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Creating Ferroelectricity in Monoclinic (HfO2)1/(CeO2)1 Superlattices

Physical Review Letters 2024年第25期132卷 256801-256801页

作者： Hong Jian Zhao Yuhao Fu Longju Yu Yanchao Wang Yurong Yang Laurent Bellaiche Yanming Ma Key Laboratory of Material Simulation Methods and Software of Ministry of Education College of Physics Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education) College of Physics International Center of Future Science State Key Laboratory of Superhard Materials College of Physics National Laboratory of Solid State Microstructures and Jiangsu Key Laboratory of Artificial Functional Materials Department of Materials Science and Engineering Smart Ferroic Materials Center Physics Department and Institute for Nanoscience and Engineering

Ferroelectricity in CMOS-compatible hafnia (HfO2) is crucial for the fabrication of high-integration nonvolatile memory devices. However, the capture of ferroelectricity in HfO2 requires the stabilization of thermodynamically metastable orthorhombic or rhombohedral phases, which entails the introduction of defects (e.g., dopants and vacancies) and pays the price of crystal imperfections, causing unpleasant wake-up and fatigue effects. Here, we report a theoretical strategy on the realization of robust ferroelectricity in HfO2-based ferroelectrics by designing a series of epitaxial (HfO2)1/(CeO2)1 superlattices. The designed ferroelectric superlattices are defects free, and most importantly, on the base of the thermodynamically stable monoclinic phase of HfO2. Consequently, this allows the creation of superior ferroelectric properties with an electric polarization >25 μC/cm2 and an ultralow polarization-switching energy barrier at ∼2.5 meV/atom. Our work may open an avenue toward the fabrication of high-performance HfO2-based ferroelectric devices.

关键词： Epitaxial strain Ferroelectricity Order parameters Oxides First-principles calculations

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Upcycling of Polyethylene/Polypropylene Mixtures Promoted by Well-Controlled Multiblock Olefin Copolymers

SSRN

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SSRN 2024年

作者： Kang, Yuze Wang, Hanlin Meng, Fanmao Chen, Shangtao Du, Bin Jiang, Zihao Wu, Jiajia Zhang, Kebin Gao, Huan Pan, Li Li, Yuesheng Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and Engineering Tianjin University Tianjin300072 China Advanced Materials Research Institute Co. Ltd Shanghai200100 China Advanced Materials Research Center Petrochemical Research Institute PetroChina Company Limited Beijing102206 China

Polyethylene (PE) and isotactic polypropylene (iPP) are two of the most widely used polymer materials, whose huge consumptions urge people to tackle their recycling problem. The incompatibility of PEs and PPs has resulted in their waste streams being recycled into low-value products with poor mechanical properties. Herein, a series of iPP-based olefin block copolymers (OBC) with up to five alternating hard/soft blocks were prepared via coordinative chain transfer polymerization. The facile synthetic strategy of multiblock OBCs not only overcame the inefficiency and diseconomy of living coordination polymerization, but also avoided the critical requirements of complex dual-catalyst systems for chain shuttling polymerization, making it suitable for low-cost and large-scale production of OBCs. These well-designed OBCs provided excellent elastomeric properties combining high strength, high elongation, and high elastic recovery. More importantly, they also demonstrated a strong ability in the upcycling of PE/PP mixtures, transforming brittle blends into tough materials. The PE/PP blends compatibilized with OBCs exhibited greatly improved interfacial adhesion and mechanical properties, with up to 25 times higher elongation compared to uncompatibilized blends. It was further demonstrated by the extruding-blow-molded bottles prepared using post-consumer PE/PP products, where recycled bottles containing OBCs exhibited much better mechanical properties than those without OBC. The synthetic strategy of OBCs and the upcycling route of PE/PP blends in this work are not only of great academic value, but also of substantial economic and environmental significance, providing insights into the sustainable development of plastics. © 2024, The Authors. All rights reserved.

关键词： Polyethylenes

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Novel Designed PEG-Dicationic Imidazolium-Based Ionic Liquids as Effective Plasticizers for Sustainable Polylactide

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Chinese Journal of Chemistry 2021年第8期39卷 2234-2240页

作者： Huijie Zuo Xiangjian Chen Yingli Ding Liang Cui Baomin Fan Li Pan Kunyu Zhang School of Chemical Engineering and Technology Tianjin UniversityTianjin 300350China School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin 300350China Polyolefin Research Department Petrochina Petrochemical Research InstituteBeijing 102206China Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics Beijing Technology and Business UniversityBeijing 100048China

A series of novel polyethylene glycol-dicationic imidazolium-based ionic liquids(mPEG-ILs)were synthesized by facile quaternization reaction from various elaborately designed di-imidazoles and PEG,which were then stud... 详细信息

关键词： Ionic liquids Plasticizers Polylactide Chain structure Hydrogen bonds

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Photoresist systems in floating T-gate fabrication for GaN high electron mobility transistors

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Nano Materials science 2024年

作者： Xiang, Shi Li Ding, Qi-Chao Liu, Jun Hu, Hao Zhao, Bo Lu, Shuang Zan Huang, Fan Cunha, Joao Rodrigues, José Yu, Zhipeng Yin, Hong JFS Laboratory Wuhan430206 China Av. Mestre Jose Veiga Braga4715330 Portugal Key Laboratory of Hunan Province for Advanced Carbon-based Functional Materials School of Chemistry and Chemical Engineering Hunan Institute of Science and Technology Yueyang414006 China

Gallium Nitride (GaN) high electron mobility transistors (HEMTs) have garnered significant attention in micro/millimeter wave and terahertz technologies due to their unique material properties, including a large bandgap, a strong electron mobility, a high charge density, and resistance to high-temperatures. Implementing a floating T-gate structure through electron beam lithography has been explored to enhance the frequency performance of GaN HEMTs. To address this, bilayer and trilayer resist systems have been developed successively. This comprehensive review details the critical issues of T-gate manufacturing strategies using EBL technology. We explore the benefits and drawbacks of various approaches, considering factors such as cost, resolution, process complexity, and the challenges encountered during the stripping process. In addition, we summarize and discuss the potential negative electron beam resists that have emerged in recent years for T-gate fabrication. Herein, this review represents the first comprehensive compilation of the fabrication techniques for floating T-gates from the perspective of electron beam photoresists. It aims to provide researchers and practitioners with a consolidated resource encompassing the challenges and advancements in T-gate fabrication, highlighting the role of electron beam lithography and photoresist selection. © 2024 Chongqing University

关键词： Gallium nitride

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A Novel Model for Buckling of composite Shell: Ring Stiffened Shell and Stiffened Shell with Cutout Under Hydrostatic Pressure

SSRN

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SSRN 2023年

作者： Zhao, Chengwei Wu, Linzhi Zhao, Yang Pan, Shidong Zhou, Zhengong Center for Composite Materials and Structures Harbin Institute of Technology Harbin150001 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150001 China

Aiming at the buckling problem of ring stiffened shells and shells with stiffened cutout fabricated by the filament winding process under hydrostatic pressure, a new form of equilibrium equations is given in this paper based on the high-order shear deformation theory (HSDT), combined with Messager's model of the geometrical imperfection, a theoretical model is proposed. The model contains both the ring stiffened shell model (RSSM) and the stiffened shell with cutout model (SSCM), in which the change in the thickness of the shell is described in the form of Fourier series to be taken into account in the stiffness matrix. Bringing the model into the solution procedure of critical buckling pressure, the results were compared with the results of the traditional stiffened cylindrical shell (SCS) model. The results showed that in the case of the shell stiffened by a ring stiffener in the middle, the error can be reduced by 71.08% to 81.22% compared with the SCS model. The results show that the small stiffened cutouts of the thin shell and the large stiffened cutouts of the moderately thick shell have little effect, while ring stiffener in the middle has a greater one, on the critical buckling pressure. © 2023, The Authors. All rights reserved.

关键词： Buckling

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Shear banding in monodisperse polymer melt

arXiv

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arXiv 2023年

作者： Peng, Fan Cao, Renkuan Nie, Cui Xu, Tingyu Li, Liangbin National Synchrotron Radiation Laboratory Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film CAS Key Laboratory of Soft Matter Chemistry University of Science and Technology of China Hefei230026 China

We performed a series of molecular dynamics simulations on monodisperse polymer melts to investigate the formation of shear banding. Under high shear rates, shear banding occurs, which is accompanied with the entanglement heterogeneity intimately. Interestingly, the same linear relationship between the end-to-end distance Ree and entanglement density Z is observed at homogeneous flow before the onset of shear banding and at shear banding state, where Ree ~ [ln(Wi0.87) - ξ0]Z is proposed as the criterion to describe the dynamic force balance of molecular chain in flow with a high rate. We establish a scaling relation between the disentanglement rate Vd and Weissenberg number Wi as Vd ~ Wi0.87 for stable flow in homogeneous shear and shear banding states. Deviating from this relation leads to force imbalance and results in the emergence of shear banding. The formation of shear banding prevents chain from further stretching and disentanglement. The transition from homogeneous shear to shear banding partially dissipates the increased free energy from shear and reduces the free energy of the system. Copyright © 2023, The Authors. All rights reserved.

关键词： Polymer melts

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Gate-tuned antiferromagnetic MnBi4Te7: A candidate for high-temperature high-Chern-number insulator at zero magnetic field

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Physical Review B 2025年第11期111卷 115420-115420页

作者： Hengning Wang Ding Li Yan Feng Tao Qin Yingze Jia Hongwei Zhang Chuandi Pan Yan Wang Wei Ning Anhui Key Laboratory of Low-Energy Quantum Materials and Devices High Magnetic Field Laboratory HFIPS Chinese Academy of Sciences Hefei Anhui 230031 China University of Science and Technology of China Hefei 230026 China Department of Materials Science & Engineering Hefei National Research Center for Physical Sciences at the Microscale CAS Key Lab of Materials for Energy Conversion Anhui Laboratory of Advanced Photon Science and Technology University of Science and Technology of China Hefei China School of Physics and Optoelectronics Engineering Anhui University Hefei Anhui Province 230601 People's Republic of China Information Materials and Intelligent Sensing Laboratory of Anhui Province Anhui Key Laboratory of Magnetic Functional Materials and Devices Institutes of Physical Science and Information Technology Anhui University Hefei 230601 China Department of Physics Shaanxi University of Science and Technology Xi'an 710021 China

The quantum anomalous Hall insulator is characterized by a quantized Hall resistance plateau of h/(Ce2) with C being the Chern number. Previously, high-Chern-number insulators with C≥2 that intrinsically suppress the energy dissipation in quantized electrical transport have been realized in few-layer MnBi2Te4 nanoflakes under moderate magnetic fields or in Cr-doped topological insulators at extremely low temperatures. It has nevertheless proven elusive to achieve a high-temperature high-Chern-number insulator at zero magnetic field. Here, we demonstrate that the magnetic state in MnBi4Te7 nanoflakes can be consecutively tuned from an antiferromagnetic (AFM) state to an AFM-ferromagnetic (FM) coexistence state, and finally to a robust ferromagnetic (FM) state with large coercivities at temperatures up to 3 K via a protonic gate. This AFM-FM phase transition is well captured by density functional theory simulations that the FM state develops in MnBi4Te7 under hole doping. Notably, we find that the Chern number of FM MnBi4Te7 can be largely tuned not merely by the Zeeman field but also by the sample thickness. Our work demonstrates that gate-tuned MnBi4Te7 nanoflakes hold high potentials for realizing a high-temperature high-Chern-number insulator at zero magnetic field and promising applications in the field of low-energy electronics.

关键词： Ferromagnetism

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Efficient Microwave Absorber for Phase-Engineered Modulation of MoS2 Induced by Trace Atom Doping

SSRN

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SSRN 2025年

作者： Ma, Long He, Yunfei Dou, Sihao Xia, Long Liu, Dongdong Zhong, Bo Huang, Xiaoxiao School of Materials Science and Engineering Harbin Institute of Technology at Weihai Weihai264009 China School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China MIIT Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology Harbin Institute of Technology Harbin150001 China

The traditional electromagnetic microwave (EM) absorption materials are limited by the electromagnetic response characteristics dominated by a single loss mechanism, and it is difficult to realize the cooperative optimization of multiple loss mechanisms and impedance matching. In this study, the phase structure engineering and defect characteristics of MoS2 were controlled by heteroatom doping strategy, and Fe-doped yolk-shell MoS2 nanoflower microspheres EM absorption material was successfully prepared. The introduction of Fe atoms can form an atomic-level "electron-rich center" defect, induce crystal structure distortion, and thus realize the construction of a high-density and stable 1T/2H heterogeneous interface. The ratio of 1T/2H phase increases with the increase of the gradient of Fe atom doping. Specifically, the 8Fe-MoS2 sample demonstrated excellent EM absorption performance at a matching thickness of 1.95mm, with a maximum effective absorption bandwidth (EAB) of 5.36 GHz and a minimum reflection loss (RL) of -72.18 dB (1.65 mm). Through detailed characterization and multi-scale simulation, it is revealed that the superior EM absorption performance is the result of the synergistic effect of Fe defect induced polarization, interface polarization at high density heterogeneous interface, resistance loss and EM transmission path optimization. This multi-scale control strategy precisely combines the coupling effect of MoS2's defect characteristics and phase structure with multiple dielectric loss mechanisms, which provides a new design idea for developing high-performance MoS2-based EM absorption materials. © 2025, The Authors. All rights reserved.

关键词： Crystal atomic structure

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Internal field study of 21700 battery based on long-life embedded wireless temperature sensor

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Acta Mechanica Sinica 2021年第6期37卷 895-901,I0002页

作者： Le Yang Na Li Likun Hu Shaoqi Wang Lin Wang Jiang Zhou Wei-Li Song Lei Sun Tai-Song Pan Hao-Sen Chen Daining Fang AML CNMMDepartment of Engineering MechanicsTsinghua UniversityBeijing100084China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing100081China Beijing Key Laboratory of Lightweight Multi-Functional Composite Materials and Structures Beijing Institute of TechnologyBeijing100081China School of Information and Electronics Beijing Institute of Technology BeijingBeijing100081China Lishen Research Institute Tianjin Lishen Battery Joint-Stock Co.Ltd.Tianjin300384China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China

The safety of lithium-ion batteries is an essential concern where instant and accurate temperature sensing is *** is generally desired to put sensors inside batteries for instant ***,the transmission of internal measurement outside batteries without interfering their normal state is a non-trivial task due to the harsh electrochemical environment,the particular packaging structures and the intrinsic electromagnetic shielding problems of *** this work,a novel in-situ temperature sensing framework is proposed by incorporating temperature sensors with a novel signal transmission *** signal transmission solution uses a self-designed integrated-circuit which modulates the internal measurements outside battery via its positive pole without package *** experimental results validate the noninterference properties of the proposed *** proposed in-situ temperature measurement by the self-designed signal modulation solution has a promising potential for in-situ battery health monitoring and thus promoting the development of smart batteries.

关键词： Internal field study Embedded sensor Wireless temperature transmission Lithium-ion battery

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Selectivity regulation of CO_(2)electroreduction on asymmetric AuAgCu tandem heterostructures

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Nano Research 2022年第9期15卷 7861-7867页

作者： Yating Zhu Zengqiang Gao Zhicheng Zhang Ting Lin Qinghua Zhang Huiling Liu Lin Gu Wenping Hu Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistrySchool of ScienceTianjin UniversityTianjin 300072China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Collaborative Innovation Center of Quantum Matter Beijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Institute for New Energy Materials and Low-Carbon Technologies School of Materials Science and EngineeringTianjin Key Laboratory of Advanced Functional Porous MaterialsTianjin University of TechnologyTianjin 300384China

Rational design and synthesis of multimetallic nanostructures(NSs)are fundamentally important for electrochemical CO_(2)reduction reaction(CO_(2)RR).Herein,a multi-step seed-mediated growth method is applied to synthesize asymmetric AuAgCu heterostructures using Au nanobipyramids as nucleation seeds,in which their composition and structures are well *** find that the selectivity of C_(2)products for CO_(2)RR could be effectively regulated by tandem catalysis and electronic effect over trimetallic AuAgCu ***,the Faraday efficiency toward ethanol could reach up to 37.5%at a potential of−0.8 V versus reversible hydrogen electrode over asymmetric Au1Ag1Cu5 heterostructures with segregated domains of three constituent *** work provides an efficient strategy for the synthesis of multicomponent architectures to boost their promising application in CO_(2)RR.

关键词： CO_(2)reduction electrocatalysis tandem catalysis multimetallic nanostructure asymmetric heterostructure

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