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science China materials 2020年第10期63卷 2062-2070页

作者： Jun Zhang Wuhong Xue Tiancong Su Huihui Ji Zhi Yan Guowei Zhou Zhiyong Quan Xiaohong Xu School of Chemistry and materials science of shanxi normal university&key laboratory of magnetic molecules and magnetic information materials of ministry of education Linfen 041004China Department of Chemistry&Chemical Engineering Lvliang UniversityLvliang 033001China research institute of materials science of shanxi normal university&Collaborative Innovation Center for shanxi Advanced Permanent magnetic materials and Techonology Linfen 041004China

Rare-earth orthoferrite SmFeO3 is an outstanding single-phase multiferroic material,holding great potential in novel low-power electronic ***,simultaneous magnetic and ferroelectric orders as well as magnetoelectric(ME)coupling effect at room temperature(RT)in this system have not been demonstrated *** this study,epitaxial SmFeO3 films were successfully prepared onto tensile-strain Nb-SrTiO3(Nb-STO)substrates by a pulsed laser deposition(PLD)*** results show that the films exhibit obvious ferromagnetic and ferroelectric orders at ***,the magnetic anisotropy gradually changes from out-of-plane(OP)to in-plane(IP)direction with increasing film thickness,which is attributed to the variations of O 2p-Fe 3d hybridization intensity and Fe 3d-orbit occupancy caused by the strain-relaxed ***,electrically driven reversible magnetic switching further proves that the SmFeO3 films exhibit the RT ME coupling effect,suggesting promising applications in new-generation electric-write magnetic-read data storage devices.

关键词： SmFeO3 film multiferroicity magnetoelectric coupling magnetic anisotropy

Intrinsic exchange bias effect in strain-engineered single antiferromagnetic LaMnO3 films

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science China materials 2019年第7期62卷 1046-1052页

作者： Guowei Zhou Huihui Ji Yuhao Bai Zhiyong Quan Xiaohong Xu School of Chemistry and materials science Key Laboratory of Magnetic Molecules and Magnetic Information Materials Ministry of Education Shanxi Normal University Linfen 041004 China research institute of materials science of shanxi normal university & Collaborative Innovation Center for shanxi Advanced Permanent magnetic materials and Techonology Linfen 041004 China School of Physics and Electronic information Shanxi Normal University Linfen 041004 China

In this work, epitaxial growth of LaMnO3 thin films on different substrates using pulsed laser deposition under tensile and compressive strain was studied. The intrinsic exchange bias effect was observed in the single A-type antiferromagnetic LaMnO3 films no matter whether the tensile or compressive strain was supplied by the substrates. Due to the lattice mismatch between the film and different substrates, the intense strain can induce MnO6 octahedral rotation in the bottom region of the film neighboring the substrate, which leads to the distortion of MnO6 octahedron and the net magnetic behavior. However, the upper part maintains the original A-type antiferromagnetic order due to strain relaxation. The exchange bias effect in single films is attributed to the coupling between the bottom canted magnetic part and the upper antiferromagnetic region. The observation of exchange bias in single films on different substrates enables the emergence of a new class of biasing components in spintronics, which are based on strain-engineering.

关键词： magnetic insulating state exchange bias Mn06 octahedral rotation strain and interface effects magnetic properties

Interfacial engineering manipulation of magnetic anisotropy evolution via orbital reconstruction in low-dimensional manganite superlattices

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science China materials 2022年第7期65卷 1902-1911页

作者： Guowei Zhou Huihui Ji Zhi Yan Miming Cai Penghua Kang Jun Zhang Jingdi Lu Jinxing Zhang Jingsheng Chen Xiaohong Xu School of Chemistry and materials science of shanxi normal university&key laboratory of magnetic molecules and magnetic information materials of ministry of education Linfen 041004China research institute of materials science of shanxi normal university&Collaborative Innovation Center for shanxi Advanced Permanent magnetic materials and Technology Linfen 041004China Department of materials science and Engineering National University of SingaporeSingapore 117575Singapore Department of Physics Beijing Normal UniversityBeijing 100875China

Control of magnetic anisotropy in low-dimensional systems is of paramount importance in terms of their fundamental and technological ***_(0.7)Sr_(0.3)MnO_(3)(LSMO)is a ferromagnetic half-metal with a high Curie temperature and many efforts have been made to control its magnetic ***,the relationship between the evolution of the magnetic anisotropy orientation and the electronic structure of low-dimensional LSMO still remains poorly ***,the high-quality superlattices comprised of LSMO and SrMnO_(3)(SMO)layers are synthesized with a compatible structure at the atomic *** magnetic anisotropy is gradually varied from planar to perpendicular by increasing the SMO thickness,and the special fourfold magnetic anisotropy is also observed at the intermediate superlattice *** evolution of the magnetic anisotropy in these systems is confirmed by the electronic transport and magnetic ***,X-ray linear dichroism measurements and first-principles calculations reveal the interfacial orbital reconstruction with the in-plane to out-ofplane magnetic reorientation ***,a new microscopic method for magnetic anisotropy manipulation is developed in the present study,enabling discovery of novel phenomena as well as control of the magnetic properties.

关键词： perpendicular magnetic anisotropy magnetic measurement transport measurement interfacial engineering orbital reconstruction

General strategy for evaluating the d-band center shift and ethanol oxidation reaction pathway towards Pt-based electrocatalysts

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science China Chemistry 2023年第1期66卷 279-288页

作者： Jin-Hong Zheng Guang Li Jun-Ming Zhang Ningyan Cheng Li-Fei Ji Jian Yang Jialin Zhang Bin-Wei Zhang Yan-Xia Jiang Shi-Gang Sun State key laboratory of Physical Chemistry of Solid Surfaces Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China School of Chemistry and Chemical Engineering Chongqing UniversityChongqing 401331China Center of Advanced Energy Technology and Electrochemistry Institute of Advanced Interdisciplinary StudiesChongqing UniversityChongqing 400044China key laboratory of magnetic molecules&magnetic information materials ministry of education School of Chemical and Material ScienceShanxi Normal UniversityTaiyuan 030031China information materials and Intelligent Sensing laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationInstitutes of Physical Science and Information TechnologyAnhui UniversityHefei 230039China

The catalytic performance of Pt-based catalysts depends sensitively on their d-band ***,there are still huge challenges to evaluate their d-band centers from experimental technologies,and modulate them to analyze their selectivity in ethanol oxidation reaction(EOR).Here,Pt1Au1alloy supported on the commercial carbon material(Pt_(1)Au_(1)/C)is employed as a typical example to investigate its d-band center shift of surface Pt,and as electrocatalysts to study its selectivity towards ***,a highly reliable in situ Fourier-transform infrared spectroscopy CO-probe strategy is developed to characterize the d-band center shift of surface *** modified electronic effect and site effect of Pt_(1)Au_(1)/C dictated the adsorption configuration of intermediate species and the OH species coverage,thereby influencing its *** importantly,we developed a universal cyclic voltammetry peak differentiation fitting method as an electrochemical analysis technique to investigate CO_(2)selectivity,which is potentially extendable to other Pt-based electrocatalysts.

关键词： PtAu in situ FTIRS d-band center ethanol oxidation reaction CV peak differentiation fitting method

Enhanced coalescence separation of oil-in-water emulsions using electrospun PVDF nanofibers

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Chinese Journal of Chemical Engineering 2021年第10期34卷 76-83页

作者： Yujie Yang Lei Li Qian Zhang Wenwen Chen Song Lin Zaiqian Wang Wangliang Li CAS key laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China key laboratory of magnetic molecules&magnetic information materials ministry of education The School of Chemical and Material ScienceShanxi Normal UniversityLinfen 041004China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China Guizhou Water Fuquan Co. LtdGuiyang 550081China

A novel and high-efficiency coalescence membrane enhanced by nano-sized polyvinylidene fluoride(PVDF)nanofibers based on polyester(PET)substrate was fabricated using electrospinning *** properties of the electrospun nanofibers such as roughness and surface morphology greatly affected the oil droplet interception efficiency and surface wettability of the membrane.A series of coalescence units were prepared with different layers of nanofibrous membrane and the separation efficiencies at different initial concentrations,flow rates,and oil types were *** is very interesting that the obtained nanofibrous membrane exhibited superoleophilicity in air but poor oleophilicity under water,which was beneficial to the coalescence *** coalescence unit with four membrane layers had excellent performances under different initial concentrations and flow *** separation efficiency of the 4-layers unit remained above 98.2%when the initial concentration reached up to 2000 mg·***,the unit also exhibited good performance with the increasing oil density and viscosity,which is promising for large-scale oil wastewater treatment.

关键词： Coalescence Electrospinning Nanofibrous membrane Oil-in-water emulsions

Mn3O4 nanoparticles@reduced graphene oxide composite:An efficient electrocatalyst for artificial N2 fixation to NH3 at ambient conditions

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Nano research 2019年第5期12卷 1093-1098页

作者： Hong Huang Feng Gong Yuan Wang Huanbo Wang Xiufeng Wu Wenbo Lu Runbo Zhao Hongyu Chen Xifeng Shi Abdullah M.Asiri Tingshuai Li Qian Liu Xuping Sun institute of Fundamental and Frontier sciences University of Electronic Science and Technology of ChinaChengdu 610054China School of Environment and Resource Southwest University of Science and TechnologyMianyang 621010China School of materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China key laboratory of magnetic molecules and magnetic information materials (ministry of education) School of Chemistry and Material ScienceShanxi Normal UniversityLinfen 041004China College of Chemistry Chemical Engineering and Materials ScienceShandong Normal UniversityJinan 250014China Chemistry Department Faculty of Science & Center of Excellence for Advanced Materials ResearchKing Abdulaziz UniversityP.O.Box 80203Jeddah 21589Saudi Arabia

Currently,industrial-scale NH3 production almost relies on energy-intensive Haber-Bosch process from atmospheric N2 with large amount of CO2 emission,while low-cost and high-efficient catalysts are demanded for the N2 reduction reaction (NRR).In this study,Mn3O4 nanoparticles@reduced graphene oxide (Mn3O4@rGO) composite is reported as an efficient NRR electrocatalyst with excellent selectivity for NH3 *** 0.1 M Na2SO4 solution,such catalyst obtains a NH3 yield of 17.4 μg·h^-1·mg^-*** a Faradaic efficiency of 3.52% at-0.85 V *** hydrogen ***,it also shows high electrochemical stability during electrolysis *** functional theory (DFT) calculations also demonstrate that the (112) planes of Mn3O4 possess superior NRR activity.

关键词： Mn3O4@rGO composite electrocatalyst NH3synthesis N2reduction reactionam bient conditions

CN bond orientation in metal carbonitride endofullerenes：A density functional theory study

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Chinese Physics B 2017年第12期26卷 210-215页

作者：张竹霞张勇薛文华贾伟张彩丽李春霞崔鹏 key laboratory of Interface science and Engineering in Advanced materials of ministry of education Taiyuan University of Technology Taiyuan 030024 China research Center of Advanced materials science and Technology Taiyuan University of Technology Taiyuan 030024 China Collaborative Innovation Center for shanxi Advanced Permanent magnetic materials and Technology Linfen 041004 China School of Electronic information Engineering Yangtze Normal University Chongqing 408100 China School of information Guizhou University of Finance and Economics Guiyang 550025 China

The geometric and electronic structures of scandium carbonitride endofullerene Sc3CN@C2n （2n=68, 78, 80, 82, and 84） and Sc（Y）NC@C76 have been systematically investigated to identify the preferred position of internal C and N atoms by density functional theory （DFT） calculations combined with statistical mechanics treatments. The CN bond orientation can generally be inferred from the molecule stability and electronic configuration. It is found that Sc3CN@C2n molecules have the most stable structure with C atom locating at the center of Sc3CN cluster. The CN bond has trivalent form of[CN]3- and connects with adjacent three Sc atoms tightly. However, in Sc（Y）NC@C76 with[NC]-, the N atom always resides in the center of the whole molecule. In addition, the stability of Sc3CN@C2n has been further compared in terms of the organization of the corresponding molecular energy level. The structural differences between Sc3CN@C2n and Sc3NC@C2n are highlighted by their respected infrared spectra.

关键词： geometric and electronic structures metal carbonitride endofullerenes theoretical calculations CN bond orientation

Epitaxial growth ofβ-Ga_(2)O_(3)thin films on Ga_(2)O_(3)and Al_(2)O_(3)substrates by using pulsed laser deposition

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Journal of Advanced Dielectrics 2019年第4期9卷 47-53页

作者： Yuxin An Liyan Dai Ying Wu Biao Wu Yanfei Zhao Tong Liu Hui Hao Zhengcheng Li Gang Niu Jinping Zhang Zhiyong Quan Sunan Dingy key laboratory of magnetic molecules and magnetic information materials of ministry of education School of Chemistry and materials science shanxi normal university Linfen 041004P.R.China Vacuum Interconnected Nanotech Workstation(Nano-X)Suzhou institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of sciences(CAS) Suzhou 215123P.R.China Electronic materials research laboratory key laboratory of the ministry of education&International Center for Dielectric research School of Electronic and Information Xi’an Jiaotong UniversityXi’an 710049P.R.China

In this work,we have successfully grown high quality epitaxialβ-Ga_(2)O_(3)thin films onβ-Ga_(2)O_(3)(100)and Al_(2)O_(3)(0001)substrates using pulsed laser deposition(PLD).By optimizing temperature and oxygen pressure,the best conditions were found to be 650-700℃and 0.5 *** further improve the quality of hetero-epitaxialβ-Ga_(2)O_(3),the sapphire substrates were pretreated for atomic terraced surface by chemical cleaning and high temperature *** the optical transmittance measurements,the films grown at 600-750℃exhibit a clear absorption edge at deep ultraviolet region around 250-275 nm *** resolution transmission electron microscope(HRTEM)images and X-ray diffraction(XRD)patterns demonstrate thatβ-Ga_(2)O_(3)(-201)//Al_(2)O_(3)(0001)epitaxial texture dominated the epitaxial oxide films on sapphire substrate,which opens up the possibilities of high power electric devices.

关键词： Oxide semiconductor β-Ga_(2)O_(3)epitaxy optical transmission spectrum pulsed laser deposition crystal growth

Spin Transport Properties of MnBi_(2)Te_(4)-Based magnetic Tunnel Junctions

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Chinese Physics Letters 2023年第8期40卷 80-85页

作者：董新龙贾鑫严志申学敏李泽宇乔振华许小红 College of Physics and information Engineering Shanxi Normal UniversityTaiyuan 030031China key laboratory of magnetic molecules and magnetic information materials of the ministry of education Research Institute of Materials ScienceShanxi Normal UniversityTaiyuan 030031China International Center for Quantum Design of Functional materials University of Science and Technology of ChinaHefei 230026China Hefei National laboratory University of Science and Technology of ChinaHefei 230088China

The van der Waals heterojunctions,stacking of different two-dimensional materials,have opened unprecedented opportunities to explore new physics and device ***,combining the density functional theory with non-equilibrium Green’s function technique,we systematically investigate the spin-polarized transport properties of van der Waals magnetic tunnel junctions(MTJs),Cu/MnBi_(2)Te_(4)/MnBi_(2)Te_(4)/Cu and Cu/MnBi_(2)Te_(4)/hBN/n·MnBi_(2)Te_(4)/Cu(n=1,2,3).It is found that the maximum tunnel magnetoresistance of Cu/MnBi_(2)Te_(4)/hBN/3·MnBi_(2)Te_(4)/Cu MTJs can reach 162.6%,exceeding the system with only a single layer MnBi_(2)Te_(4).More interestingly,our results indicate that Cu/MnBi_(2)Te_(4)/h-BN/n·MnBi_(2)Te_(4)/Cu(n=2,3)MTJs can realize the switching function,while Cu/MnBi_(2)Te_(4)/h-BN/3·MnBi_(2)Te_(4)/Cu MTJs exhibit the negative differential *** Cu/MnBi_(2)Te_(4)/h-BN/3·MnBi_(2)Te_(4)/Cu in the parallel state shows a spin injection efficiency of more than 83.3%.Our theoretical findings of the transport properties will shed light on the possible experimental studies of MnBi_(2)Te_(4)-based van der Waals magnetic tunneling junctions.

关键词： exceeding equilibrium

Recent progress on two-dimensional ferroelectrics:Material systems and device applications

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Chinese Physics B 2023年第12期32卷 40-53页

作者：范芷薇渠靖媛王涛温滟安子文姜琦涛薛武红周鹏许小红 key laboratory of magnetic molecules and magnetic information materials of ministry of education and School of Chemistry and materials science Shanxi Normal UniversityTaiyuan 030031China State key laboratory of ASIC&System School of MicroelectronicsFudan UniversityShanghai 200433China

Ferroelectrics are a type of material with a polar structure and their polarization direction can be inverted reversibly by applying an electric *** have attracted tremendous attention for their extensive applications in non-volatile memory,sensors and neuromorphic ***,conventional ferroelectric materials face insulating and interfacial issues in the commercialization *** contrast,two-dimensional(2D)ferroelectric materials usually have excellent semiconductor performance,clean van der Waals interfaces and robust ferroelectric order in atom-thick layers,and hold greater promise for constructing multifunctional ferroelectric optoelectronic devices and nondestructive ultra-high-density ***,2D ferroelectrics have obtained impressive breakthroughs,showing overwhelming ***,firstly,the progress of experimental research on 2D ferroelectric materials is ***,the preparation of 2D ferroelectric devices and their applications are ***,the future development trend of 2D ferroelectrics is looked at.

关键词： two-dimensional materials ferroelectrics device applications