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The effect of room temperature magnetic field on photoluminescence of Mn:CsPbBr_(3) quantum dots prepared by one-pot method in air

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Nano Research 2025年第4期18卷 561-568页

作者： Mengwei Chen Chenguang Shen Wei Huang Yingping Yang Jie Shen Department of Physics School of Physics and MechanicsWuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China

The generation and manipulation of spin-polarized electrons at room temperature are essential for the development of advanced spin-optoelectronic *** this work,a one-pot method was used to successfully synthesize homogenous Mn:CsPbBr_(3) perovskite quantum dots in air with particle sizes of 7−8 *** effects of Mn doping on the structure,optical and magnetic properties of CsPbBr_(3) quantum dots were *** findings demonstrated proper Mn doping improved the crystallinity and photoluminescence(PL)of quantum *** prepared quantum dots have a narrow full width at half maximum emission(FWHM)of about 17−20 *** magnetic properties of the doped samples and the effect of the magnetic field on the PL spectra properties were *** results show that trace Mn doping can improve the room-temperature ferromagnetism of CsPbBr_(3) quantum *** with magnetic elements makes CsPbBr_(3) quantum dots more responsive to the applied magnetic *** at a lower 50 mT magnetic field,the PL peak of Mn:CsPbBr_(3) still declined 5.91%.Mn:CsPbBr_(3) quantum dots are a new type of multifunctional material that is beneficial to spintronics *** work demonstrates a low-cost synthesis *** should make all-inorganic perovskite quantum dots a promising material for room-temperature spin optoelectronic devices.

关键词： CsPbBr_(3)quantum dots Mn doping one-pot method ferromagnetism magnetic field

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Microstructure and magnetocaloric properties of melt-extracted SmGdDyCoAl high-entropy amorphous microwires

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Rare Metals 2024年第3期43卷 1234-1242页

作者： Shi-Jie Wei Hong-Xian Shen Lun-Yong Zhang Lin Luo Xin-Xing Tang Jian-Fei Sun Xiao-Qing Li School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China Applied Materials Physics Department of Materials Science and EngineeringKTH-Royal Institute of Technology10044StockholmSweden

This paper presents a systematic investigation of the microstructure and magnetocaloric properties of melt-extracted Sm_(20)Gd_(20)Dy_(20)Co_(20)Al_(20)high-entropy *** fabricated wires exhibited an amorphous structure,and the temperature interval of the undercooled liquid AT was 45 *** microwires underwent a second-order magnetic transition from a ferromagnetic to a paramagnetic state near the Curie temperature(T_(C)=52 K),The maximum magnetic entropy change(-ΔS_M^(max)),the relative cooling power and the refrigeration capacity reached 6.34 J·kg^(-1)·K^(-1).422.09 J·kg^(-1)and 332.94 J·kg^(-1),respectively,under a magnetic field change of 5 *** addition,the temperature-averaged entropy changes with two temperature lifts(3 and 10 K)were 6.32 and 6.27 J·kg^(-1)·K^(-1),*** good magnetocalorie performance highlights the significant potential for the Sm_(20)Gd_(20)Dy_(20)Co_(20)Al_(20)microwires to be used as magnetic refrigerant materials in low-temperature region *** work will serve as a valuable reference for future investigations on low-temperature high-entropy magnetocaloric materials.

关键词： Melt-extraction High-entropy amorphous microwires Magnetocaloric effect Magnetic refrigeration

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Low-temperature-pyrolysis preparation of nanostructured graphite towards rapid potassium storage with high initial Coulombic efficiency

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Nano Research 2024年第6期17卷 5138-5147页

作者： Jingke Ren Boyu Xing Wen Luo Binyang Luo Xinfei Wu Xin Yan Wencong Feng Feiyue Wang Chaojie Cheng Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Physics School of ScienceWuhan University of TechnologyWuhan 430070China

Industrially prepared artificial graphite(AG)is attractive for potassium-ion batteries(PIBs),but its rate performance is poor and the production process is energy intensive,so developing an efficient strategy to produce novel graphite with low energy consumption and high performance is economically ***,a nanostructured graphite composed of multi-walled carbon nanotubes(MWCNTs)and graphite shells was prepared by one-pot method through low-temperature pyrolysis of iron-based metal-organic framework(MOF)and carbon *** high graphitization degree of nanostructured graphite makes the initial Coulombic efficiency(ICE)exceed 80%,and the three-dimensional(3D)conductive network ensures a specific capacity of 234 mAh·g^(−1)after 1000 cycles at a high current density of 500 mA·g^(−1).In addition,the typical graphite potassium storage mechanism is also demonstrated by in situ X-ray diffraction(XRD)and in situ Raman spectroscopy,and its practicality is also proved by the voltage of the full *** work provides a feasible way to optimize the practical production process of AG and expand its application in energy storage.

关键词： graphite anode potassium-ion batteries high graphitization degree low-temperature pyrolysis initial Coulombic efficiency

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Quantum spin systems: Toroidal classification and geometric duality

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Physical Review B 2024年第14期110卷 L140403页

作者： Vahid Azimi-Mousolou Anders Bergman Anna Delin Olle Eriksson Manuel Pereiro Danny Thonig Erik Sjöqvist Department of Applied Mathematics and Computer Science Faculty of Mathematics and Statistics Department of Physics and Astronomy Department of Applied Physics School of Engineering Sciences (SeRC) Wallenberg Initiative Materials Science for Sustainability (WISE) Wallenberg Initiative Materials Science WISE School of Science and Technology

We demonstrate a toroidal classification for quantum spin systems, revealing an intrinsic geometric duality within this structure. Through our classification and duality, we reveal that various bipartite quantum features in magnon systems can manifest equivalently in both bipartite ferromagnetic and antiferromagnetic materials, based upon the availability of relevant Hamiltonian parameters. Additionally, the results highlight the antiferromagnetic regime as an ultrafast dual counterpart to the ferromagnetic regime, both exhibiting identical capabilities for quantum spintronics and technological applications. Concrete illustrations are provided, demonstrating how splitting and squeezing types of two-mode magnon quantum correlations can be realized across ferro- and antiferromagnetic regimes.

关键词： Magnons Quantum correlations in quantum information Quantum information processing Quantum information theory Spintronics

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Unveiling spin magnetic effect of TM doped SnS_(2) nanosheet with enhanced hydrogen evolution reaction

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Journal of Energy Chemistry 2024年第12期99卷 636-644页

作者： Ruixin Xu Tianzhao Lin Shiqian Cao Tingting Bo Yanyu Liu Wei Zhou Department of Applied Physics Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing TechnologySchool of ScienceTianjin UniversityTianjin 300072China College of Physics and Materials Science Tianjin Normal UniversityTianjin 300387China

Photoelectrochemical hydrogen evolution reaction(HER)is taken into account as an alternative to effective hydrogen production,emphasizing the importance of *** magnetism of catalysts could modulate the adsorption of the H atom and further enhance the HER ***,doping the double transition metal atoms on SnS_(2) nanosheet(TM_(2)@SnS_(2))to form the efficient magnetic catalyst is proposed to explore the spin magnetic effect on the HER *** performing first-principles calculations,nonmagnetic V_(2)@SnS_(2) is proved to be the candidate of the HER catalyst;nevertheless,the HER activities of antiferromagnetic and ferromagnetic V_(2)@SnS_(2) are relatively inferior due to the spin-induced charge ***,machine learning analysis shows the absolute importance of the electronic structure of TM dopants and surrounding S ligands,and the HER activity could be predicted by the modified band centers of S-3p_(z) and ***,the proof-of-concept experiment has substantiated the above theoretical predictions by significantly increasing liner sweep voltammetry and photocurrent with applied magnetic *** work provides a new avenue for uncovering the spin catalytic mechanism and the exploration and design of efficient HER catalysts.

关键词： Density functional theory Hydrogen evolution reaction Tin sulfide Transition metal doping Machine learning

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Dynamic mode decomposition of nonequilibrium electron-phonon dynamics:accelerating the firstprinciples real-time Boltzmann equation

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npj Computational materials 2024年第1期10卷 1970-1977页

作者： Ivan Maliyov Jia Yin Jia Yao Chao Yang Marco Bernardi Department of Applied Physics and Materials Science California Institute of TechnologyPasadenaCA 91125USA Applied Mathematics and Computational Research Division Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA Department of Physics California Institute of TechnologyPasadenaCA 91125USA

Nonequilibrium dynamics governed by electron–phonon(e-ph)interactions plays a key role in electronic devices and spectroscopies and is central to understanding electronic excitations in *** real-time Boltzmann transport equation(rt-BTE)with collision processes computed from first principles can describe the coupled dynamics of electrons and atomic vibrations(phonons).Yet,a bottleneck of these simulations is the calculation of e–ph scattering integrals on dense momentum grids at each time *** we show a data-driven approach based on dynamic mode decomposition(DMD)that can accelerate the time propagation of the rt-BTE and identify dominant electronic *** apply this approach to two case studies,high-field charge transport and ultrafast excited electron *** both cases,simulating only a short time window of~10%of the dynamics suffices to predict the dynamics from initial excitation to steady state using DMD *** of the momentum-space modes extracted from DMD sheds light on the microscopic mechanisms governing electron relaxation to a steady state or *** combination of accuracy and efficiency makes our DMD-based method a valuable tool for investigating ultrafast dynamics in a wide range of materials.

关键词： materials dynamics phonon

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Effect of Structural Configu ations on Mechanical and Shape Recovery Properties of Ni Ti Triply Periodic Minimal Surface Porous Structures

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Chinese Journal of Mechanical Engineering 2024年第6期37卷 303-319页

作者： Shuaishuai Wei Bo Song Lei Zhang Xiaobo Wang Junxiang Fan Zhi Zhang Yusheng Shi State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Institute of Materials China Academy of Engineering PhysicsMianyang 621907China Department of Mechanical Engineering City University of Hong KongKowloon 999077China

Based on the advantages of triply periodic minimal surface(TPMS)porous structures,extensive research on NiTi shape memory alloy TPMS scaffolds has been ***,the current reports about TPMS porous structures highly rely on the implicit equation,which limited the design *** this work,novel shell-based TPMS structures were designed and fabricated by laser powder bed *** comparisons of manufacturability,mechanical properties,and shape recovery responses between traditional solid-based and novel shell-based TPMS structures were *** indicated that the shell-based TPMS porous structures possessed larger Young's moduli and higher compressive ***,Diamond shell structure possessed the highest Young's moduli of 605.8±24.5MPa,while Gyroid shell structure possessed the highest compressive strength of 43.90±3.32 *** addition,because of the larger specific surface area,higher critical stress to induce martensite transformation,and lower austenite finish temperature,the Diamond shell porous structure exhibited much higher shape recovery performance(only 0.1%residual strain left at pre-strains of 6%)than other porous *** results substantially uncover the effects of structural topology on the mechanical properties and shape recovery responses of NiTi shape memory alloy scaffolds,and confirm the effectiveness of this novel structural design *** research can provide guidance for the structural design application of NiTi porous scaffolds in bone implants.

关键词： NiTi shape memory alloy Porous structure Laser powder bed fusion Mechanical property Shape recovery property

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Intermediate polaronic charge transport in organic crystals from a many-body first-principles approach

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npj Computational materials 2022年第1期8卷 630-637页

作者： Benjamin K.Chang Jin-Jian Zhou Nien-En Lee Marco Bernardi Department of Applied Physics and Materials Science California Institute of TechnologyPasadenaCA91125USA

Charge transport in organic molecular crystals (OMCs) is conventionally categorized into two limiting regimes − band transport,characterized by weak electron-phonon (e-ph) interactions,and charge hopping due to localized polarons formed by strong e-ph ***,between these two limiting cases there is a less well understood intermediate regime where polarons are present but transport does not occur via *** we show a many-body first-principles approach that can accurately predict the carrier mobility in this intermediate regime and shed light on its microscopic *** approach combines a finite-temperature cumulant method to describe strong e-ph interactions with Green-Kubo transport *** apply this parameter-free framework to naphthalene crystal,demonstrating electron mobility predictions within a factor of 1.5−2 of experiment between 100 and 300 *** analysis reveals the formation of a broad polaron satellite peak in the electron spectral function and the failure of the Boltzmann equation in the intermediate regime.

关键词： polaron charge limiting

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Bolstering functionality in multilayer and bilayer WS2 via focused laser micro-engraving

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Science China(Information Sciences) 2023年第6期66卷 94-101页

作者： Si Min CHAN Eng Tuan POH Jin Feng LEONG Kuan Eng Johnson GOH Chorng Haur SOW Department of Physics National University of Singapore Institute of Materials Research and Engineering Agency for ScienceTechnology and Research (A~*STAR) Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological University

Laser thinning of multilayer transition metal dichalcogenide(TMD)crystals has long been explored for its potential to produce localized domains of optically functional monolayers. Despite the high spatial control and resolution of the laser, the range of appropriate applications for these laser-thinned domains is still limited by the peripheral regions of unaltered thick multilayers. Herein, we report a newfound property of the laser-thinned regions to adhere strongly to the underlying substrate when lasered down to the monolayer limit. Upon a brief sonication in various solvents, the surrounding pristine multilayers can be lifted off, solely leaving behind the post-lasered monolayer patterns. Coupled with the flexible maneuver of the laser, various monolayer designs can be achieved, including micro-antenna, waveguide, and electrode geometries with lateral line widths at 1.5 μm resolution. Furthermore, we also detail the optical properties of the monolayers obtained from laser thinning, with those acquired from multilayers containing more defectbound excitons, whereas those lasered from bilayers presenting a trion-dominated profile similar to as-grown monolayers. Together, these findings allow for faster and more efficient multilayer removal and areal shaping of optically active monolayer domains, in comparison to multistep and complex standard lithographic etching(lithography–etch–develop)procedures.

关键词： WS$_2$ monolayer micro-patterning focused laser sonication lift-off

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Enhancement of osteogenic potential and surface wettability of polycaprolactone using hydroxyapatite co-doped with vanadium and yttrium

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Ceramics International 2025年第15期51卷 20575-20594页

作者： Megha, M. Joy, Anjumol Mohan, Chandni C. Unnikrishnan, Gayathri Thomas, Jibu Haris, M. Bhatt, Sarita G. Kolanthai, Elayaraja Muthuswamy, Senthilkumar Department of Physics Karunya Institute of Technology and Sciences Coimbatore India College of Engineering Abu Dhabi University Abu Dhabi United Arab Emirates Department of Biotechnology Cochin University of Science and Technology Kochi India Department of Biotechnology Karunya Institute of Technology and Sciences Coimbatore India Department of Applied Physics School of Arts and Natural Sciences Joy University Tirunelveli India Department of Materials Sciences and Engineering Advanced Materials Processing and Analysis Centre University of Central Florida OrlandoFL United States

Although advanced composites are becoming more common in therapeutic applications, there is still a significant need for materials that combine improved mechanical properties with biological functionality for successful bone tissue engineering. This study aimed to develop a novel polymeric nanocomposite by incorporating vanadium and yttrium co-doped hydroxyapatite (HVY) into a polycaprolactone (PCL) matrix using the solvent casting method. For the first time, rare-earth metal yttrium was co-doped with vanadium to enhance the mechanical and biological performance of polymer composites for bone tissue engineering. The incorporation of HVY significantly improved mechanical strength from 26.30 ± 0.37 MPa to 48.58 ± 0.42 MPa, while enhancing surface hydrophilicity, as evidenced by a reduction in the contact angle from 102.98° to 62.16°. Porosity and degradation studies over 21 days demonstrated a satisfactory and controlled degradation rate suitable for bone regeneration applications. Biomineralization capacity was confirmed through the deposition of calcium and phosphate on the composite surface after immersion in simulated body fluid (SBF). Antibacterial tests revealed potent activity against S. aureus and P. aeruginosa, with inhibition zones of 9.05 ± 0.8 mm and 7.15 ± 0.6 mm, respectively. Hemocompatibility testing indicated a hemolysis rate of less than 5 %, while over 80 % viability of rat bone marrow-derived stromal cells (rBMSC) confirmed the non-toxic nature of the composites. Osteogenic differentiation assays, including ALP and ARS, showed outstanding performance, suggesting the significant potential of the prepared material for promoting bone development and regeneration. This study bridges a critical gap in the development of biomaterials by introducing a rare-earth metal co-doping strategy, providing a promising biomaterial for bone tissue engineering applications. The findings underscore its potential as a highly effective, easily fabricated biomaterial tha

关键词： Yttrium

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