropy constant(K_1)is derived from initial magnetization curve,and found to be related to spin-orbit coupling and intersublattice interactions between metal *** real part of magnetic permeability(μ′)and real part of dielectric permittivity(ε′)are measured in a frequency range of 10 MHz-1 *** x=0.15,material has excellent magneto-dielectric properties(μ′≈12.2 andε′≈17.61),low magnetic loss(tanδμ≈0.03 at 500 MHz),and dielectric loss(tanδε≈0.04 at 500 MHz).The results show that gd-doped Co_(2)Z ferrite has broad application prospects in multilayer filters and high-frequency antennas.

关键词： Co_(2)Z ferrite magneto-dielectric properties gd doping high-frequency applications

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Influence of gd doping on the absolute quantum efficiency and lifetime of Eu_xgd_(1-x)(TTA)_3 phens

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Chinese Chemical Letters 2014年第6期25卷 892-896页

作者： Ting-Ting Dai Lei Liu Dong-Liang Tao Shi-Gang Li HongZhang Yu-Min Cui Yong-Zhong Wang Ji-Tang Chen Kun Zhang Wen-Zhong Sun Xiao-Yun Zhao gel Liu College of Chemistry and Chemical Industry Fuyang Normal College Fuyang 236041 China Anhui Provincial Key Laboratory for Degradation and Monitoring of Pollution of the Environment Fuyang 236041 China School of Physics and Electronic Science Fuyang Normal College Fuyang 236041 China

Absolute quantum yield （Ф） is one of the most important parameters to evaluate the potential of novel materials. Lanthanide complexes Euxgd1-x（TTA）3phens are synthesized with the ratio of gd3＋ dopant concentration ranging from 10% to 90% to improve the absolute quantum yield. Euxgd1-x（TTA）3phens possess similar infrared and ultraviolet spectra, showing that they have similar molecular structures. The absolute emission quantum yields of Euxgd1-x（TTA）3phens are determined using a fluoromax-4 spectrofluorometer equipped with an integrating sphere. The fluorescence lifetimes of the Euxgd1-x（TTA）3phens are measured in the same experiment. It was found that both absolute quantum yields and fluorescence lifetimes of Euxgd1-x（TTA）3phens are of quasi-periodic variation with the change of the gd3. dopant concentrations. The absolute quantum efficiency and fluorescence lifetime vary with respect to the gd content in an opposite fashion, indicating that the rate of energy absorption by the Euxgd1-x（TTA）3phens and the conversion to light energy is critical for the absolute quantum efficiency. The radiative rate constant Kr and non-radiative rate constant Knr are calculated. The dependence of Kr and Knr on the gd3＋ dopant concentrations is very similar to that of absolute quantum efficiency. The radiation rate constant Kr and absolute quantum efficiency have a linear relationship.

关键词： JEuropium complexes gd doping Absolute quantum yield Fluorescent lifetime

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Constructing bimodal nanoprobe based on gd:AgInS_(2)/ZnS quantum dots for fluorometric/magnetic resonance imaging in mesenchymal stem cells

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Journal of Materials Science & Technology 2023年第17期148卷 116-122页

作者： Dan Yang Xian Wei Zhiyan Piao Zhongjie Cui Haiyang He Zhuoqi Wen Wanlu Zhang Le Wang Shiliang Mei Ruiqian Guo Institute for Electric Light Sources School of Information Science and TechnologyFudan UniversityShanghai 200433China College of Electronic and Optical Engineering&College of Flexible Electronics Nanjing University of Posts and TelecommunicationsNanjing 210023China Academy for Engineering and Technology Fudan UniversityShanghai 200433China Zhongshan-Fudan Joint Innovation Center Zhongshan 528437China Yiwu Research Institute of Fudan University Yiwu 322000China

Mesenchymal stem cells(MSCs)hold great promise in regenerative medicine and received overwhelm-ing concerns to promote their therapeutic *** to the shortage of MSCs-specific biomarkers,bimodal imaging nanoprobes with integrated complementary information are of great importance in ameliorating the efficacy of MSCs terminal *** this study,a noninvasive dual-mode imaging nanoprobe with enhanced detection sensitivity and spatial resolution based on alloyed gd:AgInS_(2)/ZnS quantum dots(QDs)was first fabricated through a microwave-assisted heating *** QDs with red emissive fluorescence exhibit excellent biocompatibility in MSCs under a confocal *** for magnetic resonance imaging(MRI),the longitudinal relaxation rate of 11.1420 mM^(-1) S^(-1) of gd:AgInS_(2)/ZnS QDs was achieved,which was 1.7 times higher than that of commercial MRI contrast agent(6.4667 mM^(-1) S^(-1)).Furthermore,the cellular internalization of gd:AgInS_(2)/ZnS QDs exerts no significant effect on the adipogenesis of MSCs and is conducive to the observation of further adipogenic *** work helps to verify the promising prospect to develop a bimodal nanoprobe of fluorescence/MRI based on gd:AgInS_(2)/ZnS QDs,which could monitor the differentiation and migration of MSCs for further therapeu-tic approach.

关键词： AgInS_(2)quantum dots gd doping Dual-mode imaging Mesenchymal stem cells Differentiation

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