检索结果-内蒙古大学图书馆

Resistive switching and artificial synaptic performances of memristor based on low-dimensional bismuth halide perovskites

引用

Nano Research 2023年第7期16卷 10108-10119页

作者： Feifei Luo Yanzhao Wu Junwei Tong Fubo Tian Xianmin Zhang Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Department of Physics Freie Universität Berlin14195 BerlinGermany State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China

Zero-dimensional(0D)-Cs_(3)Bi_(2)I_(9),two-dimensional(2D)-Cs_(3)Bi_(2)Br_(9),and one-dimensional(1D)-Cs3Bi2Cl9 perovskite films have been successfully grown on indium tin oxide(ITO)glass substrates,which were used to fabricate memristors with the structure of Al/Cs_(3)Bi_(2)X_(9)(X=I,Br,and Cl)/ITO *** current three types of memristors exhibited bipolar resistive switching *** the endurance and retention time tests clearly demonstrated the excellent stability of present ***,the ON/OFF ratio of the 0D-Cs_(3)Bi_(2)I_(9)device is close to 104 at the reading voltage of 0.1 V,which is nearly 100 and 1000 times larger than those of the 1D-Cs3Bi2Cl9 device and the 2D-Cs_(3)Bi_(2)Br_(9)device,*** activation energy of halide vacancies in the Cs_(3)Bi_(2)X_(9)(X=I,Br,and Cl)films was calculated using the density functional theory by considering a minimum migration path,demonstrating the dimensionality of the Cs_(3)Bi_(2)X_(9)(X=I,Br,and Cl)film affected the formation and rupture of conductive ***,the short-term plasticity and long-term plasticity of biological synapse were simulated by evaluating the conductance responses of Al/Cs_(3)Bi_(2)X_(9)(X=I,Br,and Cl)/ITO devices under various voltage pulses in *** duration time of long-term plasticity in all the present devices can last for up to 250 *** 0D-Cs_(3)Bi_(2)I_(9)device showed both the highest spikeduration-dependent plasticity and paired-pulse facilitation indexes compared to the other two ***,the 0DCs_(3)Bi_(2)I_(9)device successfully established the associative learning behavior by simulating the Pavlov’s dog experiment.

关键词： perovskite films low-dimension resistive switching artificial synapse

来源：评论

学校读者我要写书评

暂无评论

“Branched”structural transformation of the L1_(2)-Al_(3)Zr phase manipulated by Cu substitution/segregation in the Al-Cu-Zr alloy system

引用

Journal of materials science & Technology 2024年第18期185卷 186-206页

作者： Lipeng Ding Mingqi Zhao Flemming J.H.Ehlers Zhihong Jia Zezhong Zhang Yaoyao Weng Dominique Schryvers Qing Liu Hosni Idrissi Key laboratory for Light-weight Materials Nanjing Tech UniversityNanjing 211816China School of Automation Chongqing University of Posts and TelecommunicationsChongqing 400065China Department of Physics Electron Microscopy for Materials Science(EMAT)University of AntwerpGroenenborgerlaan 171B-2020Belgium Department of Materials University of OxfordOxford 1OX3PHUK School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167China Institute of Mechanics Materials and Civil EngineeringUCLouvainIMAP1348 Louvain-la-NeuveBelgium

The effect of Cu on the evolution of the Al_(3)Zr phase in an Al-Cu-Zr cast alloy during solution treatment at 500℃has been thoroughly studied by combining atomic resolution high-angle annular dark-field scanning transmission electron microscopy,energy-dispersive X-ray spectroscopy and first-principles *** heat treatment initially produces a pure L1_(2)-Al_(3)Zr microstructure,allowing for about 13%Cu to be incorporated in the *** incorporation increases the energy barrier for anti-phase boundary(APB)activation,thus stabilizing the L1_(2)*** heating leads to a Cu-induced“branched”path for the L1_(2)structural transformation,with the latter process accelerated once the first APB has been *** atoms may either(i)be repelled by the APBs,promoting the transformation to a Cu-poor D0_(23) phase,or(ii)they may segregate at one Al-Zr layer adjacent to the APB,promoting a transformation to a new thermodynamically favored phase,Al4 CuZr,formed when these segregation layers are periodically *** studies suggest that the branching of the L1_(2)transformation path is linked to the speed at which an APB is created,with Cu attraction triggered by a comparatively slow *** unexpected transformation behavior of the L1_(2)-Al_(3)Zr phase opens a new path to un-derstanding,and potentially regulating the Al_(3)Zr dispersoid evolution for high temperature applications.

关键词： Aluminum alloys Trialuminides Anti-phase boundary High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) First-principles calculations

来源：评论

学校读者我要写书评

暂无评论

A new isotropic negative thermal expansion material of CaSnF_(6)with facile and low-cost synthesis

引用

Nano Research 2023年第4期16卷 5964-5972页

作者： Qilong Gao Sen Zhang Yixin Jiao Yongqiang Qiao Andrea Sanson Qiang Sun Xinwei Shi Erjun Liang Jun Chen Key Laboratory of Materials Physics of Ministry of Education and School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China Department of Physics and Astronomy University of PadovaPadova I-35131Italy Beijing Advanced Innovation Center for Materials Genome Engineering Department of Physical ChemistryUniversity of Science and Technology BeijingBeijing 100083China

Double ReO_(3)-type fluorides have a great interest in the field of negative thermal expansion(NTE)and luminescent ***,their application is limited by the scarcity of quantity,expensive raw materials,and harsh preparation *** this work we have found a new NTE material,CaSnF_(6),by applying the concept of the average atomic *** importantly,different from the previous solid-phase sintering and direct fluorination methods,the nano CaSnF6 has been synthesized for the first time by solvothermal *** results of X-ray diffraction(XRD)and Raman spectroscopy show that a phase transition occurs from rhombohedral(R3)to cubic(Fm3m)structure at about 200 K,and a strong isotropic NTE(αv=−15.78×10^(−6)K^(−1))appears in the cubic *** dynamics calculations from first-principles illustrate that the NTE is due to the transverse vibration of fluorine atoms excited by low-frequency *** work not only broadens the NTE family of fluorides,but also provides a new facile and low-cost fabricati on method for the preparation of NTE fluorides.

关键词： negative thermal expansion double ReO_(3)-type fluorides Grüneisen parameters lattice dynamics

来源：评论

学校读者我要写书评

暂无评论

Inflammation and Microbiota Regulation Potentiate Pneumonia Therapy by Biomimetic Bacteria and Macrophage Membrane Nanosystem

引用

Research 2023年第4期2023卷 399-413页

作者： Yuan Li Xiangmei Liu Zhenduo Cui Yufeng Zheng Hui Jiang Yu Zhang Zhaoyang Li Shengli Zhu Paul K Chu Shuilin Wu School of Materials Science and Engineering Peking UniversityBeijing 100871China The Key Laboratory of Advanced Ceramics and Machining Technology by the Ministry of Education of China School of Materials Science and EngineeringTianjin UniversityTianjin 300072China Biomedical Materials Engineering Research Center Hubei Key Laboratory of Polymer MaterialsMinistry-of-Education Key Laboratory for the Green Preparation and Application of Functional MaterialsSchool of Materials Science and EngineeringHubei UniversityWuhan430062China School of Health Science and Biomedical Engineering Hebei University of TechnologyXiping Avenue 5340Beichen DistrictTianjin 300401China Department of Orthopedics Guangdong Provincial People’s HospitalGuangdong Academy of Medical SciencesGuangzhou510080China Department of Physics Department of Materials Science and Engineeringand Department of Biomedical EngineeringCity University of Hong KongKowloon 999077Hong KongChina.

While conventional nanosystems can target infected lung tissue,they cannot achieve precise cellular targeting and enhanced therapy by modulating inflammation and microbiota for effective ***,we designed a nucleus-targeted nanosystem with adenosine triphosphate(ATP)and reactive oxygen species stimuli-response to treat pneumonia coinfected with bacteria and virus that is enhanced through inflammation and microbiota *** nucleus-targeted biomimetic nanosystem was prepared through the combined bacteria-macrophage membrane and loaded hypericin and ATP-responsive dibenzyl oxalate(MMHP)*** MMHP despoiled the Mg^(2+)of intracellular cytoplasm in bacteria to achieve an effective bactericidal ***,MMHP can target the cell nucleus and inhibit the H1N1 virus duplication by inhibiting the activity of *** possessed an immunomodulatory ability to reduce the inflammatory response and activate CD8^(+)T cells for assisted infection *** the mice model,the MMHP effectively treated pneumonia coinfected with Staphylococcus aureus and H1N1 ***,MMHP mediated the composition of gut microbiota to enhance the pneumonia ***,the dual stimuli-responsive MMHP possessed promising clinical translational potential to therapy infectious pneumonia.

关键词： inflammation H1N1 lung

来源：评论

学校读者我要写书评

暂无评论

Hierarchically designed MoWSe_(2)/WO_(3)/C anode for fast and efficient Na+storage

引用

Journal of Energy Chemistry 2023年第5期80卷 291-301,I0008页

作者： Jian Wang Yachuan Shao Fei Yuan Huilan Sun Di Zhang Zhaojin Li S.Ramesh H.J.Woo Bo Wang Centre for Ionics University of Malay1 Department of PhysicsFaculty of ScienceUniversity of MalayaKuala Lumpur 50603Malaysia Hebei Key Laboratory of Flexible Functional Materials School of Materials Science and EngineeringHebei University of Science and TechnologyShjiazhuang 0500000HebeiChina

Exploring anode materials with high energy and power density is one of the critical milestones in developing sodium-ion batteries/capacitors(SIBs/SICs).Here,the Mo and W-based bimetallic organic framework(Mo-W-MOF)with core-shell structure is first formed by a facile strategy,followed by a selenization and carbonization strategy to finally prepare multileveled Mo WSe_(2)/WO_(3)/C anode materials with core-shell petal like curled nanosheet *** the petal(MoSe_(2))-core(WO_(3))structure,the formation of WSe_(2)flakes by partial selenization on the surface of WO_(3)serves as a heterogeneous connection between MoSe_(2)and WO_(3).The enlarged layer distance(0.677 nm)between MoSe_(2)and WSe_(2)can facilitate the rapid transfer of Na+and *** density functional theory(DFT)calculations verify that the Mo WSe_(2)/WO_(3)/C heterostructure performs excellent metallic ***-situ X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),and transmission electron microscopy(TEM)confirm the activation process from the initial insertion reaction to the later conversion ***,when employed as the anode of SIBs,a remarkable capacity of 384.3 mA h g-1after 950 cycles at 10 A g^(-1)is ***,the SICs assembled with commercial activated carbon(AC)as the cathode exhibits a remarkable energy density of 81.86 W h kg^(-1)(at 190 W kg^(-1))and 72.83 W h kg^(-1)(at 3800 W kg^(-1)).The unique structural design and the reaction investigation of the electrode process can provide a reference for the development of transition metal chalcogenides anodes.

关键词： Multileveled MoWSe2/WO_(3)/C Structure change Heterostructure Metallic properties Enlarged lattice distance The activation process

来源：评论

学校读者我要写书评

暂无评论

Crystalline-symmetry-protected Majorana modes in coupled quantum dots

引用

Physical Review Research 2025年第1期7卷 L012022-L012022页

作者： Bradraj Pandey Gonzalo Alvarez Elbio Dagotto Rui-Xing Zhang Department of Physics and Astronomy The University of Tennessee Knoxville Tennessee 37996 USA Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Computational Sciences and Engineering Division Oak Ridge Tennessee 37831 USA Department of Materials Science and Engineering The University of Tennessee Knoxville Tennessee 37996 USA

We propose a minimalist architecture for achieving various crystalline-symmetry-protected Majorana modes in an array of coupled quantum dots. Our framework is motivated by the recent experimental demonstrations of two-site and three-site artificial Kitaev chains in a similar setup. We find that introducing a π-phase domain wall in the Kitaev chain leads to a pair of mirror-protected Majorana zero modes located at or near the junction. Joining two π junctions into a closed loop, we can simulate two distinct classes of two-dimensional higher-order topological superconducting phases, both carrying symmetry-protected Majorana modes around the sample corners. As an extension of the π junction, we further consider a general vertex structure where n Kitaev chains meet, i.e., a Kitaev n vertex. We prove that such an n vertex, if respecting a dihedral symmetry group Dn, necessarily carries n vertex-bound Majorana modes protected by the Dn symmetry. Resilience of the junction and vertex Majorana bound states against disorder and correlation effects is also discussed. Our architecture paves the way for designing, constructing, and exploring a wide variety of artificial topological crystalline phases in quantum-dot experiments.

关键词： Crystalline materials

来源：评论

学校读者我要写书评

暂无评论

Large anomalous Nernst effect and its bipolarity in the quaternary equiatomic Heusler alloys CrRuXGe (X=Co and Mn)

引用

Physical Review B 2024年第22期109卷 224415-224415页

作者： Amit Chanda Jadupati Nag Noah Schulz Aftab Alam K. G. Suresh Manh-Huong Phan Hariharan Srikanth Department of Physics Magnetic Materials Laboratory Department of Physics Materials Research Institute and Department of Materials Science and Engineering

Here we report on a comprehensive investigation of transverse magnetothermoelectric properties of the equiatomic quaternary Heusler alloys CrRuXGe (X = Co and Mn). Magnetic measurements reveal the presence of a glassy magnetic ground state owing to the energetically competing ferromagnetic and antiferromagnetic phases in CrRuCoGe at low temperatures, whereas CrRuMnGe exhibits soft ferromagnetic behavior with a weak martensitic transformation close to room temperature. The temperature-dependent anomalous Nernst coefficient (SANE) of CrRuMnGe shows noticeable changes around the martensitic transformation. While CrRuCoGe exhibits positive SANE, CrRuMnGe exhibits negative SANE throughout the measured temperature range. We demonstrate that the contribution of the anomalous transverse thermoelectric conduction dominates that of the anomalous Hall effect acting on the thermally generated carrier flow induced by the longitudinal Seebeck effect, which gives rise to the opposite polarity of SANE in these two alloys. Our detailed analysis indicates that the origin of the observed anomalous Nernst effect (ANE) in both of these alloys is dominated by the asymmetric skew scattering of charge carriers in the measured temperature regime. The sign change and tunability of ANE presented in this study provide a step forward toward the development of ANE-based efficient thermopile devices operating at room temperature utilizing the equiatomic quaternary Heusler alloys.

关键词： Magnetic interactions Magnetotransport Spintronics Thermal conductivity Thermoelectric effects Thermomagnetic effects

来源：评论

学校读者我要写书评

暂无评论

Experimental measurements of the granular density of modes via impact

引用

Physical Review E 2024年第1期110卷 014902-014902页

作者： Sydney A. Blue Salem C. Wright Eli T. Owens Physics Department School of Materials Science and Engineering

The jamming transition is an important feature of granular materials, with prior work showing an excess of low-frequency modes in the granular analog to the density of states, the granular density of modes. In this work, we present an experimental method for acoustically measuring the granular density of modes using a single impact event to excite vibrational modes in an experimental, three-dimensional, granular material. We test three different granular materials, all of which are composed of spherical beads. The first two systems are monodisperse collections of either 6 mm or 8 mm diameter beads. The third system is a bidisperse mixture of the previous two bead sizes. During data collection, the particles are confined to a box; on top of this box, and resting on the granular material, is a light, rigid sheet onto which pressure can be applied to the system. To excite the material, a steel impactor ball is dropped on top of the system. The response of the granular material to the impact pulse is recorded by piezoelectric sensors buried throughout the material, and the density of modes is computed from the spectrum of the velocity autocorrelation of these sensors. Our measurements of the density of modes show more low-frequency modes at low pressure, consistent with previous experimental and numerical results, as well as several low-frequency peaks in the density of modes that shift with applied pressure. Our method represents an experimentally simple technique for investigating the granular density of modes and may increase the accessibility and number of such measurements.

关键词： Density of states Jamming Mechanical & acoustical properties Packing & jamming problems Dry granular materials

来源：评论

学校读者我要写书评

暂无评论

Migration and proliferation drive the emergence of patterns in co-cultures of differentiating vascular progenitor cells

引用

Mathematical Biosciences and engineering 2024年第8期21卷 6731-6757页

作者： Zamora Alvarado, Jose E. McCloskey, Kara E. Gopinathan, Ajay School of Engineering University of California Merced MercedCA95343 United States Graduate Program in Materials and Biomaterials Science and Engineering University of California Merced MercedCA95343 United States Department of Physics University of California Merced MercedCA95343 United States

Vascular cells self-organize into unique structures guided by cell proliferation, migration, and/or differentiation from neighboring cells, mechanical factors, and/or soluble signals. However, the relative contribution of each of these factors remains unclear. Our objective was to develop a computational model to explore the different factors affecting the emerging micropatterns in 2D. This was accomplished by developing a stochastic on-lattice population-based model starting with vascular progenitor cells with the potential to proliferate, migrate, and/or differentiate into either endothelial cells or smooth muscle cells. The simulation results yielded patterns that were qualitatively and quantitatively consistent with experimental observations. Our results suggested that post-differentiation cell migration and proliferation when balanced could generate between 30–70% of each cell type enabling the formation of vascular patterns. Moreover, the cell-to-cell sensing could enhance the robustness of this patterning. These findings computationally supported that 2D patterning is mechanistically similar to current microfluidic platforms that take advantage of the migration-directed self-assembly of mature endothelial and mural cells to generate perfusable 3D vasculature in permissible hydrogel environments and suggest that stem or progenitor cells may not be fully necessary components in many tissue formations like those formed by vasculogenesis. ©2024 the Author(s)

关键词： Endothelial cells

来源：评论

学校读者我要写书评

暂无评论

Rational Design of Phase-Engineered WS2/WSe2 Heterostructures by Low-Temperature Plasma-Assisted Sulfurization and Selenization toward Enhanced HER Performance

引用

ACS Applied materials and Interfaces 2024年第25期16卷 32490-32502页

作者： Rehman, Bushra Kimbulapitiya, K. Date, Manisha Chen, Chieh-Ting Cyu, Ruei-Hong Peng, Yu-Ren Chaudhary, Mayur Chuang, Feng-Chuan Chueh, Yu-Lun Department of Materials Science and Engineering National Tsing Hua University Hsinchu30013 Taiwan College of Semiconductor Research National Tsing Hua University Hsinchu30013 Taiwan Department of Physics National Sun Yat-Sen University Kaohsiung80424 Taiwan Department of Materials Science and Engineering Korea University Seoul02841 Korea Republic of

Efficient hydrogen generation from water splitting underpins chemistry to realize hydrogen economy. The electrocatalytic activity can be effectively modified by two-dimensional (2D) heterostructures, which offer great flexibility. Furthermore, they are useful in enhancing the exposure of the active sites for the hydrogen evolution reaction. Although the 1T-metallic phase of the transition metal dichalcogenides (TMDs) is important for the hydrogen evolution reaction (HER) catalyst, its practical application has not yet been much utilized because of the lack of stability of the 1T phase. Here, we introduce a novel approach to create a 1T-WS2/1T-WSe2 heterostructure using a low-temperature plasma-assisted chemical vapor reaction (PACVR), namely plasma-assisted sulfurization and plasma-assisted selenization processes. This heterostructure exhibits superior electrocatalytic performance due to the presence of the metallic 1T phase and the beneficial synergistic effect at the interface, which is attributed to the transfer of electrons from the underlying WS2 layer to the overlying WSe2 layer. The WS2/WSe2 heterostructure catalyst demonstrates remarkable performance in the HER as evidenced by its small Tafel slope of 57 mV dec-1 and exceptional durability. The usage of plasma helps in replacing the top S atoms with Se atoms, and this ion bombardment also increases the roughness of the thin film, thus adding another factor to enhance the HER performance. This plasma-synthesized low-temperature metallic-phase heterostructure brings out a novel method for the discovery of other catalysts. © 2024 The Authors. Published by American Chemical Society.

关键词： Selenium compounds

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：