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Efficient UV emission from carbon dots derived from a green-tea extract

Nano Research 2025年第4期18卷 516-525页

作者： Henry Opoku Junkai Ren Xin Zhou Peijuan Zhang Shi Tang Dongfeng Dang Ludvig Edman Jia Wang Department of Physics UmeåUniversitySE-90187 UmeaSweden Department of Medical and Translational Biology UmeåUniversitySE-90187 UmeaSweden Engineering Research Center of Energy Storage Materials and Devices Ministry of EducationSchool of ChemistryXi’an Jiaotong UniversityXi’an 710049China Wallenberg Initiative Materials Science for Sustainability Department of PhysicsUmea UniversitySE-90187 UmeaSweden

Emissive carbon dots(CDs)that are synthesized from biomass can be highly sustainable,but the number of reported biomass-derived CDs that emit in the ultraviolet(UV)range is ***,current commercial UV-emitting materials rely heavily on the use of non-sustainable resources,such as rare metals,heavy metals,and petroleum *** yields that the development of efficient biomass-derived UVCDs is ***,we report on the hydrothermal conversion of a common green-tea extract(Polyphenon 60)into UV-CDs,which feature a photoluminescence(PL)peak wavelength of 384 nm,a full width at half maximum of 72 nm,and a photoluminescence quantum yield(PLQY)of 17% in *** shifting to a lower-polarity solvent of 3-phenoxyanisole,the PLQY is strongly enhanced to 81%,and the PL peak blue-shifts to 370 nm,while the maximum solubility is *** observations support the notion that the UV-CDs feature aggregation-induced emission and that they are endowed with hydrophilic surface ***,the findings of excitation-wavelength-independent PL and a nanosecond-level short emission lifetime reveal that it is a single distinct fluorophore that produces the UV *** finally report preliminary results that the UV-CDs exhibit potential for inhibiting the proliferation of cancer cells.

关键词： carbon dots ultraviolet(UV)emission biomass aggregation-induced-emission cell proliferation inhibitor

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High current limits in chemical vapor deposited graphene spintronic devices

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Nano Research 2023年第4期16卷 4233-4239页

作者： Daria Belotcerkovtceva J.Panda M.Ramu Tapati Sarkar Ulrich Noumbe M.Venkata Kamalakar Department of Physics and Astronomy Uppsala UniversityBox 516Uppsala SE-75120Sweden Department of Materials Science and Engineering Uppsala UniversityBox 35Uppsala SE-75103Sweden

Understanding the stability and current-carrying capacity of graphene spintronic devices is key to their applications in graphene channel-based spin current sensors,spin-torque oscillators,and potential spin-integrated ***,despite the demonstrated high current densities in exfoliated graphene,the current-carrying capacity of large-scale chemical vapor deposited(CVD)graphene is not ***,the grainy nature of chemical vapor deposited graphene and the presence of a tunnel barrier in CVD graphene spin devices pose questions about the stability of high current electrical spin *** this work,we observe that despite structural imperfections,CVD graphene sustains remarkably highest currents of 5.2×10^(8)A/cm^(2),up to two orders higher than previously reported values in multilayer CVD graphene,with the capacity primarily dependent upon the sheet resistance of ***,we notice a reversible regime,up to which CVD graphene can be operated without degradation with operating currents as high as 108 A/cm^(2),significantly high and durable over long time of operation with spin valve signals observed up to such high current *** the same time,the tunnel barrier resistance can be modified by the application of high *** results demonstrate the robustness of large-scale CVD graphene and bring fresh insights for engineering and harnessing pure spin currents for innovative device applications.

关键词： chemical vapor deposited(CVD)graphene high current density graphene spintronics spin integrated circuits graphene spin valve

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High-efficiency resistive switch and artificial synaptic simulation in antimony-based perovskite devices

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science China(Technological sciences) 2023年第4期66卷 1141-1151页

作者： LUO FeiFei WU YanZhao TONG JunWei XU DaKe QIN GaoWu TIAN FuBo ZHANG XianMin Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Department of Physics Freie Universitat Berlin14195 BerlinGermany State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China

Three kinds of Cs_(3)Sb_(2)X_(9)(X=I,Br,Cl)perovskite films have been prepared to fabricate the resistive memory devices with the structure of Al/Cs_(3)Sb_(2)X_(9)(X=I,Br,Cl)/indium tin oxide(ITO)*** devices exhibited a bipolar resistive switching behavior at room temperature by applying scanning voltage of 0→1→0→-1.8→0 *** switching voltages in the Al/Cs_(3)Sb_(2)X_(9)(X=I,Br,Cl)/ITO devices gradually decreased with the X from I,Br to Cl due to the different migration rates of halide vacancy in perovskite films,which is confirmed by the first-principles calculations of activation *** ON/OFF ratio under the reading voltage of 0.1 V significantly increased up to 100 in the Al/Cs_(3)Sb_(2)Cl_(9)/ITO device,which is nearly 10 and 3 times larger than that of the Al/Cs3Sb2I9/ITO device and the Al/Cs_(3)Sb_(2)Br_(9)/ITO device,*** endurance cycles and retention time of current devices were evaluated,showing the excellent electrical ***,the three kinds of Al/Cs_(3)Sb_(2)X_(9)(X=I,Br,Cl)/ITO device can successfully simulate the short-term plasticity of biological *** Al/Cs_(3)Sb_(2)Cl_(9)/ITO device showed the highest paired-pulsed facilitation index compared with that of other two devices,which was explored for the longterm plasticity and learning experience processes of *** addition,the Al/Cs_(3)Sb_(2)Cl_(9)/ITO device established associative learning behavior by simulating the Pavlov’s dog experiment.

关键词： perovskitefilms resistive switching artificial synapse

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Phonon-mediated third-harmonic generation in diamond

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Physical Review Applied 2024年第1期22卷 014066-014066页

作者： Jiaoyang Zheng Guru Khalsa Jeffrey Moses School of Applied and Engineering Physics Department of Materials Science and Engineering Department of Physics

We observe strongly anisotropic third-harmonic generation mediated by resonant sum-frequency driving of Raman-active phonons with terahertz light, extending light-induced dual control of structural and optical properties in solids. Either strong enhancement or strong suppression of the third harmonic can be achieved, covering six orders of magnitude, a result of interference between purely electronic and phonon-mediated contributions to the polarization field. These findings enrich capabilities for tailoring nonlinear optics via phononics and for the spectroscopy of crystalline structural dynamics.

关键词： Electron-phonon coupling High-order harmonic generation Lattice dynamics Stimulated Raman scattering Diamond Nonlinear optical materials High-harmonic generation Terahertz spectroscopy

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Determining the temperature of aluminum plasma produced by laser-induced breakdown spectroscopy based on its ultraviolet emission spectra (vol 65, pg 1229, 2023)

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 2023年第10期65卷 2857-2857页

作者： Wang, Xinhao Guo, Guqing Qiu, Xuanbing Gong, Ting He, Xiaohu Li, Chuanliang School of Materials Science and Engineering Taiyuan University of Science and Technology Taiyuan China Shanxi Engineering Research Center of Precision Measurement and Online Detection Equipment and Department of Physics Taiyuan University of Science and Technology Taiyuan China

Plasma temperature and electron density are two important parameters describing the characteristics of plasma. The Aluminum plasma is produced by laser-induced breakdown spectroscopy and its emission spectra are observed by a spectrometer with high resolution. Based on its discrete ultraviolet lines, pair-line Boltzmann (PLB) approach is proposed to determine the temperature of plasma. These pair-lines are with the same lower electronic state partially immune to self-absorption influence. For comparison with Boltzmann two-line method, the Al plasma is prepared at three different pulse energy levels. It is demonstrated that the accuracy of PLB is improved about three times by employing four ultraviolet pair-lines. The electron density is estimated at different excited energy according to Stark line broadening of Al I 396.15 nm. Furthermore, the alloy of 7075-Al is used as the sample target to generate the plasma to validate the PLB approach.

关键词： local thermal equilibrium pair-line Boltzmann approach plasma diagnostics temperature measurement ultraviolet emission spectroscopy

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Inelastic Deformation in Methylammonium Lead Iodide Perovskite and Mitigation by Additives during Thermal Cycling ( vol 9 , pg 2101 , 2024)

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ACS ENERGY LETTERS 2024年第7期9卷 3474-3474页

作者： Samoylov, Anton A. Dailey, Matthew Li, Yanan Lohr, Patrick J. Raglow, Sean Printz, Adam D. Department of Chemical and Environmental Engineering University of Arizona Tucson Arizona 85721 United States Department of Physics University of Arizona Tucson Arizona 85721 United States Department of Materials Science and Engineering University of Arizona Tucson Arizona 85721 United States

Metal halide perovskite thin films are promising materials for next-generation photovoltaic applications, but the thermomechanical instabilities of these materials are critical barriers to device longevity. In this study, we measure the evolution of stresses in methylammonium lead iodide (MAPbI3) films thermally cycled from 25 to 105 °C using a multibeam optical stress sensor (MOSS) system. We demonstrate that these films undergo residual stress buildup due to inelastic deformation as well as a simple mitigation strategy by incorporating low concentrations of 5-aminovaleric acid hydrochloride (5-AVACl) as an additive. Adding 5-AVACl increases the tensile stresses measured at room temperature but beneficially decreases the biaxial modulus from 9.60 ± 0.44 GPa to 7.95 ± 0.55 GPa, resulting in greater accommodation of thermal stresses. The hysteresis loop is ∼63% smaller with the inclusion of 5-AVACl, and the stress relaxation at 50 °C decreases from 86.46 to 51.49 MPa. The larger stress relaxation in pristine MAPbI3is correlated with grain boundary opening after five cycles, while the inclusion of 5-AVACl mitigates this degradation. Our findings underscore the importance of studying the dynamic response of perovskite films during thermal cycling and lay the foundation for further exploration into the mechanisms governing the thermomechanical behavior of perovskite thin films.

关键词： Deformation Hysteresis Perovskites Stress Thin films

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Rotational magnetoelectric switching in orthorhombic multiferroics

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npj Computational materials 2024年第1期10卷 2505-2511页

作者： Xu Li Hao Tian Lan Chen Hongjun Xiang Jun-Ming Liu L.Bellaiche Di Wu Yurong Yang National Laboratory of Solid State Microstructures and Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China Jiangsu Key Laboratory of Artificial Functional Materials Department of Materials Science and EngineeringNanjing UniversityNanjing 210093China School of Physics and Electronic Engineering Zhengzhou Normal UniversityZhengzhou 450044China School of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China Key Laboratory of Computational Physical Sciences(Ministry of Education) State Key Laboratory of Surface Physicsand Department of PhysicsFudan UniversityShanghai 200433China Physics Department and Institute for Nanoscience and Engineering University of ArkansasFayettevilleAR 72701USA

Controlling the direction of ferromagnetism and antiferromagnetism by an electric field in single-phase multiferroics will open the door to the next generation of devices for spintronics and *** typical magnetoelectric coupling such as the linear magnetoelectric effect is very weak in type-I multiferroics and therefore the magnetoelectric switching is rarely ***,using firstprinciples simulations,we propose a magnetoelectric switching mechanism to achieve such highly desired control in orthorhombic multiferroics.

关键词： orthorhombic magneto desired

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Frontiers in high entropy alloys and high entropy functional materials

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Rare Metals 2024年第10期43卷 4639-4776页

作者： Wen-Tao Zhang Xue-Qian Wang Feng-Qi Zhang Xiao-Ya Cui Bing-Bing Fan Jia-Ming Guo Zhi-Min Guo Rui Huang Wen Huang Xu-Bo Li Meng-Ru Li Yan Ma Zhi-Hua Shen Yong-Gang Sun De-Zhuang Wang Fei-Yang Wang Li-Qiang Wang Nan Wang Tian-Li Wang Wei Wang Xiao-Yang Wang Yi-Han Wang Fu-Jie Yu Yu-Zhen Yin Ling-Kun Zhang Yi Zhang Jian-Yang Zhang Qi Zhao Yu-Ping Zhao Xin-Dong Zhu Yasir Sohail Ya-Nan Chen Tao Feng Qi-Long Gao Hai-Yan He Yong-Jiang Huang Zeng-Bao Jiao Hua Ji Yao Jiang Qiang Li Xiao-Ming Li Wei-Bing Liao Huai-Jun Lin Hui Liu Qi Liu Qing-Feng Liu Wei-Di Liu Xiong-Jun Liu Yang Lu Yi-Ping Lu Wen Ma Xue-Fei Miao Jie Pan Qing Wang Hong-Hui Wu Yuan Wu Tao Yang Wei-Ming Yang Qian Yu Jin-Yu Zhang Zhi-Gang Chen Liang Mao Yang Ren Bao-Long Shen Xun-Li Wang Zhe Jia He Zhu Zhen-Duo Wu Si Lan School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China Jiangsu Key Laboratory for Advanced Metallic Materials School of Materials Science and EngineeringSoutheast UniversityNanjing 211189China Department of Physics City University of Hong KongHongKong 999077China School of Materials Science and Engineering Tianjin UniversityTianjin 300072China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China Department of Mechanical Engineering Research Institute for Advanced ManufacturingThe Hong Kong Polytechnic UniversityHong Kong 100872China Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Institute of Advanced Wear&Corrosion Resistance and Functional Materials Jinan UniversityGuangzhou 510632China School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou 221116China School of Physical Sciences Great Bay UniversityDongguan 523000China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China Beijing Advanced Innovation Center for Materials Genome Engineering Research Institute for Carbon NeutralityUniversity of Science and Technology BeijingBeijing 100083China Department of Mechanical Engineering The University of Hong KongHong Kong 999077China School of Computing Macquarie UniversitySydney 2113Australia Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China State Key Laborato

Owing to their exceptional properties,high-entropy alloys(HEAs)and high-entropy materials have emerged as promising research areas and shown diverse ***,the recent advances in the field are comprehensively reviewed,organized into five *** first section introduces the background of HEAs,covering their definition,significance,application prospects,basic properties,design principles,and *** subsequent section focuses on cutting-edge high-entropy structural materials,highlighting developments such as nanostructured alloys,grain boundary engineering,eutectic systems,cryogenic alloys,thin films,micro-nano-lattice structures,additive manufacturing,high entropy metallic glasses,nano-precipitate strengthened alloys,composition modulation,alloy fibers,and refractory *** the following section,the emphasis shifts to functional materials,exploring HEAs as catalysts,magneto-caloric materials,corrosion-resistant alloys,radiation-resistant alloys,hydrogen storage systems,and materials for ***,the review encompasses functional high-entropy materials outside the realm of alloys,including thermoelectric,quantum dots,nanooxide catalysts,energy storage materials,negative thermal expansion ceramics,and high-entropy wave absorption *** paper concludes with an outlook,discussing future directions and potential growth areas in the *** this comprehensive review,researchers,engineers,and scientists may gain valuable insights into the recent progress and opportunities for further exploration in the exciting domains of high-entropy alloys and functional materials.

关键词： High entropy alloys Cutting-edge structural materials Cutting-edgefunctional materials

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Eight-band k⋅p description and material gain for selected cubic and pseudocubic perovskites

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Physical Review Applied 2024年第1期22卷 014058-014058页

作者： Krzysztof Gawarecki Michał Wiśniewski Maciej Polak Robert Kudrawiec Marta Gładysiewicz Institute of Theoretical Physics Department of Experimental Physics Department of Materials Science and Engineering Department of Semiconductor Materials Engineering

In this work, we investigate optical properties of inorganic and organic metal halide perovskites (CsPbX3 and MAPbX3 with X={Cl,Br,I}). We use the eight-band k⋅p model to calculate the electronic band structures for perovskite materials of cubic and pseudocubic phase. In order to find respective parameters, the band structures of considered materials were obtained within state-of-the-art density-functional theory and used next as targets to adjust the k⋅p bands and determine the values of k⋅p parameters. The calculated band structures were used to obtain the material gain for bulk crystals (CsPbCl3, CsPbBr3, CsPbI3, MAPbCl3, MAPbBr3, and MAPbI3), which is compared with the material gain in well-established III-V semiconductors. It was found that for these perovskites a positive material gain appears at lower carrier density than for the reference materials (GaAs and InP). We demonstrate that from the point of view of the electronic band structure, the studied perovskites are very promising gain medium for lasers.

关键词： Gain properties of lasers Perovskites Density functional theory Group theory k dot p method

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Influence of thermal history on the crystallization behavior of high-Bs Fe-based amorphous alloys

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science China(physics,Mechanics & Astronomy) 2023年第5期66卷 173-180页

作者： Bowen Zang Lijian Song Richard Parsons Jie Shen Meng Gao Yan Zhang Juntao Huo Yonghao Sun Fushan Li Kiyonori Suzuki Jun-Qiang Wang Weihua Wang CAS Key Laboratory of Magnetic Materials and Devices and Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Department of Materials Science and Engineering Monash UniversityClayton VIC 3800Australia Institute of Physics Chinese Academy of SciencesBeijing 100190China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

A crucial step in creating cutting-edge soft magnetic alloys is the nanocrystallization of Fe-based amorphous ***,it is unclear how the thermal history affects the *** this work,high-precision nanocalorimetry and in-situ hightemperature transmission electron microscopy are used to systematically examine how the pre-annealing relaxation process affects the nanocrystallization of Fe-based amorphous *** discover that the glass with more thermal energy storage will crystallize into superb nanocrystalline structures with exceptionally advanced soft *** soft magnetic properties of Fe-B nanocrystalline alloys can be improved by increasing the relaxation *** finding provides solid and clear evidence for the influences of thermal history on crystallization behavior for Fe-based amorphous alloys,which is helpful for designing advanced soft magnetic nanocrystalline alloys.

关键词： amorphous alloys enthalpy relaxation nanocrystallization microstructure development soft magnetic properties

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