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Preferred orientation induced high efficiency dehydrogenation of metal hydrides

Journal of Materials Science & technology 2026年 241卷 238-244页

作者： Qinke Tang Mengran Li Yunfeng Zhu Jiaxiang Xu Xingyue Fang Jiangchuan Liu Jialing Gu Rui Shi Yao Zhang Jiguang Zhang Yana Liu Xiaohui Hu Jun Wang College of Materials Science and Engineering Jiangsu Collaborative Innovation Centre for Advanced Inorganic Function Composites Nanjing Tech University Nanjing 211816 China School of Materials Science and Engineering Jiangsu Key Laboratory of Materials Surface Science and Technology CNPC-CZU Innovation Alliance Changzhou University Changzhou 213164 China School of Materials Science and Engineering Southeast University Nanjing 211189 China

Magnesium nickel hydrides are regarded as advanced metal hydride functional materials in hydrogen storage, while it is hard to improve their dehydrogenation kinetics and ensure the air-exposure stability at the same time. Herein, a novel and efficient method was developed to prepare highly active and antioxidative bulk magnesium nickel hydrides by quenching. Differential scanning calorimetry (DSC) test shows that quenching at 280 °C can decrease the dehydrogenation peak temperature of Mg 2 NiH 4 from ∼345 °C to ∼260 °C. The quenched Mg 2 NiH 4 can dehydrogenate completely at 230 °C within only 250 s and at 215 °C within 1000 s, respectively. Interestingly, an obvious preferred orientation of (420) diffraction index of Mg 2 NiH 4 was found after quenching treatment, which is positively correlated with the free energy of hydrogen desorption, as indicated by ab-initio simulation, thus improving the dehydrogenation performance greatly. Moreover, the quenched sample also exhibits a stable air-exposure performance. There is even a slight decrease in the dehydrogenation peak temperature after air exposure for 7 days. The results provide a novel insight into the design of bulk magnesium nickel hydrides with high activity and the analysis of the corresponding dehydrogenation mechanism.

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Controllable growth of type-II Dirac semimetal PtTe2 atomic layer on Au substrate for sensitive room temperature terahertz photodetection

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InfoMat 2021年第6期3卷 705-715页

作者： Yang Yang Kaixuan Zhang Libo Zhang Guo Hong Chao Chen Hongmei Jing Jiangbo Lu Peng Wang Xiaoshuang Chen Lin Wang Hua Xu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'anChina State Key Laboratory for Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghaiChina Department of Optoelectronic Science and Engineering Donghua UniversityShanghaiChina Department of Physics and Chemistry Faculty of Science and TechnologyInstitute of Applied Physics and Materials EngineeringUniversity of MacaoMacaoChina School of Physics and Information Technology Shaanxi Normal UniversityXi'anChina

Platinum telluride(PtTe_(2)),a member of metallic transition metal dichalcogenides,provides a new platform for investigating various properties such as type-II Dirac fermions,topological superconductivity,and wide-band ***,the study of PtTe_(2)is largely limited to exfoliated flakes,and its direct synthesis remains ***,we report the controllable synthesis of highly crystalline 2D PtTe_(2)crystals with tunable morphology and thickness via chemical vapor deposition(CVD)growth on Au *** adjusting Te amount and substrate temperature,anisotropic and isotropic growth modes of PtTe_(2)were realized on the solid and molten Au substrates,*** domain size of PtTe_(2)crystal was achieved up to 30μm,and its thickness can be tuned from 5.6 to 50 nm via controlling the growth ***,a metal–PtTe_(2)–metal structural device was fabricated to validate the wide-band terahertz(THz)photodetection from 0.04 to 0.3 THz at room *** to the high crystallinity of PtTe_(2)crystal,the photodetector acquires high responsivity(30–250 mA W-1 from 0.12 to 0.3 THz),fast response rate(rise time:7μs,decay time:8μs),and high-quality imaging *** work demonstrates the feasibility for realistic exploitation of high-performing photodetection system at THz band based on the CVDgrown 2D Dirac semimetal materials.

关键词： 2D materials chemical vapor deposition Dirac semimetal platinum telluride terahertz photodetection

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Inch-size Cs3Bi2I9 polycrystalline wafers with near-intrinsic properties for ultralow-detection-limit X-ray detection

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Journal of Materials Chemistry C 2022年第17期10卷 6665-6672页

作者： Nuo Bu Shanshan Jia Yingrui Xiao Haojin Li Nan Li Xinmei Liu Zhou Yang Kui Zhao Shengzhong (Frank) Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi’an 710119 China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

Lead-free perovskites are promising for next-generation bio-friendly X-ray detector materials, while it remains a challenge to fabricate high-quality wafers at a macroscopic scale using a readily scalable method. Herein, a solvent-free mechanochemical fabrication method is developed to produce inch-size lead-free perovskite Cs₃Bi₂I₉ crystalline-wafers. It is surprising to see that these polycrystalline wafers exhibit near-intrinsic properties, and more specifically, the apparent trap density is measured to be as low as 5.26 × 10⁻¹⁰ cm⁻³, essentially the same as that of their single-crystal counterparts. Therefore, the X-ray detector fabricated on the Cs₃Bi₂I₉ wafer delivers high sensitivity up to 230.46 ± 19.86 μC Gy_air⁻¹ cm⁻² and a detection limit as low as 61.25 nGy_air s⁻¹ under a 40 kV X-ray source and 40 V mm⁻¹ electric field. This research provides a readily scalable method for fabricating large perovskite wafers with near-intrinsic properties for general commercial applications.

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Controllable preparation and microwave absorption properties of shape anisotropic Fe_(3)O_(4) nanobelts

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Journal of Materiomics 2021年第5期7卷 957-966页

作者： Jialiang Pan Rujing Zhang Jun Ling Min Wang Zechen Li Zhen Zhen Limin He Hongwei Zhu State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China The First Scientific Research Institute of Wuxi Wuxi214035JiangsuChina Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material AECC Beijing Institute of Aeronautical MaterialsBeijing100095China

To substantially prevent electromagnetic threatens,microwave absorbing materials(MAMs)are required to eliminate surplus electromagnetic *** a typical MAM,Fe_(3)O_(4) particles with complex permittivity and permeability have been widely applied due to the coexistence of magnetic loss and dielectric ***,the necessary high mass fraction significantly limited its applications,thus Fe_(3)O_(4) nanostructures have been extensively investigated to overcome this *** this work,uniform Fe_(3)O_(4) nanobelts were prepared by electrospinning and two-step thermal *** controlling the composition and viscosity of the electrospinning precursor solution,Fe_(3)O_(4) nanobelts with tunable lateral sizes(200 nme1 mm)were *** samples with low content(only 16.7 wt%)Fe_(3)O_(4) exhibited wide maximum effective absorbing bandwidths(EAB)over 3 GHz,and Fe_(3)O_(4) nanobelts with smaller lateral sizes showed a maximum EAB of 4.93 ***,Fe_(3)O_(4) nanobelts with smaller lateral sizes presented superior reflection loss properties,the lowest reflection loss reached-53.93 dB at 10.10 GHz,while the maximum EAB was up to 2.98 *** excellent microwave reflection loss of Fe_(3)O_(4) nanobelts was contributed to the enhanced synergistic effect of magnetic loss,dielectric loss,and impedance matching,originated from the hierarchically cross-linked networks and shape *** study could broaden the practical applications of magnetic absorbers,and provided an approach for the development of shape anisotropic magnetic materials.

关键词： Fe_(3)O_(4) Nanobelts Shape anisotropy Microwave absorption Reflection loss

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Angle-resolved magneto-chiral anisotropy in a non-centrosymmetric atomic layer superlattice

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Science Bulletin 2025年第9期70卷 1406-1409页

作者： Long Cheng Mingrui Bao Xue Zhang Jingxian Zhang Qun Yang Qiang Li Hui Cao Dawei Qiu Hui Li Guanglei Cheng Hua Zhou Jian-Min Zuo Xiaodong Zhou Jian Shen Zhifeng Zhu Wenbo Wang Xiaofang Zhai School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China School of Information Science and Technology ShanghaiTech UniversityShanghai 201210China State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing Fudan UniversityShanghai 200433China X-ray Science Division Advanced Photon SourceArgonne National LaboratoryLemontIL 60439USA Institutes of Physical Science and Information Technology Anhui UniversityHefei 230601China Department of Materials Science and Engineering and Materials Research Laboratory University of Illinois Urbana–ChampaignUrbanaIL 61801USA ShanghaiTech Laboratory for Topological Physics ShanghaiTech UniversityShanghai 201210China

Chirality is a widespread phenomenon in nature,where two non-superimposable enantiomers exist with one being the mirror image of the *** interplay between chirality and magnetism has recently drawn intensive interest in non-centrosymmetric magnetic materials absent of both spatial and time inversion symmetries[1].Among various chiral magnetic effects,the electrical manifestation of the magneto-chiral effect is crucial for both fundamental science and technological applications[2,3].The non-reciprocal resistance depending on the inner product of the magnetic field(H)and the current density U),termed the electrical magneto-chiral effect(eMChE),has recently been demonstrated in correlated oxides[4,5].

关键词： chiral magnetic effectsthe non reciprocal resistance EMCHE magnetism correlated oxides non centrosymmetric atomic layer superlattice chirality electrical magneto chiral effect

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Topological thermal transport

arXiv

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arXiv 2024年

作者： Liu, Zhoufei Jin, Peng Lei, Min Wang, Chengmeng Marchesoni, Fabio Jiang, Jian-Hua Huang, Jiping Department of Physics State Key Laboratory of Surface Physics Fudan University Shanghai200438 China MOE Key Laboratory of Advanced Micro-Structured Materials Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology School of Physics Science and Engineering Tongji University Shanghai200092 China Department of Physics University of Camerino Camerino62032 Italy Suzhou Institute for Advanced Research University of Science and Technology of China Jiangsu Suzhou215123 China Fudan University Shanghai200438 China

Thermal transport is a fundamental mechanism of energy transfer process quite distinct from wave propagation phenomena. It can be manipulated well beyond the possibilities offered by natural materials with a new generation of artificial metamaterials: thermal metamaterials. Topological physics, a focal point in contemporary condensed matter physics, is closely intertwined with thermal metamaterials in recent years. Inspired by topological photonics and topological acoustics in wave metamaterials, a new research field emerged recently, which we dub 'topological thermotics', which encompasses three primary branches: topological thermal conduction, convection, and radiation. For topological thermal conduction, we discuss recent advances in both 1D and higher-dimensional thermal topological phases. For topological thermal convection, we discuss the implementation of thermal exceptional points with their unique properties and non-Hermitian thermal topological states. Finally, we review the most recent demonstration of topological effects in the near-field and far-field radiation. Anticipating future developments, we conclude by discussing potential directions of topological thermotics, including the expansion into other diffusion processes such as particle dynamics and plasma physics, and the integration with machine learning techniques. © 2024, CC BY.

关键词： Radiation effects

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Nature of spin-lattice coupling in two-dimensional CrI_(3) and CrGeTe_(3)

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Science China(Physics,Mechanics & Astronomy) 2021年第8期64卷 63-71页

作者： Jing Li JunSheng Feng PanShuo Wang ErJun Kan HongJun Xiang Key Laboratory of Computational Physical Sciences(Ministry of Education) State Key Laboratory of Surface Physicsand Department of PhysicsFudan UniversityShanghai 200433China Shanghai Qi Zhi Institute Shanghai 200232China School of Physics and Materials Engineering Hefei Normal UniversityHefei 230601China Department of Applied Physics and Institution of Energy and Microstructure Nanjing University of Science and TechnologyNanjing 210094China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

Spin-lattice (SL) coupling plays an important role in spintronic applications given its effects on magnetic,ferroelectric,optical,and thermodynamic *** and theoretical calculations have revealed a large SL coupling effect in CrGeTe_(3) and CrI_(3) ***,the microscopic origin of SL coupling in these systems is still *** this work,we develop a systematic method to explore the atomistic mechanism of SL coupling based on the density functional *** find that the first-and second-order SL couplings in ternary system CrGeTe_(3) are considerably stronger than those in binary system CrI_(3).For the first-order SL coupling,the Cr ions of the magnetic pair and Ge ions positively contribute to the strain enhancement of ferromagnetism in CrGeTe_(3).However,the Cr ions provide a negative contribution in CrI_(3).Furthermore,our tight-binding analysis suggests that the p-d hopping in CrGeTe_(3) gradually decreases with the tensile strain,rapidly enhancing the ferromagnetism under the tensile *** large frequency shifts in CrGeTe_(3) are caused by the large second-order exchange derivatives (one type of second-order SL coupling) of the Cr ions of the magnetic pair.

关键词： spin-lattice effect two-dimensional magnetic materials first-principle calculation

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Valley Polarization and Anomalous Valley Hall Effect in Altermagnet Ti2Se2S with Multipiezo Properties

arXiv

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arXiv 2025年

作者： Hu, Xin Zhao, Weihang Xia, Wenjun Sun, Hanbo Wu, Chao Wu, Yin-Zhong Li, Ping State Key Laboratory for Mechanical Behavior of Materials Center for Spintronics and Quantum System School of Materials Science and Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China School of Physical Science and Technology Suzhou University of Science and Technology Suzhou215009 China State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang University Hangzhou310027 China State Key Laboratory for Surface Physics Department of Physics Fudan University Shanghai200433 China

Recently, altermagnets demonstrate numerous newfangle physical phenomena due to their inherent antiferromagnetic coupling and spontaneous spin splitting, that are anticipated to enable innovative spintronic devices. However, the rare two-dimensional altermagnets have been reported, making it difficult to meet the requirements for high-performance spintronic devices on account of the growth big data. Here, we predict a stable monolayer Ti2Se2S with out-of-plane altermagnetic ground state and giant valley splitting. The electronic properties of altermagnet Ti2Se2S are highly dependent on the onsite electron correlation. Through symmetry analysis, we find that the valleys of X and Y points are protected by the mirror Mxy symmetry rather than the time-reversal symmetry. Therefore, the multipiezo effect, including piezovalley and piezomagnetism, can be induced by the uniaxial strain. The total valley splitting of monolayer Ti2Se2S can be as high as ∼500 meV. Most interestingly, the direction of valley polarization can be effectively tuned by the uniaxial strain, based on this, we have defined logical "0", "+1", and "-1" states for data transmission and storage. In addition, we have designed a schematic diagram for observing the anomalous Hall effect in experimentally. Our findings have enriched the candidate materials of two-dimensional altermagnet for the ultra-fast and low power consumption device applications. © 2025, CC BY.

关键词： Titanium dioxide

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Eco-Driving Optimization Method for Heterogeneous CAVs at an Isolated Unsignalized Intersection

Eco-Driving Optimization Method for Heterogeneous CAVs at an...

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IEEE International Conference on Unmanned Systems (ICUS)

作者： Jianjun Cai Yonggang Liu Wenwei Que Yuanjian Zhang Zheng Chen State Key Laboratory of Mechanical Transmissions Chongqing University Chongqing China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha China Department of Aeronautical and Automotive Engineering Loughborough University Loughborough United Kingdom Faculty of Transportation Engineering Kunming University of Science and Technology Kunming China

This paper presents an eco-driving optimization method for heterogeneous connected autonomous vehicles (CAVs) of mixed electric vehicles (EVs) and traditional fuel vehicles (FVs) at an isolated unsignalized intersection. An optimization method is designed to compute the arrival time of each vehicle in the heterogeneous vehicle fleet. Furthermore, we use quadratic programming to optimize the speed trajectory for EVs and the Gauss Pseudospectral method for FVs. Then, an eco-driving optimization method based on a rolling optimization framework that combines the time schedule algorithm and trajectory optimization method is proposed. We make a comparative study with the dynamic programming algorithm and simulation results show that our method outperforms the baselines, where the average energy consumption of EVs and FVs has been reduced by 0.09% and 0.14%, respectively.

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Topology reconstruction for asymmetric systems by isomorphic mapping or perturbation approximation

arXiv

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arXiv 2024年

作者： Li, Yunlin Chen, Jingguang Qi, Xingchao Xiong, Langlang Wang, Xianjun Liu, Yufu Guan, Fang Shi, Lei Jiang, Xunya Department of Illuminating Engineering and Light Sources School of Information Science and Engineering Fudan University Shanghai200433 China Engineering Research Center of Advanced Lighting Technology Fudan University Ministry of Education Shanghai200433 China State Key Laboratory of Surface Physics Key Laboratory of Micro- and Nano-Photonic Structures Ministry of Education Department of Physics Fudan University Shanghai200433 China Institute of Future Lighting Academy for Engineering and Technology Fudan University Shanghai200433 China

The systems without symmetries, e.g. the internal or spatial symmetry, are generally thought to be improper for topological study and no conventional integral topological invariant can be well defined. In this work, with multi-band asymmetric Rice-Mele-like systems as examples, we show that the topology of all gaps can be reconstructed by two general methods and a new integral topological invariant, i.e. the renormalized real-space winding number, can properly characterize the topology of such systems. For the first method, an isomorphic mapping relationship between a Rice-Mele-like system and its chiral counterpart is constructed, which accounts for the topology reconstruction at half-filling gaps. For the second method, the Hilbert space of asymmetric systems could be reduced into degenerate subspaces by perturbation approximation, so that the topology in subspaces accounts for the topology reconstruction at fractional-filling gaps. The perturbation-based topology exhibits extraordinary robustness since it even exists beyond the weak perturbation limit. We also show that both methods can be widely used for other asymmetric systems, e.g. the two-dimensional (2D) Rice-Mele systems and the superconductor systems. At last, for the asymmetric photonic systems, we predict different topological edge states by our topology-reconstruction theory and experimentally observe them in the laboratory, which agrees with each other very well. Our findings open a door for investigating new topological phenomena in asymmetric systems by various topological reconstruction methods which should greatly expand the category of topology study. Copyright © 2024, The Authors. All rights reserved.

关键词： Topology

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