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Superconductivity in potassium and ammonia co-intercalated FeSe1-xTex
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作者 BinBin Xiao NaiZhou Wang +4 位作者 Chao Shang FanBao Meng JianWen Ding Bin Lei XiGang Luo 《中国科学:物理学、力学、天文学英文版》 SCIE EI CAS CSCD 2019年第4期84-90,共7页
The origin of the ~40 and ~30 K superconducting phases in the metal-intercalated FeSe superconductors is still unclear. We report the synthesis of K0.3(NH3)y(FeSe1-xTex)2 and K0.6(NH3)y(FeSe1-xTex)2 with x=0-0.6 by us... The origin of the ~40 and ~30 K superconducting phases in the metal-intercalated FeSe superconductors is still unclear. We report the synthesis of K0.3(NH3)y(FeSe1-xTex)2 and K0.6(NH3)y(FeSe1-xTex)2 with x=0-0.6 by using the liquid ammonia method at room temperature. The superconducting transition temperature Tcof the former remains about 43 K for all the nominal Te content less than 0.3, while that of the latter is about 30 K and obviously decreases with Te doping. Superconductivity disappears for x ≥0.4 in both systems. Except for the different chemical pressure induced by substitution of Te for Se in both systems, we also observed distinct external pressure effect on superconductivity for both systems, with much more efficiency of suppressing Tcby external pressure in the former system. These dramatic differences of both chemical and external pressure effects on Tc between the ~30 and ~40 K superconducting phases revealed that the existence of the two superconducting phases can be ascribed to the moderate and negligible coupling between FeSe layers, respectively. 展开更多
关键词 PNICTIDES and CHALCOGENIDES properties of SUPERCONDUCTORS effects of pressure methods of MATERIALS synthesis and MATERIALS processing
Optomechanical control of stacking patterns of h-BN bilayer
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作者 Haowei Xu Jian Zhou +2 位作者 Yifei Li Rafael Jaramillo Ju Li 《纳米研究:英文版》 SCIE EI CAS CSCD 2019年第10期2634-2639,共6页
Few-layer two-dime nsion al(2D)materials usually have differe nt(meta)-stable stacking patterns,which have distinet electronic and optical properties.In spired by optical tweezers,we show that a laser with selected fr... Few-layer two-dime nsion al(2D)materials usually have differe nt(meta)-stable stacking patterns,which have distinet electronic and optical properties.In spired by optical tweezers,we show that a laser with selected freque ncy can modify the gen eralized stacking-fault en ergy Iandscape of bilayer hexagonal boron nitride(BBN),by coupling to the slip-dependent dielectric response.Consequently,BBN can be reversibly and barrier-freely switched betwee n its stacking patter ns in a controllable way.We simulate the dyn amics of the stacki ng transition with a simplified equati on of motion and dem on strate that it happe ns at picosec ond timescale.When one layer of BBN has a nearly-free surface boundary condition,BBN can be locked in its metastable stacking modes for a long time.Such a fast,reversible and non-volatile transition makes BBN a potential media for data storage and optical phase mask. 展开更多
关键词 phase change materials two-dimensional materials opto-mechanics density functional theory
Synthesis and characterization of BaTiO3/α-Fe2O3 core/shell structure
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作者 Suzana FILIPOVIC Vera P.PAVLOVIC +5 位作者 Miodrag MITRIC Steva LEVIC NebojCa MITROVIC Aleksa MARICIC Branislav VLAHOVIC Vladimir B.PAVLOVIC 《先进陶瓷(英文版)》 CSCD 2019年第1期133-147,共15页
Multiferroic materials attracted a lot of attention in recent years because of their significant scientific interest and technological applications. The multiferroic core/shell powders have a better connectivity betwe... Multiferroic materials attracted a lot of attention in recent years because of their significant scientific interest and technological applications. The multiferroic core/shell powders have a better connectivity between the phases, resulting in superior dielectric and magneto electric properties. In this study, the influence of preparation condition on structure and properties of BaTiO3/α-Fe2 O3 core/shell composite materials was examined. The five samples were obtained by varying synthesis conditions, such as synthesized method(co-precipitation and sonochemical method) and pH values of solution. XRD and Raman spectroscopy analyses were performed in order to determine phase composition and structural changes within samples. Morphology modifications were examined by SEM and EDS analyses. Finally, effect of structural and microstructural changes on magnetic and electrical properties was detected and explained. 展开更多
关键词 ceramics electronic MATERIALS magnetic MATERIALS RAMAN spectroscopy X-ray diffraction(XRD) FERROELECTRICITY
基于光子晶体的红外隐身材料研究进展
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作者 卢仪 卜小海 +2 位作者 李栋先 刘飞佑 张泽武 《激光与光电子学进展》 CSCD 北大核心 2019年第8期24-33,共10页
光子晶体是由多种具有不同介电常数的介质材料在空间按一定的周期排列所形成的一种人造结构晶体,其光子禁带对入射电磁波具有高反射率,能够有效改变目标的辐射特性。基于光子晶体的红外隐身材料的研究是当前红外隐身技术的研究热点之一... 光子晶体是由多种具有不同介电常数的介质材料在空间按一定的周期排列所形成的一种人造结构晶体,其光子禁带对入射电磁波具有高反射率,能够有效改变目标的辐射特性。基于光子晶体的红外隐身材料的研究是当前红外隐身技术的研究热点之一。对光子晶体的结构及特性等方面进行了详细介绍,系统综述了光子晶体材料在红外隐身方面的应用现状,并对新型红外光子晶体材料的研究进行了展望,以期为光子晶体红外隐身材料在宽频隐身、多波段兼容、带隙可调等领域的需求提供一定的解决思路。 展开更多
关键词 材料 隐身材料 光子晶体 光子带隙 红外发射率
Research progress in lead-less or lead-free three-dimensional perovskite absorber materials for solar cells 预览
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作者 Huan-yu Zhang Rui Li +2 位作者 Wen-wu Liu Mei Zhang Min Guo 《矿物冶金与材料学报:英文版》 SCIE EI CAS CSCD 2019年第4期387-403,共17页
The trend toward lead-free or lead-less perovskite solar cells(PSCs)has attracted increasing attention over the past few years because the toxicity of lead(Pb)is one of the substantial restrictions for large-scale app... The trend toward lead-free or lead-less perovskite solar cells(PSCs)has attracted increasing attention over the past few years because the toxicity of lead(Pb)is one of the substantial restrictions for large-scale applications.Researchers have investigated the viability of substituting Pb with other elements(group 14 elements,group 2 elements,transition-metal elements,and group 13 and 15 elements)in the three-dimensional(3D)perovskites by theoretical calculations and experimental explorations.In this paper,recent research progress in Pb-less and Pb-free PSCs on the perovskite compositions,deposition methods,and device structures are summarized and the main problems that hinder the enhancement of device efficiency and stability are discussed in detail.To date,the fully Sn-based PSCs have shown a power conversion efficiency(PCE)of 8.12%and poor device stability.However,lead-less PSCs have shown higher PCE and a better stability.In addition,the introduction of double-perovskite materials also draws researchers’attention.We believe that the engineering of elemental composition,perovskite deposition methods,and interfacial modification are critical for the future development of Pb-less and Pb-free PSCs. 展开更多
关键词 PEROVSKITE solar cells LEAD-FREE PEROVSKITE MATERIALS lead-less PEROVSKITE MATERIALS composition engineering stability
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Perspectives on exfoliated two-dimensional spintronics 预览
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作者 Xiaoxi Li Baojuan Dong +4 位作者 Xingdan Sun Hanwen Wang Teng Yang Guoqiang Yu Zheng Vitto Han 《半导体学报:英文版》 EI CAS CSCD 2019年第8期81-91,共11页
Magnetic orderings, i.e., the spontaneous alignment of electron spins below a critical temperature, have been playing key roles in modern science and technologies for both the wide applications of magnetic recording f... Magnetic orderings, i.e., the spontaneous alignment of electron spins below a critical temperature, have been playing key roles in modern science and technologies for both the wide applications of magnetic recording for information storage and the vibrant potential of solid state electronic spin devices (also known as spintronics) for logic operations. In the past decades, thanks to the development of thin film technologies, magnetic thin films via sputtering or epitaxial growth have made the spintronic devices possible at the industrial scale. Yet thinner materials at lower costs with more versatile functionalities are highly desirable for advancing future spintronics. Recently, van der Waals magnetic materials, a family of magnets that can in principle be exfoliated down to the monolayer limit, seem to have brought tremendous opportunities: new generation van der Waals spintronic devices can be seamlessly assembled with possible applications such as optoelectronics, flexible electronics, and etc. Moreover, those exfoliated spintronic devices can potentially be compatible with the famed metal-oxide field effect transistor architectures, allowing the harness of spin performances through the knob of an electrostatic field. 展开更多
关键词 VAN der WAALS magnetic MATERIALS SPINTRONICS two dimensional MATERIALS
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Salt-assisted chemical vapor deposition of two-dimensional materials
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作者 Wei Han Kailang Liu +5 位作者 Sanjun Yang Fakun Wang Jianwei Su Bao Jin Huiqiao Li Tianyou Zhai 《中国科学:化学英文版》 SCIE EI CAS CSCD 2019年第10期1300-1311,共12页
Two-dimensional(2D) materials with atomic thickness are promising candidates for the applications in future semiconductor devices, owing to their fascinating physical properties and superlative optoelectronic performa... Two-dimensional(2D) materials with atomic thickness are promising candidates for the applications in future semiconductor devices, owing to their fascinating physical properties and superlative optoelectronic performance. Chemical vapor deposition(CVD) is considered to be an efficient method for large-scale preparation of 2D materials toward practical applications.However, the high melting points of metal precursors and the thermodynamics instabilities of metastable phases limit the direct CVD synthesis of plenty of 2D materials. The salt has recently been introduced into the CVD process, which proved to be effective to address these issues. In this review, we highlighted the latest progress in the salt-assisted CVD growth of 2D materials, including layered and non-layered crystals. Firstly, strategies of adding salts are summarized. Then, the salt-assisted growth of various layered materials is presented, emphasizing on the transition metal chalcogenides of stable and metastable phases. Furthermore, strategies to grow ultrathin non-layered materials are discussed. We provide viewpoints into the techniques of using salt, the effects of salt, and the growth mechanisms of 2D crystals. Finally, we offer the challenges to be overcome and further research directions of this emerging salt-assisted CVD technique. 展开更多
关键词 salt-assisted chemical vapor deposition 2D materials transition metal dichalcogenides non-layered materials
High-throughput experiments facilitate materials innovation:A review
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作者 LIU YiHao HU ZiHeng +5 位作者 SUO ZhiGuang HU LianZhe FENG LingYan GONG XiuQing LIU Yi ZHANG JinCang 《中国科学:技术科学英文版》 SCIE EI CAS CSCD 2019年第4期521-545,共25页
Since the Material Genome Initiative(MGI)was proposed,high-throughput based technology has been widely employed in various fields of materials science.As a theoretical guide,material informatics has been introduced ba... Since the Material Genome Initiative(MGI)was proposed,high-throughput based technology has been widely employed in various fields of materials science.As a theoretical guide,material informatics has been introduced based on machine learning and data mining and high-throughput computation has been employed for large scale search,narrowing down the scope of the experiment trials.High-throughput materials experiments including synthesis,processing,and characterization technologies have become valuable research tools to pin down the prediction experimentally,enabling the discovery-to-deployment of advances materials more efficiently at a fraction of cost.This review aims to summarize the recent advances of high-throughput materials experiments and introduce briefly the development of materials design based on material genome concept.By selecting representative and classic works in the past years,various high-throughput preparation methods are introduced for different types of material gradient libraries,including metallic,inorganic materials,and polymers.Furthermore,high-throughput characterization approaches are comprehensively discussed,including both their advantages and limitations.Specifically,we focus on high-throughput mass spectrometry to analyze its current status and challenges in the application of catalysts screening. 展开更多
关键词 MATERIAL GENOME Initiative(MGI) HIGH-THROUGHPUT MATERIAL development MATERIALS synthesis MATERIALS characterization
V2O5·nH2O nanosheets and multi-walled carbon nanotube composite as a negative electrode for sodium-ion batteries 预览
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作者 Ahmed S. Etman Junliang Sun Reza Younesi 《能源化学:英文版》 SCIE EI CAS CSCD 2019年第3期145-151,共7页
Two dimensional (2D) transition metal oxides and chalcogenides demonstrate a promising performance in sodium-ion batteries (SIBs) application. In this study, we investigated the use of a composite of freeze dried V2O5... Two dimensional (2D) transition metal oxides and chalcogenides demonstrate a promising performance in sodium-ion batteries (SIBs) application. In this study, we investigated the use of a composite of freeze dried V2O5·nH2O nanosheets and multi-walled carbon nanotube (MWCNT) as a negative electrode mate-rial for SIBs. Cyclic voltammetry (CV) results indicated that a reversible sodium-ion insertion/deinsertion into the composite electrode can be obtained in the potential window of 0.1–2.5 V vs. Na+/Na. The com-posite electrodes delivered sodium storage capacities of 140 and 45 mAh g^-1 under applied current den-sities of 20 and 100 mA g^-1, respectively. The pause test during constant current measurement showed a raise in the open circuit potential (OCP) of about 0.46 V, and a charge capacity loss of ~10%. These val-ues are comparable with those reported for hard carbon electrodes. For comparison, electrodes of freeze dried V2O5·nH2O nanosheets were prepared and tested for SIBs application. The results showed that the MWCNT plays a significant role in the electrochemical performance of the composite material. 展开更多
关键词 Sodium-ion batteries ANODE MATERIALS VANADIUM pentoxide NANOSHEETS Composite MATERIALS
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MATERIALS AND METHODS 预览
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《水稻科学:英文版》 CSCD 2019年第3期I0006-I0007,共2页
Rice germplasm A total of 208 indica P/TGMS lines were selected for analysis from the National Mid-term Genebank for Rice, Hangzhou, China (Supplemental Table 2), and 100 typical indica and 100 japonica accessions to ... Rice germplasm A total of 208 indica P/TGMS lines were selected for analysis from the National Mid-term Genebank for Rice, Hangzhou, China (Supplemental Table 2), and 100 typical indica and 100 japonica accessions to identify the indica/japonica component of them were also from the National Mid-term Genebank for Rice, Hangzhou, China (Supplemental Table 5). 展开更多
关键词 MATERIALS METHODS RICE
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An electrodeposition approach to metal/metal oxide heterostructures for active hydrogen evolution catalysts in near-neutral electrolytes
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作者 Michael J.Kenney Jianan Erick Huang +9 位作者 Yong Zhu Yongtao Meng Mingquan Xu Guanzhou Zhu Wei-Hsuan Hung Yun Kuang Mengchang Lin Xiaoming Sun Wu Zhou Hongjie Dai 《纳米研究:英文版》 SCIE EI CAS CSCD 2019年第6期1431-1435,共5页
Neutral water splitting is attractive for its use of non-corrosive and environmentally friendly electrolytes.However,catalyst development for hydrogen and oxygen evolution remains a challenge under neutral conditions.... Neutral water splitting is attractive for its use of non-corrosive and environmentally friendly electrolytes.However,catalyst development for hydrogen and oxygen evolution remains a challenge under neutral conditions.Here we report a simple electrodeposition and reductive annealing procedure to produce a highly active Ni-Co-Cr metal/metal oxide heterostructured catalyst directly on Ni foam.The resulting electrocatalyst for hydrogen evolution reaction (HER) requires only 198 mV of overpotential to reach 100 mNcm2 in 1 M potassium phosphate (pH =7.4) and can operate for at least two days without significant performance decay.Scanning transmission electron microscopy coupled with electron energy loss spectroscopy (STEM-EELS) imaging reveals a Ni-Co alloy core decorated with blended oxides layers of NiO,CoO and Cr2O3.The metal/metal oxide interfaces are suggested to be responsible for the high HER activity. 展开更多
关键词 water SPLITTING CATALYSIS NANOSTRUCTURED materials hydrogen EVOLUTION chemical mapping
A shortcut to marking 3D target curves on curved surface via a galvanometric laser scanner
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作者 Junchao TU Mingang WANG Liyan ZHANG 《中国航空学报:英文版》 SCIE EI CAS CSCD 2019年第6期1555-1563,共9页
Marking arbitrary three-dimensional(3D) target curves on given objects with curved surface is required in many industrial fields, such as fabric prepreg placement in composite material part fabrication, product assemb... Marking arbitrary three-dimensional(3D) target curves on given objects with curved surface is required in many industrial fields, such as fabric prepreg placement in composite material part fabrication, product assembly, surface painting for decoration, etc. A shortcut to the solution of this intractable problem is proposed by utilizing a galvanometric laser scanner(GLS) with the aid of a camera. Without using the existing tedious GLS calibration procedures,the proposed method directly establishes a mapping between the 3D coordinates of the laser spots on the object surface and the control voltages of the scanner. A single-hidden layer feedforward neural network(SLFN) is employed to model the mapping. By projecting a dense grid of laser spots on the object to be marked and simultaneously taking only one image, the SLFN model is trained in minutes via a linear solving mechanism. Experiments demonstrate that the trained SLFN model has a good generalization performance for marking 3D target curves. The 3D laser marking errors on experimental objects are less than 0.5 mm. The proposed method is especially suitable for on-site use and can be conveniently extended to multiple GLSs for marking large complex objects. 展开更多
关键词 Calibration FABRIC PREPREG PLACEMENT LASER materials processing LASER SCANNER Three-dimensional LASER MARKING
高表面粗糙度银纳米线的分形研究和SERS效应
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作者 江恒泽 徐大鹏 +2 位作者 康维刚 张一帆 陈建 《光学学报》 EI CAS CSCD 北大核心 2019年第7期274-280,共7页
为了获得分布均匀、有序排列、可重复性高的表面增强拉曼散射基底(SERS),选取银离子导体RbAg4I5薄膜,结合真空热蒸镀工艺和固态离子学方法在外加电流作用下制备出高表面粗糙度的银纳米线。同时,选取罗丹明6G(R6G)溶液作为探针分子,研究... 为了获得分布均匀、有序排列、可重复性高的表面增强拉曼散射基底(SERS),选取银离子导体RbAg4I5薄膜,结合真空热蒸镀工艺和固态离子学方法在外加电流作用下制备出高表面粗糙度的银纳米线。同时,选取罗丹明6G(R6G)溶液作为探针分子,研究高表面粗糙度银纳米线作为SERS基底时的表面增强拉曼特性。实验结果表明:制备得到的银纳米线在宏观上呈现为树枝状,在微观上呈现为有序排列,并且其纳米结构的分形维数为1.59;采用银纳米线作为SERS基底时,能够检测到R6G溶液的浓度低至10^-17 mol/L。制备的高表面粗糙度和有序密集排列的银纳米线SERS基底在环境科学等领域具有潜在的应用前景。 展开更多
关键词 材料 高表面粗糙度 固态离子学方法 SERS基底 分形结构
光热处理对Si-Na-Zn-Al系光热敏折变玻璃中银团簇析晶的影响
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作者 姚翔 郑锐林 +2 位作者 王中跃 李鹏 韦玮 《光学学报》 EI CAS CSCD 北大核心 2019年第7期281-287,共7页
选取Si-Na-Zn-Al体系作为玻璃基质,Ce4+和Ag+分别作为光敏因子和热敏因子;通过优化紫外曝光剂量与热处理条件,研究了光热敏折变玻璃中Ag0团簇的析出及其对玻璃透过率、析晶等性能的影响。结果表明:通过控制紫外曝光剂量和热处理条件可... 选取Si-Na-Zn-Al体系作为玻璃基质,Ce4+和Ag+分别作为光敏因子和热敏因子;通过优化紫外曝光剂量与热处理条件,研究了光热敏折变玻璃中Ag0团簇的析出及其对玻璃透过率、析晶等性能的影响。结果表明:通过控制紫外曝光剂量和热处理条件可以调控Ag0团簇的结构和NaF晶体的析出;当紫外曝光剂量为4 J/cm^2@315 nm、成核温度为580℃、析晶温度为650℃时,可以获得均匀的Ag0团簇及NaF晶体。 展开更多
关键词 材料 光热敏折变 曝光剂量 热处理条件 银团簇 NaF晶体
Micro/nano-scale Characterization and Fatigue Fracture Resistance of Mechanoreceptor with Crack-shaped Slit Arrays in Scorpion
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作者 Kejun Wang Junqiu Zhang +4 位作者 Yuqiang Fang Daobing Chen Linpeng Liu Zhiwu Han Luquan Ren 《仿生工程学报:英文版》 SCIE EI CSCD 2019年第3期410-422,共13页
The nocturnal scorpion Heterometrus petersii uses Basitarsal Compound Slit Sensilla (BCSS) as mechanoreceptor to detect mechanical signal (e.g. substrate vibration, cyclic loads caused by walking) without fatigue fail... The nocturnal scorpion Heterometrus petersii uses Basitarsal Compound Slit Sensilla (BCSS) as mechanoreceptor to detect mechanical signal (e.g. substrate vibration, cyclic loads caused by walking) without fatigue failure such as initiation of fatigue crack and further propagation of crack-shaped slit. The outstanding perceptive function has been discovered for over half a century. However, it is not yet clear about the microstructure, material composition and micromechanical property which are all important factors that determine the fatigue fracture resistance of the BCSS. Here, the microscopic characteristics of the BCSS were thoroughly studied. The results dicate that anti-fatigue resilin and stiff chitinous cuticle form multilayered composite as the main body of the BCSS. Meanwhile, the pre-existing slit as mechanosensory structure is covered by cuticular membrane which has different mechanical property with the epicuticle. Theoretical analysis shows that the structure-composition-property synergistic relations of composites confer on the BCSS with extreme fatigue fracture tolerance. 展开更多
关键词 slit-based mechanoreceptor materials CHARACTERIZATION MULTILAYERED composite resilin fatigue fracture RESISTANCE
A field-effect approach to directly profiling the localized states in monolayer MoS2
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作者 Hao Wu Yuan Liu +10 位作者 Zeyu Deng Hung-Chieh Cheng Dehui Li Jian Guo Qiyuan He Sen Yang Mengning Ding Yun-Chiao Huang Chen Wang Yu Huang Xiangfeng Duan 《科学通报:英文版》 SCIE EI CSCD 2019年第15期1049-1055,共7页
A fundamental understanding of the charge transport mechanism in two-dimensional semiconductors(e.g., MoS2) is crucial for fully exploring their potential in electronic and optoelectronic devices. By using monolayer g... A fundamental understanding of the charge transport mechanism in two-dimensional semiconductors(e.g., MoS2) is crucial for fully exploring their potential in electronic and optoelectronic devices. By using monolayer graphene as the barrier-free contact to MoS2, we show that the field-modulated conductivity can be used to probe the electronic structure of the localized states. A series of regularly distributed plateaus were observed in the gate-dependent transfer curves. Calculations based on the variable-range hopping theory indicate that such plateaus can be attributed to the discrete localized states near mobility edge. This method provides an effective approach to directly profiling the localized states in conduction channel with an ultrahigh resolution up to 1 meV. 展开更多
关键词 Two-dimensional LAYERED materials FIELD-EFFECT transistor LOCALIZED STATES Electronic transport Conductivity plateau
Joining Performance and Microstructure of the 2024/7075 Aluminium Alloys Welded Joints by Vaporizing Foil Actuator Welding
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作者 MENG Zhenghua WANG Xu +4 位作者 GUO Wei HU Zhili Anupam Vivek HUA Lin Glenn S DAEHN 《武汉理工大学学报:材料科学英文版》 SCIE EI CAS 2019年第2期368-372,共5页
Vaporizing foil actuator welding(VFAW) was used for joining 2024-T3 and 7075-T6 aluminum alloy sheets, and the resulting joint microstructure was analyzed. 2024/7075 aluminum alloy pairs with suitable processing param... Vaporizing foil actuator welding(VFAW) was used for joining 2024-T3 and 7075-T6 aluminum alloy sheets, and the resulting joint microstructure was analyzed. 2024/7075 aluminum alloy pairs with suitable processing parameters can be prepared by using VFAW. Dynamic preform addresses the poor formability problem of target material and advantage of VFAW on dissimilar materials in some conditions. But with standoff sheet inserting in the flyer and target, 2024/7075 welded pairs gets the better weld strength, compared with flyer preformed method. The microstructure of the circular weld area of the welded joint showed a wave interface, in which a thin melt layer formed at the center and edge parts. The crystal grains near the bonding interface were remarkably elongated and refined. Therefore, the joining of the 2024/7075 pairs was facilitated through plastic forming and melting. 展开更多
关键词 impact WELDING dissimilar materials vaporizing FOIL ACTUATOR joining interface
Two-dimensional materials for synaptic electronics and neuromorphic systems
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作者 Shuiyuan Wang David Wei Zhang Peng Zhou 《科学通报:英文版》 SCIE EI CSCD 2019年第15期1056-1066,共11页
Synapses in biology provide a variety of functions for the neural system. Artificial synaptic electronics that mimic the biological neuron functions are basic building blocks and developing novel artificial synapses i... Synapses in biology provide a variety of functions for the neural system. Artificial synaptic electronics that mimic the biological neuron functions are basic building blocks and developing novel artificial synapses is essential for neuromorphic computation. Inspired by the unique features of biological synapses that the basic connection components of the nervous system and the parallelism, low power consumption, fault tolerance, self-learning and robustness of biological neural systems, artificial synaptic electronics and neuromorphic systems have the potential to overcome the traditional von Neumann bottleneck and create a new paradigm for dealing with complex problems such as pattern recognition, image classification, decision making and associative learning. Nowadays, two-dimensional(2 D) materials have drawn great attention in simulating synaptic dynamic plasticity and neuromorphic computing with their unique properties. Here we describe the basic concepts of bio-synaptic plasticity and learning, the 2 D materials library and its preparation. We review recent advances in synaptic electronics and artificial neuromorphic systems based on 2 D materials and provide our perspective in utilizing 2 D materials to implement synaptic electronics and neuromorphic systems in hardware. 展开更多
关键词 Artificial SYNAPTIC ELECTRONICS Neuromorphic COMPUTATION 2D MATERIALS SYNAPTIC PLASTICITY Hebbian learning
Rolling origami with smart materials
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作者 Yang Wang Xing Li +3 位作者 Borui Xu Ziao Tian Zengfeng Di Yongfeng Mei 《科学通报:英文版》 SCIE EI CSCD 2019年第15期1080-1082,共3页
Three-dimensional (3D) functional devices have become an interesting topic meeting the challenge of device miniaturization and high integration in electron devices and microelectromechanical systems. Based on this exc... Three-dimensional (3D) functional devices have become an interesting topic meeting the challenge of device miniaturization and high integration in electron devices and microelectromechanical systems. Based on this exciting situation, origami in micro/nanoscale combining art and advanced science was widely utilized to transform two-dimensional (2D) sheets into 3D microstructures for various applications, such as micro-grippers [1](Fig. 1a). 展开更多
关键词 ORIGAMI MATERIALS CHALLENGE
全电介质纳米颗粒的制造及其应用
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作者 马浩 赵元安 邵建达 《激光与光电子学进展》 CSCD 北大核心 2019年第9期33-44,共12页
论述了全电介质纳米颗粒的光学性质,介绍了全电介质纳米颗粒的制备方法,分析了各种制备方法的优缺点,回顾了全电介质纳米颗粒在高折射率纳米谐振器、光学纳米天线、超材料和超表面、非线性纳米光子学等方面的应用,给出了全电介质纳米颗... 论述了全电介质纳米颗粒的光学性质,介绍了全电介质纳米颗粒的制备方法,分析了各种制备方法的优缺点,回顾了全电介质纳米颗粒在高折射率纳米谐振器、光学纳米天线、超材料和超表面、非线性纳米光子学等方面的应用,给出了全电介质纳米颗粒的研究重点及发展方向。 展开更多
关键词 材料 全电介质纳米颗粒 电磁响应 介电常数 磁导率
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