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Lateral strain tailoring in manganite homostructures assisted by atomic-flat freestanding membranes

Nano Research 2023年第5期16卷 7829-7836页

作者： Yufei Wang Yuchen Zhu Shengru Chen Dongke Rong Qiao Jin Er-Jia Guo College of Materials Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China Department of Physics&Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Complex oxide thin films exhibit intriguing phenomena due to the coupling between multiple degrees of freedom through interfacial structural *** tailoring of structural parameters determines unique band structure and phonon modes,regulating emergent magnetic and electrical properties of oxide ***,the construction of different strained and oriented domains in one intact oxide thin film is impossible using conventional *** we report the fabrication and quantitative structural analysis of La_(0.7)Sr_(0.3)MnO_(3)(LSMO)homostructures assisted by atomic-flat freestanding *** substrates and suspended membranes regulate the epitaxial strain and orientation of subsequently grown *** results demonstrate an ultrathin transition layer(~4 atomic layers)between freestanding membranes and LSMO films is formed due to the strain *** work offers a simple and scalable methodology for fabricating unprecedented innovative functional oxide homostructures through artificially controlled synthesis routes.

关键词： transmission electron microscopy oxide homostructure freestanding membranes manganites strain engineering

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Freestanding single-crystal superconducting electron-doped cuprate membrane

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Physical Review materials 2025年第2期9卷 L021802-L021802页

作者： S. Sandik Bat-Chen Elshalem A. Azulay M. Waisbort A. Kohn B. Kalisky Y. Dagan School of Physics and Astronomy Tel Aviv University Tel Aviv 6997801 Israel Department of Physics and Institute of Nanotechnology and Advanced Materials Bar-Ilan University Ramat-Gan 5290002 Israel Department of Materials Science and Engineering The Iby and Aladar Fleischman Faculty of Engineering Tel Aviv University Tel Aviv 6997801 Israel

Thin films of cuprate superconductors are easier to control in terms of doping as compared to bulk samples. However, they require specific substrates to facilitate epitaxial growth. These substrates are often incompatible with materials used in electronic applications. Furthermore, it is challenging to separate the substrate's properties from the material of interest. Here, we demonstrate the fabrication of an electron-doped cuprate membrane. We show that the membrane has a coherent crystal structure. Furthermore, the superconducting properties of the membrane postliftoff closely resemble those of the thin films preliftoff, as revealed by a scanning superconducting quantum interference device (SQUID) microscope. Such membranes pave the way for designing new material properties and incorporating complex superconducting materials into typically incompatible electronic devices.

关键词： Single crystals

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Enhancing corrosion resistance of MAO coatings on Al alloy LY12 through in situ co-doping with zinc phosphate and cerium phosphate

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Corrosion Communications 2025年第1期17卷 35-43页

作者： Chao Yang Tao Ying Aihui Huang Jian Huang Pinghu Chen Paul K.Chu Xiaoqin Zeng National Engineering Research Center of Light Alloy Net Forming School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University Department of Chemistry University of Munich(LMU) College of Mechanical Engineering Key Laboratory of Hunan Province of Equipment Safety Service Technology under Extreme Environment University of South China Department of Physics Department of Materials Science&Engineering and Department of Biomedical Engineering City University of Hong Kong

Corrosion of aluminum（Al） alloys during service limits many applications. Micro-arc oxidation（MAO） coatings can enhance corrosion resistance, but porous defects in the films undermine their effectiveness. Here, by mixing a phosphate electrolyte with soluble Zn and Ce salts, zinc phosphate and cerium phosphate co-doped MAO corrosion-resistant coating is prepared on Al alloy LY12. Zinc phosphate and cerium phosphate are incorporated in situ to form an amorphous encapsulated nanocrystalline structure. During long-term corrosion, Zn2+is released and deposited as corrosion products Zn（OH）2to cover weak corrosion micro-regions in the coating. Simultaneously, Ce3+released from MAO coating co-doped with zinc phosphate/cerium phosphate forms Zn（OH）2/Ce（OH）3due to the small solubility product Kspto further enhance corrosion resistance. Compared to pristine Al alloy,corrosion potential increases from -1.306 to -0.819 VSCE, and corrosion current density decreases by 4 orders of magnitude from 2.6 × 10-6to 2.5 × 10-10A·cm-2. Co-doped MAO coating significantly enhances corrosion resistance of Al alloy LY12 and shows great potential for a wide range of applications.

关键词： Aluminum alloys Micro-arc oxidation coating Corrosion resistance Zinc phosphate Cerium phosphate

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A high-energy-density long-cycle lithium–sulfur battery enabled by 3D graphene architecture

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Carbon Energy 2024年第11期6卷 275-285页

作者： Yan Cheng Bihan Liu Xiang Li Xin He Zhiyi Sun Wentao Zhang Ziyao Gao Leyuan Zhang Xiangxiang Chen Zhen Chen Zhuo Chen Lele Peng Xiangfeng Duan Tsinghua Shenzhen International Graduate School Institute of Materials Research Tsinghua UniversityShenzhenChina Department of Materials Physics and Chemistry School of Materials Science and Engineering Energy & Catalysis Center Beijing Institute of TechnologyBeijingChina Department of Chemistry and Biochemistry University of CaliforniaLos AngelesCaliformiaUSA

Lithium–sulfur(Li–S)battery is attracting increasing interest for its potential in low-cost high-density energy ***,it has been a persistent challenge to simultaneously realize high energy density and long cycle ***,we report a synergistic strategy to exploit a unique nitrogen-doped three-dimensional graphene aerogel as both the lithium anode host to ensure homogeneous lithium plating/stripping and mitigate lithium dendrite formation and the sulfur cathode host to facilitate efficient sulfur redox chemistry and combat undesirable polysulfide shuttling effect,realizing Li–S battery simultaneously with ultrahigh energy density and long cycle *** as-demonstrated polysulfide-based device delivers a high areal capacity of 7.5 mAh/cm^(2)(corresponds to 787 Wh/L)and an ultralow capacity fading of 0.025%per cycle over 1000 cycles at a high current density of 8.6 mA/cm^(2).Our findings suggest a novel strategy to scale up the superior electrochemical property of every microscopic unit to a macroscopic-level performance that enables simultaneously high areal energy density and long cycling stability that are critical for practical Li–S batteries.

关键词： cathode/anode host lithium-sulfur battery long cycle life N-modified graphene aerogel ultrahigh energy density

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Metallic Sb-stabilized porous silicon with stable SEI and high electron/ion conductivity boosting lithium-ion storage performance

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Rare Metals 2024年第9期43卷 4234-4242页

作者： Jia-Guo Deng Hao-Qin Feng Yu-Long Xu Si-Guang Guo Jian-Ping Li Kai-Fu Huo Ji-Jiang Fu Biao Gao Pual-K.Chu The State Key Laboratory of Refractories and Metallurgy and Institute of Advanced Materials and Nanotechnology Wuhan University of Science and TechnologyWuhan 430081China Wuhan National Laboratory for Optoelectronics(WNLO) School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074China Department of Physics Department of Materials Science&Engineeringand Department of Biomedical EngineeringCity University of Hong KongHong Kong 999077China

Silicon(Si)has mild discharge potential and high theoretical capacity,making it a highly desirable material for lithium-ion batteries(LIBs).Nevertheless,the excessive volume expansion,poor ion/electron conductiv ity and unstable solid electrolyte interface(SEI)hinde practical application to ***,the metallic antimony(Sb)stabilized porous Si(SiDSb)composite was prepared by magnesiothermic reduction of Sb_(2)O_(3)and Mg_(2)Si and chemical etching to remove the by-product of *** highly conductive Sb nanodots embedded in the Si liga ments promote not only the formation of conductive and stable LiF-rich SEI,but also the electron/ion transpor ability of *** to the outstanding bulk/interface stability,excellent conductivity,as well as ideal porous structure,the SiDSb electrode demonstrates a capacity of820 mAh·g^(-1)after undergoing 320 turns at 1000 mA·g^(-1).Additionally,it exhibits a stable capacity of 675 m Ah·g^(-1)when tested at a higher current density of 5000 m A·g^(-1).The results reveal a viable solution to solve three problems at the same time,namely the poor conductivity,inferior SEI and excessive volume expansion of Si,boding well for the design of Si-based materials for high-energy LIBs.

关键词： Silicon Anodes Lithium-ion batteries Antimony Solid electrolyte interphase

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Giant anisotropy of magnetic damping in an epitaxial Cr/Fe bilayer with the absence of magnetocrystalline anisotropy

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Physical Review materials 2024年第4期8卷 L041401-L041401页

作者： Thanh-Huong Thi Nguyen Jungmin Park Jae-Hyun Ha Soogil Lee Van Quang Nguyen Nyun Jong Lee Byong-Guk Park Sunglae Cho Jung-Il Hong Sanghoon Kim Department of Physics and Chemistry Daegu Gyeongbuk Institute of Science and Technology Daegu 42988 Korea Department of Physics Korea Advanced Institute of Science and Technology Daejeon 34141 Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology Daejeon 34141 Korea Korea Atomic Energy Research Institute Daejeon 34057 Korea Department of Physics University of Ulsan Ulsan 44610 Korea

Magnetic damping is one of the most important parameters governing the critical current density for current-induced magnetization switching in spin-torque devices. The anisotropic nature of magnetic damping, influenced by both intrinsic and extrinsic factors, has been demonstrated in both theoretical and experimental studies. Nevertheless, understanding the underlying mechanisms of magnetic damping anisotropy, particularly in the bilayer structure of a ferromagnet and a nonmagnetic metal, remains an open challenge. In this study, we investigate the crystallographic dependence of magnetic damping in an epitaxial Cr/Fe bilayer, which has negligible magnetocrystalline anisotropy. We experimentally extracted the total damping by conducting frequency-dependent ferromagnetic resonance measurement at different in-plane angles. The observed damping reveals a strong angular dependence with an anisotropy of ∼400% in the bilayer. All possible contributions to the total damping will be discussed carefully to clarify the origin of the profound damping anisotropy observed in our Cr/Fe bilayer.

关键词： Magnetotransport Magnons Spin dynamics

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Liquid-phase sintering enabling mixed ionic-electronic interphases and free-standing composite cathode architecture toward high energy solid-state battery

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Nano Research 2022年第7期15卷 6156-6167页

作者： Xiang Han Weijun Zhou Minfeng Chen Linshan Luo Lanhui Gu Qiaobao Zhang Jizhang Chen Bo Liu Songyan Chen Wenqing Zhang College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037China Department of Physics Xiamen UniversityXiamen 361005China College of Mathematics and Physics Jinggangshan UniversityJi’an 343009China Department of Materials Science and Engineering College of MaterialsXiamen 361005China Department of Physics Southern University of Science and TechnologyShenzhen 518055China

Solid-state batteries(SSBs)will potentially offer increased energy density and,more importantly,improved safety for next generation lithium-ion(Li-ion)*** enabling technology is solid-state composite cathodes with high operating voltage and area *** composite cathode manufacturing technologies,however,suffer from large interfacial resistance and low active mass loading that with excessive amounts of polymer electrolytes and conductive ***,we report a liquidphase sintering technology that offers mixed ionic-electronic interphases and free-standing electrode architecture design,which eventually contribute to high area capacity.A small amount(~4 wt.%)of lithium hydroxide(LiOH)and boric acid(H_(3)BO_(3))with low melting point are utilized as sintering additives that infiltrate into single-crystal Ni-rich LiNi_(0.8)Mn_(0.1)Co_(0.1)(NMC811)particles at a moderately elevated temperature(~350℃)in a liquid state,which not only enable intimate physical contact but also promote the densification *** addition,the liquid-phase additives react and transform to ionic-conductive lithium boron oxide,together with the indium tin oxide(ITO)nanoparticle coating,mixed ionic-electronic interphases of composite cathode are successfully ***,the liquid-phase sintering performed at high-temperature(~800℃)also enables the fabrication of highly dense and thick composite cathodes with a novel free-standing *** promising performance characteristics of such composite cathodes,for example,delivering an area capacity above 8 mAh·cm^(−2) within a wide voltage window up to 4.4 V,open new opportunities for SSBs with a high energy density of 500 Wh·kg^(−1) for safer portable electronic and electrical transport.

关键词： solid-state battery single-crystal Ni-rich LiNi_(0.8)Mn_(0.1)Co_(0.1) liquid-phase sintering mixed ionic-electronic interphases freestanding architecture

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Electronic and thermal properties of Ag-doped single crystal zinc oxide via laser-induced technique

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Chinese physics B 2023年第6期32卷 44-51页

作者：邢欢王惠琼宋廷鲁李纯莉戴扬傅耿明康俊勇郑金成 Engineering Research Center of Micro-nano Optoelectronic Materials and Devices Ministry of EducationFujian Key Laboratory of Semiconductor Materials and ApplicationsCI Center for OSEDand Department of PhysicsXiamen UniversityXiamen 361005China Department of Physics and Department of New Energy Science and Engineering Xiamen University MalaysiaSepang 439000Malaysia Experimental Center of Advanced Materials School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China School of Material Science&Engineering Beijing Key Laboratory of Environmental Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Chemical Engineering School of Environmental and Chemical Engineeringand Institute for Sustainable EnergyShanghai UniversityShanghai 200444China

The doping of ZnO has attracted lots of attention because it is an important way to tune the properties of *** after growth is one of the efficient ***,we report a unique approach to successfully dope the single crystalline ZnO with Ag by the laser-induced method,which can effectively further post-treat grown *** sputtering was used to coat the Ag film with a thickness of about 50 nm on the single crystalline ***-doped yttrium aluminum garnet(Nd:YAG)laser was chosen to irradiate the Ag-capped ZnO samples,followed by annealing at700℃for two hours to form ZnO:*** three-dimensional(3D)information of the elemental distribution of Ag in ZnO was obtained through time-of-flight secondary ion mass spectrometry(TOF-SIMS).TOF-SIMS and core-level x-ray photoelectron spectroscopy(XPS)demonstrated that the Ag impurities could be effectively doped into single crystalline ZnO samples as deep as several hundred *** broadening of core level XPS profiles of Ag from the surface to depths of hundred nms was observed,indicating the variance of chemical state changes in laser-induced Ag-doped *** features of electronic mixing states were detected in the valence band XPS of ZnO:Ag,suggesting the strong coupling or interaction of Ag and ZnO in the sample rather than their simple *** Ag-doped ZnO also showed a narrower bandgap and a decrease in thermal diffusion coefficient compared to the pure ZnO,which would be beneficial to thermoelectric performance.

关键词： zinc oxide Ag-doping laser-induced technique XPS SIMS thermal diffusivity

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Recent advancements in thermal conductivity of magnesium alloys

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Journal of Magnesium and Alloys 2024年第5期12卷 1687-1708页

作者： Hao Lv Jun Tan Qian Yuan Fanglei Wang Yunxuan Zhou Quan Dong Aitao Tang Jürgen Eckert Bin Jiang Fusheng Pan National Engineering Research Center for Magnesium Alloys College of Materials Science and EngineeringChongqing UniversityChongqing 400044China National Key Laboratory of Advanced Casting Technologies Chongqing UniversityChongqing 400044China Department of Materials Science Chair of Materials PhysicsMontanuniversität LeobenJahnstraße 12Leoben A-8700Austria Erich Schmid Institute of Materials Science Austrian Academy of SciencesJahnstraße 12Leoben A-8700Austria

As highly integrated circuits continue to advance,accompanied by a growing demand for energy efficiency and weight reduction,materials are confronted with mounting challenges pertaining to thermal conductivity and lightweight *** virtue of numerous intrinsic mechanisms,as a result,the thermal conductivity and mechanical properties of the Mg alloys are often inversely related,which becomes a bottleneck limiting the application of Mg *** on several effective modification methods to improve the thermal conductivity of Mg alloys,this paper describes the law of how they affect the mechanical properties,and clearly indicates that peak aging treatment is one of the best ways to simultaneously enhance an alloy's thermal conductivity and mechanical *** the most frequently used Mg alloy,cast alloys exhibit substantial potential for achieving high thermal ***,recent reports indicate that hot deformation can significantly improve the mechanical properties while maintaining,and potentially slightly enhancing,the alloy's thermal *** presents a meaningful way to develop Mg alloys for applications in the field of small-volume heat dissipation components that require high *** comprehensive review begins by outlining standard testing and prediction methods,followed by the theoretical models used to predict thermal conductivity,and then explores the primary influencing factors affecting thermal *** review summarizes the current development status of Mg alloys,focusing on the quest for alloys that offer both high thermal conductivity and high *** concludes by providing insights into forthcoming prospects and challenges within this field.

关键词： Mg alloy Thermal conductivity Mechanical properties Solute atom Second phase

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Modulating oxygen vacancy concentration for selective growth of semiconducting single-walled carbon nanotubes with narrow diameters

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Journal of materials science & Technology 2024年第7期174卷 44-54页

作者： Lei Yang Tingkai Zhao Abdul Jalil Huijun Luo Tao Jiang Yuan Shu Yazhou Yin Weiyu Jia NPU-NCP Joint International Research Center on Advanced Nanomaterials&Defects Engineering Shaanxi Engineering Laboratory for Graphene New Carbon Materials and ApplicationsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Department of Physics Allama Iqbal Open University IslamabadPakistan

Semiconducting single-walled carbon nanotubes(s-SWCNTs)with narrow diameters are promising for future applications in many fields,especially in nanoelectronics and *** this study,the oxygen vacancy concentration modulating strategy was utilized for growing narrow diameters s-SWCNTs by the chemical vapor deposition(CVD)*** Fe_(0.01)Mg_(0.99)O solid solution based catalyst was syn-thesized to anchor the Fe particles and inhibit aggregation for growing SWCNTs with uniform ***_(2)was introduced into the catalyst to provide oxygen vacancies through H_(2)*** oxygen vacancies could form an oxidative environment during the growth of SWCNTs,and the chemically active metallic carbon nanotube caps are selectively etched away under this *** Fe/Ce molar ratio and H2 prereduction time were optimized to modulate the oxygen vacancy ***,us-ing the Fe_(0.01)Mg_(0.99)O/CeO_(2)(3)catalyst with 10 min of H_(2)prereduction time,high purity s-SWCNTs with diameters ranging from 1.41 to 1.71 nm and a content of 95.1%were obtained with high selectivity and carbon yield(1.33 wt%).The mechanism behind this phenomenon was elucidated through experimental characterizations and first-principle simulations,further expanding the understanding of the growth of s-SWCNTs through the modulation of oxygen vacancy concentration.

关键词： Semiconducting single-walled carbon nanotubes Oxygen vacancy concentration Fe_(0.01)Mg_(0.99)O/CeO_(2)catalyst

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