检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Zhao, Qinghua Chen, Peng Zheng, Dan Wang, Tao Castellanos-Gomez, Andres Frisenda, Riccardo State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi’an710072 China Key Laboratory of Radiation Detection Materials and Devices Ministry of Industry and Information Technology Xi’an710072 China Research & Development Institute of Northwestern Polytechnical University Shenzhen518057 China MadridE-28049 Spain Physics Department Sapienza University of Rome Rome00185 Italy

Van der Waals semiconductors, with ultrathin body thickness and dangling-bond-free surfaces, have been employed to fabricate a vast range of electronic and optoelectronic devices such as transistors, photodiodes and memories. The integration of these different functional elements into one single device, usually referred to as multifunctional device, has received great research attention in the recent years. In this work, we realized a multifunctional device, based on the van der Waals semiconductor Indium Selenide (InSe), which can work both as a high-quality Schottky diode with current rectification and photovoltaic characteristics and as a memory. By exploiting the all-dry deterministic transfer fabrication method, we deposited the 2D InSe channel onto pre-deposited graphite and platinum electrodes, whose theoretical work functions differ of ~1.0-1.4 eV. Thanks to a controllable InSe air passivation treatment, these devices, which start in a non-rectifying state with negligible electrodes-InSe barriers, gradually evolve into Schottky diodes, presenting a final sizeable Schottky barrier height of 550 ± 50 meV at the Pt-InSe interface, thus resulting in a gradual tuning of the device photoresponsivity and photovoltaic parameters (such as the open circuit voltage Voc). The multifunctional capabilities of these devices were demonstrated by using them as optoelectronic memories, which can achieve on-off ratios between the logical ‘1’ and ‘0’ up to 100 and retention times of thousands of seconds. This multifunctional behaviour can be ascribed to the traps present in the system, which on one side influences the metal-semiconductor barriers and on the other introduces charge storage capabilities at the base of the memory operation. Our results demonstrate that trap state modulation can be an important tuning knob for thin InSe in the field of electronics and optoelectronics. © 2022, The Authors. All rights reserved.

关键词： Selenium compounds

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Structure tailorable triple-phase and pure double-polar-phase flexible IF-WS_(2)@poly(vinylidene fluoride)nanocomposites with enhanced electrical and mechanical properties

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Journal of Materiomics 2020年第3期6卷 563-572页

作者： Dong Guo Kai Cai Pingye Deng Guoning Si Liangying Sun Fahui Chen Honglong Ning Li Jin Jingtao Ma School of Medical Instrument&Food Engineering University of Shanghai for Science&TechnologyShanghai200093China School of Materials Science&Engineering Beihang UniversityBeijing100191China Beijing Center for Physical and Chemical Analysis Beijing100089China Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhou510640China Electronic Materials Research Laboratory School of Electronic and Information EngineeringXi’an Jiaotong UniversityXi’an710049China State Key Laboratory of New Ceramics and Fine Processing Tsinghua UniversityBeijing100084China

A new low-cost high-permittivity flexible nanocomposite consisting of a polyvinylidene fluoride(PVDF)matrix and fullerene-like tungsten disulfide nanoparticle(IF-WS2 NP)filler was fabricated via a simple solution route.A comprehensive investigation by X-ray diffraction,attenuated total reflection-infrared spectroscopy,and differential scanning calorimetry(DSC)showed that 0.5e1 vol% of IF-WS_(2) induced a nonpolar α-phase to coexisting triple-phase transition in PVDF,whereas a slightly higher loading of 2 vol% induced pure double-polar β- and γ-*** results indicate that the structure and properties of the fabricated nanocomposite are easily *** during heating and cooling cycles and morphology observations further indicated that a polar phase was induced by the nucleation effect of the IF-WS2 NPs and electrostatic *** a consequence of the multiphase coexistence and structure homogeneity,nanocomposites with approximately 0.5-1 vol% of IF-WS_(2) NPs showed enhanced dielectric and energy-storage performance as well as enhanced tensile strength and *** new phase-tailorable nanocomposites with balanced properties are promising for applications as energystorage capacitors,piezoelectric sensors,and other flexible multifunctional *** results of this study will serve to deepen the understanding of the polymer polymorph and provide directions on new routes for fabrication of smart materials.

关键词： PVDF Polymorph Permittivity Piezoelectricity Flexibility

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Integrated filler metal/base metal manufacturing via cold spray additive manufacturing for brazing C f /SiC and superalloy

Transactions of Materials Research

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Transactions of materials Research 2025年第1期1卷

作者： Pengcheng Wang Weihan Liu Lei Gu Hao Ran Xiaoguo Song Zhaoyi Pan Haiyan Chen Wenya Li State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding Technologies Northwestern Polytechnical University Xi'an 710072 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China Xi'an Space Engine Company Limited Xi'an 710072 China

A new integrated filler metal/base metal manufacturing method by cold spray additive manufacturing is proposed. The integrated CuTi filler metal/GH3536 and CuTi + W composite filler metal/GH3536 are prepared by cold spray additive manufacturing techniques. The large plastic deformation of Cu and Ti particles and the tamping effect of W particles promote the interfacial bonding of particles, which improves the weldability of cold sprayed CuTi + W composite filler metals. Based on the cold sprayed CuTi + W composite filler metal, the C f /SiC composites and GH3536 are successfully brazed, and the typical microstructure and brazing mechanism are investigated. As a result, the shear strength of C f /SiC-GH3536 joint brazed by cold sprayed CuTi + W composite filler metal reaches 77 MPa. This study highlightes the great potential of cold spray additive manufacturing for integrated filler metal/base metal manufacturing in brazing.

关键词： Brazing Cold spray additive manufacturing Composite filler Interface reaction C f /SiC composite

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Van der Waals Spin-Orbit Torque Antiferromagnetic Memory

arXiv

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arXiv 2023年

作者： Zhang, Lishu Yuan, Zhengping Yang, Jie Zhou, Jun Jiang, Yanyan Li, Hui Cai, Yongqing Feng, Yuan Ping Zhu, Zhifeng Shen, Lei Department of Physics National University of Singapore Singapore117542 Singapore School of Information Science and Technology ShanghaiTech University Shanghai201210 China Key Laboratory of Material Physics School of Physics and Microelectronics Ministry of Education Zhengzhou University Zhengzhou450001 China Singapore138634 Singapore Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong University Jinan250061 China Institute of Applied Physics and Materials Engineering University of Macau Taipa China Center for Advanced 2D Materials National University of Singapore Singapore117546 Singapore Department of Mechanical Engineering National University of Singapore Singapore117542 Singapore

The technique of conventional ferromagnet/heavy-metal spin-orbit torque (SOT) offers significant potential for enhancing the efficiency of magnetic memories. However, it faces fundamental physical limitations, including hunting effects from the metallic layer, broken symmetry for enabling anti-damping switching, spin scattering caused by interfacial defects, and sensitivity to stray magnetic fields. To address these issues, we here propose a van der Waals (vdW) field-free SOT antiferromagnetic memory using a vdW bilayer LaBr2 (an antiferromagnet with perpendicular magnetic anisotropy) and a monolayer Td phase WTe2 (a Weyl semimetal with broken inversion symmetry). By systematically employing density functional theory in conjunction with non-equilibrium Green's function methods and macrospin simulations, we demonstrate that the proposed vdW SOT devices exhibit remarkably low critical current density approximately 10 MA/cm2 and rapid field-free magnetization switching in 250 ps. This facilitates excellent write performance with extremely low energy consumption. Furthermore, the device shows a significantly low read error rate, as evidenced by a high tunnel magnetoresistance ratio of up to 4250%. The superior write and read performance originates from the unique strong on-site (insulating phase) and off-site (magnetic phase) Coulomb interactions in electride LaBr2, a large non-zero z-component polarization in WTe2, and the proximity effect between them. Copyright © 2023, The Authors. All rights reserved.

关键词： Energy utilization

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Observation of Superoscillation Superlattices

arXiv

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arXiv 2024年

作者： Ma, Xin Zhang, Hao Wei, Wenjun Tai, Yuping Li, Xinzhong Shen, Yijie School of Chemistry and Chemical Engineering School of Physics and Engineering Henan University of Science and Technology Luoyang471023 China State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi'An710119 China Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology Luoyang471023 China Centre for Disruptive Photonic Technologies School of Physical and Mathematical Sciences The Photonics Institute Nanyang Technological University Singapore637371 Singapore School of Electrical and Electronic Engineering Nanyang Technological University Singapore639798 Singapore

Superoscillation (SO) wavefunctions, that locally oscillate much faster than its fastest Fourier component, in light waves have enhanced optical technologies beyond diffraction limits, but never been controlled into 2D periodic lattices. Here, we report the 2D superoscillation lattices (SOL) with controlled symmetries, where the local wavevector can be ~700 times larger than the global maximal wavevector (k0) in a localized region ~100 times smaller than the global minimal wavelength (λ0). We also demonstrate the superoscillation superlattices (SOSL) as twisted bilayer Moirépatterns of two SOL, akin to the magic angle tuning in advanced twistronics, we can continually tune the on-demand SO with local maximal wavevector in a range of 450k0–700k0 and with ~ λ0/100–λ0/1000. The twistronic SOSL will advance optical imaging and metrology into extreme higher-dimensional *** Codes 78 Copyright © 2024, The Authors. All rights reserved.

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Effect of ppm-level La modification on hot corrosion behaviour of single crystal superalloy CMSX-4

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Journal of Alloys and Compounds 2025年 1035卷

作者： Jiangkun Fan Jiayu Li Yuelin Song Dian Jiao Zhiying Zhu Xiao Ma Ruihao Yuan Jianbo Yu Jun Wang Hongchao Kou Zhongming Ren Jinshan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 China National & Local Joint Engineering Research Center for Precision Thermoforming Technology of Advanced Metal Materials Xi’an 710072 China Chongqing Innovation Center Northwestern Polytechnical University Chongqing 401135 China State Key Laboratory of Advanced Special Steels School of Materials Science and Engineering Shanghai University Shanghai 200072 China

Doping with trace levels of rare earth elements is an effective approach to enhancing the oxidation and hot corrosion resistance of superalloys. In this study, the hot corrosion behaviour of ppm lanthanum (La) (0 ppm, 40 ppm, and 200 ppm) modified CMSX-4 superalloy and the action micro-mechanism of La were systematically clarified and summarised by SEM, EDS, EPMA, FIB and TEM. The results indicated that ppm-level La doping significantly decreased the corrosion rate of the alloy by more than half. However, increasing the doping level of La does not affect the hot corrosion kinetics of the modified alloys. Compared to unmodified alloys, La-modified alloys exhibit a denser and more complete surface corrosion product, resulting in longer weight gain “plateaus” on the weight gain curves. Further analysis shows La segregation provides a short-circuit diffusion channel for oxygen and promotes the external diffusion of Al, Ti, and Ta, thereby improving the integrity and densification of the protective oxide film. The hot corrosion reaction of the alloy with lower La content (40 ppm) is generally more stable.

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Appending Coronene Diimide with Carbon Nanohoops Allows for Rapid Intersystem Crossing in Neat Film

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Angewandte Chemie 2024年第18期136卷

作者： Jingjing Zhao Jingwen Xu Dr. Huaxi Huang Kangwei Wang Prof. Dr. Di Wu Prof. Dr. Ramesh Jasti Prof. Dr. Jianlong Xia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices Wuhan University of Technology 430070 Wuhan China These authors contributed equally International School of Materials Science and Engineering Wuhan University of Technology 430070 Wuhan China School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology 430070 Wuhan China Department of Chemistry and Biochemistry Materials Science Institute University of Oregon 97403 Eugene Oregon USA

The development of innovative triplet materials plays a significant role in various applications. Although effective tuning of triplet formation by intersystem crossing (ISC) has been well established in solution, the modulation of ISC processes in the solid state remains a challenge due to the presence of other exciton decay channels through intermolecular interactions. The cyclic structure of cycloparaphenylenes (CPPs) offers a unique platform to tune the intermolecular packing, which leads to controllable exciton dynamics in the solid state. Herein, by integrating an electron deficient coronene diimide (CDI) unit into the CPP framework, a donor-acceptor type of conjugated macrocycle ( CDI-CPP ) featuring intramolecular charge-transfer (CT) interaction was designed and synthesized. Effective intermolecular CT interaction resulting from a slipped herringbone packing was confirmed by X-ray crystallography. Transient spectroscopy studies showed that CDI-CPP undergoes ISC in both solution and the film state, with triplet generation time constants of 4.5 ns and 238 ps, respectively. The rapid triplet formation through ISC in the film state can be ascribed to the cooperation between intra- and intermolecular charge-transfer interactions. Our results highlight that intermolecular CT interaction has a pronounced effect on the ISC process in the solid state, and shed light on the use of the characteristic structure of CPPs to manipulate intermolecular CT interactions.

关键词： cycloparaphenylenes rylene diimides triplet materials intersystem crossing

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Corrosion and Microstructure Evolution of He+ Irradiated Tungsten Pfms

SSRN

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SSRN 2022年

作者： Huang, Jun Li, Yangyang Yuan, Guohu Liu, Qing Zuo, Tong Xu, Guangqing Lv, Jun Ding, Xiaoyu Hong, Yu Luo, Laima Tan, Xiaoyue Chen, JunLing Wu, Yuchen School of Materials Science and Engineering Hefei University of Technology Hefei230009 China China International S&T Cooperation Base for Advanced Energy and Environmental Materials Hefei University of Technology Hefei230009 China Institute of Laser Advanced Manufacturing Zhejiang University of Technology Hangzhou310014 China Engineering Research Center of High Performance Copper Alloy Materials and Processing Ministry of Education Hefei230009 China Chinese Academy of Sciences HFIPS Institute of Plasma Physics Hefei230031 China Key Laboratory of Advanced Functional Materials and Devices of Anhui Province Anhui Provincial International S&T Cooperation Base for Advanced Energy Materials Hefei University of Technology Hefei230009 China

The microstructure, composition and surface roughness of W-PFMs were analyzed by scanning electron microscopy(SEM), X-ray diffraction(XRD) and atomic force microscopy(AFM) under different He + irradiating conditions. Apparent roughness(damage) evolution in the surfaces of W-PFMs were studied, revealing the forming process of wavy, step-like and fuzz structures under different irradiating doses. The differences in the corrosion resistance of unirradiated as well as irradiated W-PFMs were investigated respectively, by potentiodynamic polarization curves and neutral salt spray tests(NSS). The experimental results showed that the He + irradiated materials(W-FZ60) had better corrosion resistance, with 3.79 times of AC impedance value than that of unirradiated tungsten. After 720 h of neutral salt spray test, the surface of unirradiated specimen showed numbers of continuous cracks in the substrate. In contrast, no apparent micro-cracks and other damages were found in the surface of He + irradiated specimens under the same NSS testing. In this paper, the macro- and micro- bridge had been built to elaborate the damage evolution in irradiating, such as the fuzz-like structures formed in higher irradiations seems to be the "adsorption film" in this study, which played important roles in blocking access to corrosives, further enhancing corrosion resistance of the irradiated W-PFMs. © 2022, The Authors. All rights reserved.

关键词： Corrosion resistance

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In-Situ Growth of Z-Scheme Ag/Ppy/Bivo4 Core-Shell Structure for Efficient Co2 Photoreduction into Hydrocarbon Fuels

SSRN

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SSRN 2022年

作者： Guo, Xin Sun, Xiao-Jie Wang, Zhi-Yuan Zhang, Jia-Hui Hu, Yu-Feng Liu, Yan-Duo State Key Laboratory of Heavy Oil Processing and High Pressure Fluid Phase Behavior Property Research Laboratory China University of Petroleum Beijing102249 China School of Chemistry and Materials Science University of Science and Technology of China Hefei Anhui230026 China College of Chemistry and Chemical Engineering Shanxi University Taiyuan030006 China

Photocatalytic reduction of CO2 to hydrocarbons (e.g., CH4) or CO under mild conditions, providing a feasible and promising method for the environmental remediation and utilization of carbon resources. However, since CO2-to-CO is a two‑electron process, and even CO2-to-CH4 is an eight-electron reaction, it is a challenging task to achieve CO2 activation with an extremely short effective charge lifetime. In this paper, a synergistic effect strategy is used to prepare Ag nanoparticles modified PPy/BiVO4 Z-Scheme composites for synergizing the charge separation and surface catalytic processes in CO2 reduction reaction. With the joint efforts of synergy, the optimal photocatalyst achieves an efficient CO2 reduction yield (5.92 μmol·g-1·h-1) with an exceptionally high CO selectivity of 85.8% and the corresponding O2 evolution. Based on the result analysis, it can be clearly proved that the excellent CO2 reduction performance relies on the Z‑Scheme charge transfer mechanism between PPy/BiVO4 composites interface and the strong catalytic effect of Ag nanoparticles on CO2. Furthermore, the detailed processes of deoxygenation and proton acquisition during CO2 reduction is revealed by in-situ DRIFTS and NAP-XPS. This paper demonstrates a strategy for designing efficient photocatalysts toward reduction of CO2 to higher value-added chemicals, and highlights the importance of catalysis and charge separation to the synergy of key steps in catalytic reactions. © 2022, The Authors. All rights reserved.

关键词： Silver nanoparticles

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Core-Shell Cocuox@Mox (M = Nb, Ti and CE) Catalysts with Outstanding Durability and Resistance to H2o for the Catalytic Combustion of O-Dichlorobenzene

SSRN

引用

SSRN 2022年

作者： Wu, Shixing Zhao, Haijun Zhicheng, Tang Zhang, Jiyi State Key Laboratory for Oxo Synthesis and Selective Oxidation National Engineering Research Center for Fine Petrochemical Intermediates Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China School of Petroleum and Chemical Lanzhou University of Technology Lanzhou730050 China Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing Yantai264006 China

Configuring Co-based catalysts with excellent activity, durability, anti-H2O capability and superior chlorine resistance is an effective strategy for catalytic combustion of CVOCs. In this work, we elaborated a CoCuOx catalysts with core-shell structure. The CoCuOx dodecahedron surface was successfully coated with shells of Nb2O5, TiO2, and CeO2 using a range of conventional synthesis methods. The prepared core-shell catalysts (CoCuOx@TiO2 and CoCuOx@Nb2O5) were found to generate plentiful acid sites as well as abundant lattice oxygen species, indicating a strong interaction between the core and shell layers that resulted in a significant enhancement of catalytic activity. In addition, by-products generation was successfully controlled by acid sites and lattice oxygen species. More importantly, the core-shell structure design significantly improved the thermal stability and anti-H2O capability of the catalysts. Furthermore, the possible formation pathways and reaction mechanisms were proposed based on in-situ FTIR and selectivity analysis. © 2022, The Authors. All rights reserved.

关键词： Titanium dioxide

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