期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到9,184篇文章
< 1 2 … 250 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Reduced-temperature ordering of FePt nanoparticle assembled films by Fe30Pt70/Fe3O4 core/shell structure 认领 引用
1
作者 贺淑莉 彭印 +4 位作者 刘丽丽 姜宏伟 刘丽峰 郑鹉 王艾玲 《Chinese Physics B》 CAS 2007年第11期3536-3540,共5页
In this paper, Fe30Pt70/Fe3O4 core/shell nanoparticles were synthesized by chemical routine and the layered polyethylenimine （PEI）-Fe30Pt70/Fe3O4 structure was constructed by molecule-mediated self-assembly techniqu... In this paper, Fe30Pt70/Fe3O4 core/shell nanoparticles were synthesized by chemical routine and the layered polyethylenimine （PEI）-Fe30Pt70/Fe3O4 structure was constructed by molecule-mediated self-assembly technique. The dimension of core/shell structured nanoparticles was that of 4nm core and 2 nm shell. After annealing under a flow of forming gas （50%Ar2＋30%H2） for 1 h at or above 400℃, the iron oxide shell was reduced to Fe and diffused to Pt-rieh core, which leaded to the formation of L1. phase FePt at low temperature. The x-ray diffraction results and magnetic properties measurement showed that the chemical ordering temperature of Fe30Pt70/Fe3O4 core/shell nanoparticles assembly can be reduced to as low as 400℃. The sample annealed at 400℃ showed the eoereivity of 4KOe with the applied field of 1.5T. The core/shell structure was suggested to be an effective way to reduce the ordering temperature obviously. 展开更多
关键词 FePt core/shell structure nanoparticles magnetic properties
暂未订购 下载PDF
SYNTHESIS AND PROPERTIES OF ORGANO-FLY ASH/POLY ANILINE WITH CORE/SHELL STRUCTURE BASED ON EMULSION POLYMERIZATION 认领 引用 被引量：3
2
作者 Xi-ping Lei Qi Su Juan Fan 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2012年第6期808-814,共7页
Organo-fly ash(OFA)was prepared with pretreated fly ash(FA)and hexadecyltrimethyl ammonium bromide(HDTMAB),and the composites composed of OFA and polyaniline were obtained by emulsion polymerization at different OFA w... Organo-fly ash(OFA)was prepared with pretreated fly ash(FA)and hexadecyltrimethyl ammonium bromide(HDTMAB),and the composites composed of OFA and polyaniline were obtained by emulsion polymerization at different OFA weight ratios(2.0 wt%,5.0 wt%,10.0 wt%,15.0 wt%and 20.0 wt%)in the presence of dodecylbenzenesulfonic acid as dopant and emulsifier.A polymerization procedure was supposed.The electrical conductivities of the composites were tested by the four-probe technique.The chemical structure and crystallinity of the composites were confirmed by FT-IR and X-ray diffraction,respectively.Morphologies of FA,OFA and the composites were observed by SEM.The element analysis was performed by energy dispersive spectrometry.The thermal stability of the composites was analyzed by TGA.The results showed that the electrical conductivity of the composites decreased with increasing the feed weight ratio of OFA,and the lowest value was 0.62 S/cm.HDTMAB and PAn were just adsorbed on the surface of FA and OFA,respectively according to the physical adsorption without destroying the crystalline structure of FA or OFA.The surface became smoother after organification of FA by using HDTMAB,and its content on FA surfaces was about 26.9 wt%.The core/shell structure of the composite was observed by SEM analysis.The composites showed a higher thermal stability than pure PAn by introduction of OFA into this polymerization system,the heat stability of PAn was increased by decreasing 31.8 wt%of weight loss after introducing 20 wt%of OFA. 展开更多
关键词 Fly ash Polyaniline Hexadecyltrimethyl ammonium bromide Core/shell Emulsion polymerization.
暂未订购 下载PDF
Synthesis and Properties of Water-soluble CdSe/ZnS Nanocrystals with the Type-I Core/Shell Structure 认领 引用
3
作者 王德平 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2008年第5期600-605,共6页
The synthesis of CdSe/ZnS core/shell nanocrystals though aqueous phase using the coprecipitation method was reported. The influences of factors such as injection methods and dosages of precursors, reaction duration of... The synthesis of CdSe/ZnS core/shell nanocrystals though aqueous phase using the coprecipitation method was reported. The influences of factors such as injection methods and dosages of precursors, reaction duration of water-bathing and the initial CdSe：ZnS molar ratio were discussed. In comparison to the CdSe plain core nanocrystals, the CdSe/ZnS core/shell nanocrystals show much brighter photoluminescence demonstrated by the photoluminescence spectra. The epitaxial growth of the core/shell structures was verified by TEM and XRD. 展开更多
关键词 nanocrystals CdSe/ZnS core/shell synthesis of aqueous phase fluorescence
暂未订购 下载PDF
Sonochemical Synthesis of Core/Shell Structured CdS/TiO2Nanocrystals Composites 认领 引用 被引量：4
4
作者 WANG Zhiyu YU Zhongping +3 位作者 LIU Bo YE Bo QIAN Guodong FAN Xianping 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2009年第5期698-701,共4页
A simple sonochemical route for the surface coating of titanium dioxide on cadmium sulfide nanocrystal was reported.After 2 h ultrasonic irradiation treatment,the mixture of CdS nanocrystals and tetrabutyl titanate in... A simple sonochemical route for the surface coating of titanium dioxide on cadmium sulfide nanocrystal was reported.After 2 h ultrasonic irradiation treatment,the mixture of CdS nanocrystals and tetrabutyl titanate in an aqueous medium yielded CdS/TiO2 nanocrystals composites with core/shell structure.The thickness of TiO2 layer with smooth interface could be easily controlled via changing the concentration of the precursors and the time of irradiation.The core/shell nanocrysrals were characterized by X-ray diffraction,transmission electron microscope and UV-vis spectrometry techniques.The prepared semiconductor composites with particular band structure present appealing properties especially in photochemical activity. 展开更多
关键词 core/shell CdS/TiO2 sonochemical photochemical activity
暂未订购 下载PDF
Enhanced green emission from La0.4F_3:Ce0.45,Tb0.15/TiO_2 core/shell structure 认领 引用
5
作者 T.K.Srinivasan B.S.Panigrahi +2 位作者 N.Suriyamurthy P.K.Parida B.Venkatraman 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第1期20-26,共7页
Nano sized La0.4F3：Ce0.45,Tb0.15（core）, La0.4F3：Ce0.45,Tb0.15（Ti O2）（core） shell, La0.55F：Ce0.45, and La0.85F3：Tb0.15 particles were synthesized by adopting co-precipitation technique in acidic environment a... Nano sized La0.4F3：Ce0.45,Tb0.15（core）, La0.4F3：Ce0.45,Tb0.15（Ti O2）（core） shell, La0.55F：Ce0.45, and La0.85F3：Tb0.15 particles were synthesized by adopting co-precipitation technique in acidic environment and coated with Ti O2 to form a core-shell structure by adopting a mechanical dispersion method at room temperature. The synthesized materials were characterized using X-ray diffraction（XRD）, transmission electron microscopy（TEM）, Fourier transform infrared spectroscopy（FTIR）, ultraviolet-visible spectroscopy（UV-Vis） absorption, photoluminescence and lifetime spectroscopy. The crystal structure of La0.4F3：Ce0.45,Tb0.15 remained the same as La F3 after being doped with Ce and Tb ions but with a slight decrease in the lattice parameter. TEM image confirmed the formation of a core-shell structure. The La0.4F3：Ce0.45,Tb0.15/Ti O2 exhibited Tb3＋ fluorescence enhancement by a factor of 1.76. Scintillation from the synthesized materials was also observed under X-ray excitation. 展开更多
关键词 core-shell cerium terbium luminescence lanthanum fluoride scintillation rare earths
暂未订购 下载PDF
Synergistic Enhancement of Mechanical and Tribological Properties in TiB2/Mo Composites via Core-Shell Structure Mediated Dislocations Migration 认领 引用
6
作者 Dongting Li Liyu Zhou +6 位作者 Jie Yu Wanjie Sun Kaiqiang Wang Lu Wang Renquan Wang Chang Liu Ying Liu 《Rare Metals》 SCIE EI CAS CSCD 2026年第4期729-743,共15页
Ceramic reinforcement is crucial for crafting ultrastrong and wear-resistant metallic components.However,pronounced stress concentration and strain incompatibility at ceramic-metal interfaces often trigger microcrack ... Ceramic reinforcement is crucial for crafting ultrastrong and wear-resistant metallic components.However,pronounced stress concentration and strain incompatibility at ceramic-metal interfaces often trigger microcrack initiation and ceramic spalling exacerbating friction under sliding conditions.This study presents a heavily reinforced TiB2/Mo composite(20 vol%TiB2)that exhibits remarkably reduced friction-wear and enhanced strength-ductility synergy.Relying on a"borrowing-dislocations"strategy,the TiB2/Mo composite enables ultrahigh strength and excellent wear resistance-lubrication simultaneously,it provides a gigapascal compressive strength of 1987±45 MPa with an engineering strain of about 19.7%and a high hardness of680±28 HV5 combining the low friction coefficient of 0.332 and wear rate of 3.38×10-5 mm3 N-1 m-1 under 30 N(contact stress 3.1 GPa).These outstanding properties stem from the formation of a Mo-Mo2B-(Mo,Ti)B2 dislocation-slip channel,such a self-assembled core-shell structure with coherent interfacial bonding facilitates dislocation transfer from the metal matrix into the ceramic phase during deformation.The unique core-shell structure effectively mitigates interfacial stress concentration enabling an exceptional combination of strength and ductility.The significant friction reduction is attributed to the in situ formation of a wear-induced oxide film,high damage tolerance,and effective load support during repetitive sliding.This study provides new insights to overcome the strength-ductility trade-off and enhance wear resistance in metal matrix composites via the"borrowing-dislocations"strategy. 展开更多
关键词 core‑shell structure mechanical properties Mo composites tribological properties
暂未订购 下载PDF
ZIF-Derived Co@Fe-P Electrocatalyst With Core-Shell Structure for Efficient Oxygen Evolution Reaction 认领 引用
7
作者 Hongyu Gong Henghui Chen +6 位作者 Wanghuan Duan Yandi Rao Ailing Song Xiaorui Wang Jing Wang Yaru Zhang Tifeng Jiao 《Carbon Energy》 SCIE EI CAS CSCD 2026年第2期34-43,共10页
Rational design of non-noble electrocatalysts with high performance for oxygen evolution reaction(OER)still remains a challenge.In this study,a ZIF-derived electrocatalyst(Co@Fe-P)with a core-shell structure is design... Rational design of non-noble electrocatalysts with high performance for oxygen evolution reaction(OER)still remains a challenge.In this study,a ZIF-derived electrocatalyst(Co@Fe-P)with a core-shell structure is designed by using Co-compounds as the core and PO43-decorated Fe-compounds as the shell.The inner Co-core and outer Fe-shell are connected through Co-O-Fe and Fe-O-P linkage.The Co@Fe-P electrocatalyst exhibits an enhanced performance for OER with a low overpotential(280 mV),low Tafel slope(41.9 mV dec-1)at 10 mA cm-2,and a 60-h durability.The electron transfer from the CoOOH-core to the FeOOH-shell is greatly facilitated,which improves the OER activity of Co@Fe-P kinetically.Theoretical calculations indicate that the interaction of Co-O-Fe and Fe-O-P in Co@Fe-P reduces the overlap between the O 2p and Fe 3d orbitals,which greatly facilitates the transformation from*OH to*O during the OER process via the adsorbate evolution mechanism(AEM)pathway.This finding provides insight for the design of efficient electrocatalysts for OER. 展开更多
关键词 Co@Fe‐P core‐shell structure OER ZIF‐derived electrocatalyst
暂未订购 下载PDF
Design of CoSn2/Sn@C core-shell structure for stable lithium-ion batteries 认领 引用
8
作者 Dan ZHANG Lu-zhen GUO +5 位作者 Da-xu ZHANG Wen-qiang FANG Yuan-hang GAO Zuo-su QIN Ning ZHANG Gen CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第5期1659-1671,共13页
To mitigate the issues of severe volume expansion(>259%)and electrode pulverization in Sn-based anodes(theoretical specific capacity:993 mA·h/g)for next-generation lithium-ion batteries(LIBs),we designed a CoS... To mitigate the issues of severe volume expansion(>259%)and electrode pulverization in Sn-based anodes(theoretical specific capacity:993 mA·h/g)for next-generation lithium-ion batteries(LIBs),we designed a CoSn2/Sn@C core−shell structure to accommodate the volume change and stabilize the cycling performance of LIBs.The Co3O4/SnO2 nanocubes were firstly prepared from CoSn(OH)6 precursor via a sintering and oxidation process in an air atmosphere.Subsequently,glucose was coated on Co3O4/SnO2 nanocubes,and then the composites were sintered under a reduction atmosphere to form CoSn2/Sn@C nanocubes with a core−shell structure.The CoSn2/Sn@C nanocubes exhibited shortened ion transport paths and excellent reaction kinetics due to their well-designed structures and controlled compositions.The electrochemical test results show that an excellent specific capacity of 672.2 mA·h/g after 500 cycles at a current density of 1 A/g was maintained for CoSn2/Sn@C electrode.The core−shell structure design of the elaborated CoSn2/Sn@C nanocubes holds significant implications for the development of high-performance anode materials for LIBs. 展开更多
关键词 lithium-ion batteries anode materials core−shell structure nanocube CoSn2/Sn@C composite electrochemical properties
暂未订购 下载PDF
Colloidal synthesis of lead chalcogenide/lead chalcohalide core/shell nanostructures and structural evolution 认领 引用 被引量：2
9
作者 Yang Liu Kunyuan Lu +11 位作者 Yujie Zhu Xudong Hu Yusheng Li Guozheng Shi Xingyu Zhou Lin Yuan Xiang Sun Xiaobo Ding Irfan Ullah Muhammad Qing Shen Zeke Liu Wanli Ma 《Journal of Semiconductors》 EI CAS CSCD 2025年第4期38-44,共7页
Lead chalcohalides(PbYX,X=Cl,Br,I;Y=S,Se)is an extension of the classic Pb chalcogenides(PbY).Constructing the heterogeneous integration with PbYX and PbY material systems makes it possible to achieve significantly im... Lead chalcohalides(PbYX,X=Cl,Br,I;Y=S,Se)is an extension of the classic Pb chalcogenides(PbY).Constructing the heterogeneous integration with PbYX and PbY material systems makes it possible to achieve significantly improved optoelectronic performance.In this work,we studied the effect of introducing halogen precursors on the structure of classical PbS nanocrystals(NCs)during the synthesis process and realized the preparation of PbS/Pb3S2X2 core/shell structure for the first time.The core/shell structure can effectively improve their optical properties.Furthermore,our approach enables the synthesis of Pb3S2Br2 that had not yet been reported.Our results not only provide valuable insights into the heterogeneous integration of PbYX and PbY materials to elevate material properties but also provide an effective method for further expanding the preparation of PbYX material systems. 展开更多
关键词 lead chalcohalides lead chalcogenides PbS nanocrystal core/shell structure Pb3S2X2nanocrystal
暂未订购 下载PDF
Energy‑Based Physics‑Informed Neural Network for Linear Elastic Analysis of Multi‑patch Plate and Shell Structures 认领 引用
10
作者 GUO Boyu CHEN Yuhang +2 位作者 QIU Hao XU Xianhua GUO Yujie 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2026年第3期463-474,共12页
Machine learning provides a fast and accurate tool for the prediction of a physical model.In this paper,a machine learning framework based on the physics-informed neural network(PINN)was established to predict the lin... Machine learning provides a fast and accurate tool for the prediction of a physical model.In this paper,a machine learning framework based on the physics-informed neural network(PINN)was established to predict the linear elastic static deformation of plate and shell structures.In contrast to the purely data-driven neural network,PINN incorporates the physical laws into the training process,thus reducing the required amount of data.The loss functions of the PINN are constructed based on the total potential energy functions of the thin-walled structure.Besides,the proposed PINN can be easily extended to shell structures with multiple patches by adding interface compatibility constraints into the loss function.The performance of the PINNs with the energy-based loss functions was evaluated with different shell structures and compared with the finite element results.Numerical examples show that the highly accurate results can be achieved based on the proposed framework which significantly reduces the amount of required training data compared to the data-driven neural network. 展开更多
关键词 physics-informed neural network(PINN) machine learning plate and shell structures total potential energy partial differential equations
暂未订购 下载PDF
Synergistic enhancement of strength and plasticity in CoCrFeNiMn high-entropy alloys by novel core−shell microstructure design 认领 引用 被引量：1
11
作者 Chong-yang LIU Xiao-song JIANG +2 位作者 Hong-liang SUN Zi-xuan WU Liu YANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第10期3428-3442,共15页
The novel core−shell SiC@CoCrFeNiMn high-entropy alloy(HEA)matrix composites(SiC@HEA)were successfully prepared via mechanical ball milling and vacuum hot-pressing sintering(VHPS).After sintering,the microstructure wa... The novel core−shell SiC@CoCrFeNiMn high-entropy alloy(HEA)matrix composites(SiC@HEA)were successfully prepared via mechanical ball milling and vacuum hot-pressing sintering(VHPS).After sintering,the microstructure was composed of FCC solid solution,Cr23C6 carbide phases,and Mn2SiO4 oxy-silicon phase.The relative density,hardness,tensile strength,and elongation of SiC@HEA composites with 1.0 wt.%SiC were 98.5%,HV 358.0,712.3 MPa,and 36.2%,respectively.The core−shell structure had a significant deflecting effect on the cracks.This effect allowed the composites to effectively maintain the excellent plasticity of the matrix.As a result,the core−shell SiC@HEA composites obtained superior strength and plasticity with multiple mechanisms. 展开更多
关键词 high-entropy alloy SiC nanoparticles microstructure design core−shell structure tensile properties strength and plasticity synergy
暂未订购 下载PDF
Micro-network strengthened Ti6Al4V composites synthesized using core-shell structured composite powders for achieving superior strength and ductility 认领 引用 被引量：1
12
作者 Wei Shang Guo-Peng Wang +7 位作者 Jun-Jie Xu Xiang Li Xue-Zhe Zhang Yong-Qing Fu Ahmed Elmarakbi Shan-Na Xu Yu-Sheng Zhang Long-Long Dong 《Rare Metals》 SCIE EI CAS CSCD 2025年第5期3582-3590,共9页
Synergistically and simultaneously enhancing strength and ductility has been a major challenge for the development and applications of titanium matrix composites.Herein,a new design methodology for Ti2Cu/Ti6Al4V... Synergistically and simultaneously enhancing strength and ductility has been a major challenge for the development and applications of titanium matrix composites.Herein,a new design methodology for Ti2Cu/Ti6Al4V composites with superior strength and ductility is reported. 展开更多
关键词 titanium matrix compositeshereina design methodology ductility strength enhancing strength ductility micro network Ti Al V core shell
暂未订购 下载PDF
Boosting interfacial charge-transfer kinetics via core-shell MOF heterostructures with shared metal nodes 认领 引用
13
作者 Weilai Yu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2025年第6期8-11,共4页
Artificial photosynthesis presents a sustainable and cost-effective approach to harnessing solar energy to produce value-added chemicals[1,2].In particular,the simultaneous photocatalytic conversion of CO2and H2... Artificial photosynthesis presents a sustainable and cost-effective approach to harnessing solar energy to produce value-added chemicals[1,2].In particular,the simultaneous photocatalytic conversion of CO2and H2O into formic acid(HCOOH)and hydrogen peroxide(H2O2)has emerged as a promising strategy to mitigate global warming driven by CO2emissions.HCOOH is a versatile chemical and hydrogen carrier,offering economic and practical advantages due to its compatibility with existing industrial processes and energy storage/conversion systems.Meanwhile,H2O2is among the world’s top 100 essential chemicals,with a global market valued at$4.0 billion in 2020 and projected to grow to$5.2 billion by 2026. 展开更多
关键词 interfacial charge transfer artificial photosynthesis mitigate global warming core shell formic acid hcooh photocatalytic conversion chemical hydrogen carrieroffering hydrogen peroxide h o
暂未订购 下载PDF
Correction:Confining Li+Solvation in Core-Shell Metal-Organic Frameworks for Stable Lithium Metal Batteries at 100℃ 认领 引用
14
作者 Minh Hai Nguyen Jeongmin Shin +3 位作者 Mee‑Ree Kim Quan Van Nguyen Jin-Hyeok Cha Sangbaek Park 《Nano-Micro Letters》 SCIE EI CAS CSCD 2026年第8期659-662,共4页
Correction to:Nano-Micro Lett.(2026)18:135 http://gffzzd3cc09b8251d45dfs6c6uk0u5qufx6wfv.ffgz.tsg.suse.edu.cn/10.1007/s40820-025-01988-7 Following publication of the original article[1],the authors noticed that Fig.2 was published with an incorrect panel order,which d... Correction to:Nano-Micro Lett.(2026)18:135 http://gffzzd3cc09b8251d45dfs6c6uk0u5qufx6wfv.ffgz.tsg.suse.edu.cn/10.1007/s40820-025-01988-7 Following publication of the original article[1],the authors noticed that Fig.2 was published with an incorrect panel order,which does not reflect the final intended version approved during the proof stage.As a result,the panel sequence in Fig.2 is inconsistent with the figure caption and manuscript text.This issue is limited strictly to the order and labeling of the figure panels.The experimental data,scientific interpretation,results,and conclusions of the paper remain completely unchanged. 展开更多
关键词 temperature lithium metal batteries solvation metal organic frameworks core shell structures stability
暂未订购 下载PDF
CoSe2@MoS2core-shell nanocubes as highly efficient electrocatalysts for acidic and alkaline hydrogen evolution 认领 引用
15
作者 Jun-Hui Cao Guang-Long Wang +6 位作者 Shu-Sen Hou Hu Zhou Chun Ouyang Long-Feng Lin Yan-Xin Qiao Yi-Shan Jiang Qi-Chao Zhang 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第6期56-67,共12页
CoCo-Prussian blue analogue nanocubes were firstly synthesized via a co-precipitation method and subsequently converted into CoSe2nanocubes through a high-temperature selenization.The core-shell-structured CoSe2... CoCo-Prussian blue analogue nanocubes were firstly synthesized via a co-precipitation method and subsequently converted into CoSe2nanocubes through a high-temperature selenization.The core-shell-structured CoSe2@MoS2electrocatalyst was then fabricated via a hydrothermal process.The resulting material exhibits outstanding hydrogen evolution reaction performances in both acidic and alkaline electrolytes,achieving overpotentials of 229 and 247 mV at the current density of 10 mA cm-2,respectively,with the corresponding Tafel slopes of 79 and 115 mV dec-1.Notably,the CoSe2@MoS2catalyst maintains a high catalytic activity after extended cycles.The enhanced catalytic activity and durability are primarily ascribed to the core-shell architecture,wherein MoS2nanosheets uniformly anchored on the surface of CoSe2nanocubes effectively suppress the self-agglomeration of MoS2nanosheets,thus providing abundant active sites. 展开更多
关键词 Electrocatalyst Hydrogen evolution CoSe2 MoS2 Core−shell structure
暂未订购 下载PDF
Analysis of the electromechanical coupling characteristics of piezoelectric semiconductor PN junction shell structures 认领 引用 被引量：3
16
作者 Tiqing WANG Feng ZHU +4 位作者 Peng LI Zelin XU Tingfeng MA I.KUZNETSOVA Zhenghua QIAN 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2025年第6期1167-1186,共20页
Based on the nonlinear drift-diffusion(NLDD)model,the coupled behavior between the mechanical and electrical fields in piezoelectric semiconductor(PS)PN junctions under two typical loading conditions is investigated.T... Based on the nonlinear drift-diffusion(NLDD)model,the coupled behavior between the mechanical and electrical fields in piezoelectric semiconductor(PS)PN junctions under two typical loading conditions is investigated.The governing equations for the general shell structure of the PS PN junction are derived within the framework of virtual work principles and charge continuity conditions.The distributions of the electromechanical coupling field are obtained by the Fourier series expansion and the differential quadrature method(DQM),and the nonlinearity is addressed with the iterative method.Several numerical examples are presented to investigate the effects of mechanical loading on the charge carrier transport characteristics.It is found that the barrier height of the heterojunction can be effectively modulated by mechanical loading.Furthermore,a nonlinearity index is introduced to quantify the influence of nonlinearity in the model.It is noted that,when the concentration difference between the two sides is considerable,the nonlinear results differ significantly from the linear results,thereby necessitating the adoption of the NLDD model. 展开更多
关键词 piezoelectric semiconductor(PS) PN junction shell structures nonlinear drift-diffusion(NLDD)model potential barrier(well)
暂未订购 下载PDF
Preparation and upconversion luminescence properties of LaF_3:Yb^(3 +),Er^(3 +) /SiO_2 nanocomposites with core /shell structure 认领 引用
17
作者 曲玉秋 李美成 赵连城 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2012年第3期73-76,共4页
LaF^3＋ Yb^3＋ , Er^3＋ nanoparticles were successfully synthesized using solvothermal treatment, and LaF^3＋ Yb^3＋ , Er^3＋/SiO2 core/shell nanoparticles were also prepared with reverse microemulsion technique. The ... LaF^3＋ Yb^3＋ , Er^3＋ nanoparticles were successfully synthesized using solvothermal treatment, and LaF^3＋ Yb^3＋ , Er^3＋/SiO2 core/shell nanoparticles were also prepared with reverse microemulsion technique. The crystal structure, morphology and photoluminescence properties of as-prepared core/shell nanoparticles were in- vestigated by X-ray diffraction, transmission electron microscopy and fluorescence spectrophotometer. The re- sults showed thatLaF^3＋ Yb^3＋ , Er^3＋ nanoparticles are of hexagonal structure and SiO2 shell is amorphous. The size ofLaF^3＋ Yb^3＋ , Er^3＋. nanoparticles is 13 nm and the LaF^3＋ Yb^3＋ , Er^3＋/SiO2 nanoparticles present clearly a core/shell structure with 12 nm shell thickness. The solubility of LaF^3＋ Yb^3＋ , Er^3＋ nanocrystals in water and the biocompatibility are both improved by the SiO2 shell. The upconversion luminescence spectra suggested that the SiO~ shell has small effect on the upconversion luminescence properties of the LaF^3＋ Yb^3＋ , Er^3＋ nanocrys- tals. The core/shell structure LaF^3＋ Yb^3＋ , Er^3＋ /SiO2. nanopartlcles are expected to be used in biological appli- cations. 展开更多
关键词 LaFz ： Yb3 ＋ , Er3 ＋/SiO2 nanocomposites core/shell structure upconversion luminescence
暂未订购 下载PDF
Preparation of a p-n heterojunction BiFeO_3@TiO_2 photocatalyst with a core–shell structure for visible-light photocatalytic degradation 认领 引用 被引量：16
18
作者 Yazi Liu Shanshan Ding +5 位作者 Jian Xu Huayang Zhang Shaogui Yang Xiaoguang Duan Hongqi Sun Shaobin Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第6期1052-1062,共11页
Magnetically separable bismuth ferrite(BiFeO3)nanoparticles were fabricated by a citrate self‐combustion method and coated with titanium dioxide(TiO2)by hydrolysis of titanium butoxide(Ti(OBu)4)to form BiFeO3@TiO2cor... Magnetically separable bismuth ferrite(BiFeO3)nanoparticles were fabricated by a citrate self‐combustion method and coated with titanium dioxide(TiO2)by hydrolysis of titanium butoxide(Ti(OBu)4)to form BiFeO3@TiO2core-shell nanocomposites with different mass ratios of TiO2to BiFeO3.The photocatalytic performance of the catalysts was comprehensively investigated via photocatalytic oxidation of methyl violet(MV)under both ultraviolet and visible‐light irradiation.The BiFeO3@TiO2samples exhibited better photocatalytic performance than either BiFeO3or TiO2alone,and a BiFeO3@TiO2sample with a mass ratio of1:1and TiO2shell thickness of50-100nm showed the highest photo‐oxidation activity of the catalysts.The enhanced photocatalytic activity was ascribed to the formation of a p‐n junction of BiFeO3and TiO2with high charge separation efficiency as well as strong light absorption ability.Photoelectrochemical Mott-Schottky(MS)measurements revealed that both the charge carrier transportation and donor density of BiFeO3were markedly enhanced after introduction of TiO2.The mechanism of MV degradation is mainly attributed to hydroxyl radicals and photogenerated electrons based on energy band theory and the formation of an internal electrostatic field.In addition,the unique core-shell structure of BiFeO3@TiO2also promotes charge transfer at the BiFeO3/TiO2interface by increasing the contact area between BiFeO3and TiO2.Finally,the photocatalytic activity of BiFeO3@TiO2was further confirmed by degradation of other industrial dyes under visible‐light irradiation. 展开更多
关键词 Bismuth ferrite Titanium dioxide Core–shell structure Degradation Photocatalysis Visible light
暂未订购 下载PDF
Enhancing electromagnetic wave absorption with core‐shell structured SiO2@MXene@MoS2 nanospheres 认领 引用 被引量：18
19
作者 Xuewen Jiang Qian Wang +7 位作者 Limeng Song Hongxia Lu Hongliang Xu Gang Shao Hailong Wang Rui Zhang Changan Wang Bingbing Fan 《Carbon Energy》 SCIE EI CAS CSCD 2024年第8期90-104,共15页
Material composition and structural design are important factors influencing the electromagnetic wave(EMW)absorption performance of materials.To alleviate the impedance mismatch attributed to the high dielectric const... Material composition and structural design are important factors influencing the electromagnetic wave(EMW)absorption performance of materials.To alleviate the impedance mismatch attributed to the high dielectric constant of Ti3C2TxMXene,we have successfully synthesized core‐shell structured SiO2@MXene@MoS2nanospheres.This architecture,comprising SiO2 as the core,MXene as the intermediate layer,and MoS2 as the outer shell,is achieved through an electrostatic self‐assembly method combined with a hydrothermal process.This complex core‐shell structure not only provides a variety of loss mechanisms that effectively dissipate electromagnetic energy but also prevents self‐aggregation of MXene and MoS2 nanosheets.Notably,the synergistic combination of SiO2 and MoS2 with highly conductive MXene enables the suitable dielectric constant of the composites,ensuring optimal impedance matching.Therefore,the core‐shell structured SiO2@MXene@MoS2 nanospheres exhibit excellent EMW absorption performance,featuring a remarkable minimum reflection loss(RLmin)of−52.11 dB(2.4 mm).It is noteworthy that these nanospheres achieve an ultra‐wide effective absorption bandwidth(EAB)of 6.72 GHz.This work provides a novel approach for designing and synthesizing high‐performance EMW absorbers characterized by“wide bandwidth and strong reflection loss.” 展开更多
关键词 core‐shell structure electromagnetic wave absorption multiloss mechanism SiO2@MXene@MoS2
暂未订购 下载PDF
Hierarchical Carbon Microtube@Nanotube Core-Shell Structure for High-Performance Oxygen Electrocatalysis and Zn-Air Battery 认领 引用 被引量：10
20
作者 Wenfu Xie Jianming Li +3 位作者 Yuke Song Shijin Li Jianbo Li Mingfei Shao 《Nano-Micro Letters》 SCIE EI CAS CSCD 2020年第8期46-59,共14页
Zinc-air batteries(ZABs)hold tremendous promise for clean and efficient energy storage with the merits of high theoretical energy density and environmental friendliness.However,the performance of practical ZABs is sti... Zinc-air batteries(ZABs)hold tremendous promise for clean and efficient energy storage with the merits of high theoretical energy density and environmental friendliness.However,the performance of practical ZABs is still unsatisfactory because of the inevitably decreased activity of electrocatalysts when assembly into a thick electrode with high mass loading.Herein,we report a hierarchical electrocatalyst based on carbon microtube@nanotube core-shell nanostructure(CMT@CNT),which demonstrates superior electrocatalytic activity for oxygen reduction reaction and oxygen evolution reaction with a small potential gap of 0.678 V.Remarkably,when being employed as air-cathode in ZAB,the CMT@CNT presents an excellent performance with a high power density(160.6 mW cm^−2),specific capacity(781.7 mAhgZn^−1)as well as long cycle stability(117 h,351 cycles).Moreover,the ZAB performance of CMT@CNT is maintained well even under high mass loading(3 mg cm−2,three times as much as traditional usage),which could afford high power density and energy density for advanced electronic equipment.We believe that this work is promising for the rational design of hierarchical structured electrocatalysts for advanced metal-air batteries. 展开更多
关键词 Hierarchical structure Carbon microtube@nanotube Core–shell Zinc–air battery
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 250 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈