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Magnetoresistance anomaly in Fe_(5)GeTe_(2)homo-junctions induced by its intrinsic transition

Nano Research 2023年第7期16卷 10443-10450页

作者： Ruijie Zhao Yanfei Wu Shaohua Yan Xinjie Liu He Huang Yang Gao Mengyuan Zhu Jianxin Shen Shipeng Shen Weifeng Xu Zeyu Zhang Liyuan Zhang Jingyan Zhang Xinqi Zheng Hechang Lei Ying Zhang Shouguo Wang School of Materials Science and Engineering Beijing Advanced Innovation Center for Materials Genome EngineeringUniversity of Science and Technology BeijingBeijing 100083China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China School of Materials Science and Engineering Anhui UniversityHefei 230601China Institute of Advanced Materials Beijing Normal UniversityBeijing 100875China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China

Two-dimensional van der Waals(2D vdW)magnets have attracted great attention recently and possess the unprecedented advantages of incorporating high-quality vdW heterostructures and homostructures into spintronic devices,and exploring various physical phenomena or *** them,Fe_(5)GeTe_(2)(F5GT)has ferromagnetic order close to room temperature,however the magnetic properties near its intrinsic transitions and F5GT-based 2D devices remain mostly ***,we systematically demonstrate the peculiar magnetic properties of Fe_(5)GeTe_(2)nanoflakes near its intrinsic transition temperature(Tp)which is far lower than its Curie temperature(TC)of~265 K,and firstly discover anomalous magnetoresistance effect in F5GT homo-junctions by magneto-transport *** strongest anomalous Hall effect occurs around Tp which is located in a temperature range from 130 to 160 K for the F5GT nanoflakes with different ***,negative magnetoresistance(N-MR)and butterfly-shaped magnetoresistance(B-MR)are observed in F5GT homo-junction devices,and they appeared only in an intermediate temperature range from 110 to 160 K,noticeably showing the maxima near the T_(p)rather than the lowest *** experimental results clearly reveal the significant influence of intrinsic transitions on magnetic properties of F5GT and magnetoresistance effect in F5GT homo-junction devices,which imply a new strategy to achieve highperformance 2D spintronic devices by tuning intrinsic magnetic or structural transitions in 2D vdW magnets.

关键词： Two-dimensional(2D)van der Waals magnets Fe_(5)GeTe_(2) homo-junction magnetoresistance

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Selective deposition of a MOF at the spikes of Au nanostars for SERS detection

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Nano Research 2024年第10期17卷 9166-9173页

作者： Yi Liu Ka Kit Chui Xinyue Xia Han Zhang Xiaolu Zhuo Jianfang Wang School of Science and Engineering The Chinese University of Hong KongShenzhen 518172China Department of Physics The Chinese University of Hong KongShatinHong Kong 999077China School of Materials Science and Engineering Zhejiang Sci-Tech UniversityHangzhou 310000China

In the pursuit of advancing molecular sensing through surface-enhanced Raman spectroscopy(SERS),the combination of plasmonic nanoparticles and metal-organic frameworks(MOFs)has emerged as a highly effective approach to enhance the sensitivity and selectivity of SERS ***,most prior investigations have predominantly focused on MOF-coated plasmonic nanoparticles in core@shell or layer-by-layer configurations,leaving a notable knowledge gap in exploring alternative *** we present a facile method to construct a particle-on-mirror architecture by selectively coating a MOF,zeolitic imidazolate framework-8(ZIF-8),onto the tips of Au nanostars and subsequently depositing the resultant nanoparticles onto a Au *** design integrates the electric field enhancement at the sharp tips and nanogaps,along with the molecular enrichment function within the porous MOF immobilized at the tips and nanogaps,leading to a substantial boost in the SERS signal *** a unique SERS platform enables consistent and outstanding SERS performance for analytes of different *** work opens up a promising strategy for constructing multifunctional nanostructures for sensitive SERS detection in real-life scenarios.

关键词： electric field enhancement gold nanostars metal-organic frameworks molecular enrichment plasmon coupling surfaceenhanced Raman spectroscopy(SERS)substrates

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Multi-scale inhomogeneity and anomalous mechanical response of nanoscale metallic glass pillar by cryogenic thermal cycling

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Rare Metals 2024年第12期43卷 6771-6780页

作者： Xiao Liu Si-Yi Di Jing Zhou Fang Miao Hong-Ze Wang Yi Wu Hao-Wei Wang Hai-Bo Ke Qiang Li Xinjiang Key Laboratory of Solid State Physics and Devices Urumqi830046China School of Physics Science and Technology Xinjiang UniversityUrumqi830046China Songshan Lake Materials Laboratory Dongguan523808China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai200240China Department of Mechanical Engineering City University of Hong KongHong Kong999077China College of Materials Science and Engineering North University of ChinaTaiyuan030051China

The mechanical responses and structure variations of Ta_(80)Co_(20)nanoscale metallic glass(MG)film samples upon cryogenic thermal cycling(CTC)treatment were *** simultaneous improvements of strength and deformation ability bring about a super-high strength of 4.5 GPa and a large plastic strain of about 80%after CTC *** significant increase in inter-element bonding and hardness makes the activation and percolation of sheartransformation zones to be more difficult and delays theyielding event,leading to the ultra-high strength.

关键词： cycling cryogenic deformation

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A Practical Zinc Metal Anode Coating Strategy Utilizing Bulk h-BN and Improved Hydrogen Redox Kinetics

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Energy & Environmental materials 2025年第2期8卷 59-67页

作者： Dong Il Kim Hee Bin Jeong Jungmoon Lim Hyeong Seop Jeong Min Kyeong Kim Sangyeon Pak Sanghyo Lee Geon-Hyoung An Sang-Soo Chee Jin Pyo Hong Seung Nam Cha John Hong Department of Physics Research Institute for Natural ScienceHanyang UniversitySeoul 04763South Korea School of Materials Science and Engineering Kookmin UniversitySeoul 02707South Korea Department of Physics Sungkyunkwan University(SKKU)SuwonGyeonggi-do 16419South Korea School of Electronic and Electrical Engineering Hongik UniversitySeoul 04066South Korea Materials Science and Engineering Kumoh National Institute of TechnologyGumiGyeongsangbuk-do 39177South Korea Department of Energy Engineering Gyeongsang National UniversityJinjuGyeongnam-do 52725Korea Nano Convergence Materials Center Korea Institute of Ceramic Engineering and Technology(KICET)Jinju 52851Korea Division of Nano-Scale Semiconductor Engineering Hanyang UniversitySeoul 04763South Korea

Achieving high-performance aqueous zinc-ion batteries requires addressing the challenges associated with the stability of zinc metal anodes,particularly the formation of inhomogeneous zinc dendrites during cycling and unstable surface *** study introduces a practical method for scattering untreated bulk hexagonal boron nitride(h-BN)particles onto the zinc anode *** cycling,stabilized zinc fills the interstices of scattered h-BN,resulting in a more favorable(002)***,zinc dendrite formation is effectively suppressed,leading to improved electrochemical *** zinc with scattered h-BN in a symmetric cell configuration maintains stability 10 times longer than the bare zinc symmetric cell,lasting 500 ***,in a full cell configuration withα-MnO_(2) cathode,increased H^(+)ion activity can effectively alter the major redox kinetics of cycling due to the presence of scattered h-BN on the zinc *** shift in H^(+)ion activity lowers the overall redox potential,resulting in a discharge capacity retention of 96.1%for 300 cycles at a charge/discharge rate of 0.5 *** study highlights the crucial role of surface modification,and the innovative use of bulk h-BN provides a practical and effective solution for improving the performance and stability.

关键词： aqueous zincionbatteries H^(+)ion insertion hexagonalboronnitride scattering Znmetalanode

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Conformational Disorder Within the Crystalline Region of Silica-Filled Polydimethylsiloxane:A Solid-State NMR Study

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Chinese Journal of Polymer science 2024年第11期42卷 1780-1792,I0012页

作者： Yu-Qi Xiong Chang-Lin Li Ai Lu Liang-Bin Li Wei Chen National Synchrotron Radiation Laboratory Anhui Provincial Engineering Laboratory of Advanced Functional Polymer FilmCAS Key Laboratory of Soft Matter ChemistryUniversity of Science and Technology of ChinaHefei230026China Department of Accelerator Science and Engineering Physics School of Nuclear Science and TechnologyUniversity of Science and Technology of ChinaHefei230026China Institute of Chemical Materials China Academy of Engineering PhysicsMianyang621900China

The crystallization behavior of silica-filled polydimethylsiloxane(PDMS)was investigated in detail by^(1)H solid-state nuclear magnetic resonance(^(1)H SS-NMR)in combination with synchrotron radiation wide-angle X-ray scattering(WAXS),and temperature-modulated differential scanning calorimetry(TMDSC)*** neat PDMS,no apparent difference is observed for the crystallinity characterized by^(1)H SS-NMR and WAXS at low-temperature ***,upon filler addition,a 15%-35%lower difference in crystallinity is observed measured by^(1)H SS-NMR compared to *** origin of such mismatch was explored through multi-component structural,dynamics,and chain-order analysis of PDMS samples with different filler *** 1D integrated WAXS results of PDMS with different filler fractions at different temperatures show that the packing structure as well as crystal size basically remain unchanged,but as the filler fraction increases from 0 phr to 60 phr,the rigid component’s dynamics order parameter S_(r)obtained by^(1)H SS-NMR decreases from 0.70 to *** filler fraction-dependent crystallinity calculated based on S_(r)was compared with experimental values,revealing a behavior of decreasing order in the crystalline *** with the results of accelerated chain dynamics in crystalline region as reflected by T_(2)values,the molecular origin is attributed to the formation of CONDIS crystals,whose conformational order is lost but the position and orientation orders are *** hypothesis is further supported by the TMDSC results,where,as the filler fraction increases from 0 phr to 60 phr,the melting range widens from 8.77 K to 14.56 K,representing a growth of166%.In addition to previous reports related to the condition for forming CONDIS mesophase,i.e.,temperature,pressure,and stretching,the nano-sized filler could also introduce the local conformational disorder for chain packing.

关键词： Solid state NMR Polymer nanocomposite CONDIS crystal Local chain order PDMS crystallization

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Realizing High Thermoelectric Performance in n-Type Se-Free Bi_(2)Te_(3)materials by Spontaneous Incorporation of FeTe_(2)Nanoinclusions

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Energy & Environmental materials 2024年第4期7卷 344-354页

作者： Jamil Ur Rahman Woo Hyun Nam Yong-Jae Jung Jong Ho Won Jong-Min Oh Nguyen Van Du Gul Rahman Víctor M.García-Suárez Ran He Kornelius Nielsch Jung Young Cho Won-Seon Seo Jong Wook Roh Sang-il Kim Soonil Lee Kyu Hyoung Lee Hyun Sik Kim Weon Ho Shin Leibniz Institute for Solid State and Materials Research Dresden 01069Germany Advanced Materials Convergence R&D Division Korea Institute of Ceramic Engineering&TechnologyJinju 52861South Korea Department of Electronic Materials Engineering Kwangwoon UniversitySeoul 01897South Korea Department of Energy Engineering Dankook UniversityCheonan 31116South Korea Faculty of Fundamental Science Phenikaa UniversityHanoi 10000Vietnam Department of Physics Quaid-i-Azam UniversityIslamabad 45320Pakistan Departamento de FAısica Universidad de OviedoOviedo 33007Spain Nanomaterials and Nanotechnology Research Center-CINN El Entrego 33940Spain Department of Materials Science and Engineering Yonsei UniversitySeoul 03722South Korea School of Nano&Materials Science and Engineering Kyungpook National UniversitySangju 37224South Korea Department of Materials Science and Engineering University of SeoulSeoul 02504South Korea School of Materials Science and Engineering Changwon National UniversityChangwon 51140South Korea

Bi_(2)Te_(3)-based materials have drawn much attention from the thermoelectric community due to their excellent thermoelectric performance near room ***,the stability of existing n-type Bi_(2)(Te,Se)_(3)materials is still low due to the evaporation energy of Se(37.70 kJ mol^(-1))being much lower than that of Te(52.55 kJ mol^(-1)).The evaporated Se from the material causes problems in interconnects of the module while degrading the ***,we have developed a new approach for the high-performance and stable n-type Se-free Bi_(2)Te_(3)-based materials bymaximizing the electronic transport while suppressing the phonon transport,at the same *** generated FeTe_(2)nanoinclusions within the matrix during the melt-spinning and subsequent spark plasma sintering is the key to simultaneous engineering of the power factor and lattice thermal *** nanoinclusions change the fermi level of the matrix while intensifying the phonon scattering via *** a fine-tuning of the fermi level with Cu doping in the n-type Bi_(2)Te_(3)-0.02FeTe_(2),a high power factor of∼41×10^(-4)Wm^(-1)K^(-2)with an average zT of 1.01 at the temperature range 300-470 K are achieved,which are comparable to those obtained in n-type Bi_(2)(Te,Se)_(3)*** proposed approach enables the fabrication of high-performance n-type Bi_(2)Te_(3)-based materials without having to include volatile Se element,which guarantees the stability of the ***,widespread application of thermoelectric devices utilizing the n-type Bi_(2)Te_(3)-based materials will become possible.

关键词： Bi_(2)Te_(3) energy harvesting FeTe_(2) nanoinclusion n-type materials thermoelectric

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Perovskite LiBaH_(3) for photo-assisted dinitrogen fixation

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science China Chemistry 2025年第3期68卷 1169-1174页

作者： Kaixun Cui Yeqin Guan Yongli Cai Runze Wang Qianru Wang Wenbo Gao Jianping Guo Ping Chen Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023China Center of Materials and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Establishing supply chains for future ammonia energy systems requires the development of efficient materials and processes for ammonia production under mild *** researches disclose unique functionalities of binary alkali and alkaline earth metal hydrides in mediating ammonia *** to the rich compositional and structural properties of the metalhydrogen system,we herein report that LiBaH_(3),as a narrow band gap perovskite hydride,exhibits a strong response to visible light ***,hydridic hydrogen undergoes reductive elimination of producing H_(2)and creates an electron-rich *** an environment favors dinitrogen fixation to form N-H *** on this chemical property,a chemical looping ammonia synthesis process mediated by LiBaH_(3)and driven by both photo and thermal energies was proposed and *** work demonstrates that hydride perovskites are promising candidates for mediating photo-assisted nitrogen fixation reactions.

关键词： perovskite hydride photo-assisted ammonia synthesis chemical looping

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Unveiling the mechanism of non-conventional superconductivity through material genome engineering

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Frontiers of physics 2022年第3期17卷 7-8页

作者： X.-D.Xiang Department of materials science and engineering and department of physicssouthern university of science and technologyshenzhen 518055china

Studying the complexity of the electronic phase diagram is at the heart of understanding strongly correlated system in general,with high Tc superconductors as the most known *** temperature superconductivity has a wide range of application potentials in power transmission,nuclear magnetic resonance,magnetic levitation transportation,aerospace,information and communication technologies,*** its mechanism remains a long-standing challenge,due to its complex material structures and interlays among different phases such as charge density wave,antiferromagnetic and superconducting *** a result,this has greatly hindered its further development.

关键词： mechanism superconductivity magnetic

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Fullerene-derived boron-doped defective nanocarbon for highly selective H_(2)O_(2) electrosynthesis

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Nano Research 2024年第3期17卷 1217-1224页

作者： Wangqiang Shen Chang Zhang Muneerah Alomar Zhiling Du Zepeng Yang Junjie Wang Guangqing Xu Jian Zhang Jun Lv Xing Lu School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China School of Energy and Environmental Hebei University of EngineeringHandan 056038China School of Materials Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Department of Physics College of SciencesPrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh 11671Saudi Arabia

Electrochemical production of hydrogen peroxide(H_(2)O_(2))via the two-electron(2e-)pathway of oxygen reduction reaction(ORR)supplies an auspicious alternative to the current industrial anthraquinone ***,it still lacks efficient electrocatalysts to achieve high ORR activity together with 2e-selectivity ***,a boron-doped defective nanocarbon(B-DC)electrocatalyst is synthesized by using fullerene frameworks as the precursor and boric oxide as the boron *** obtained B-DC materials have a hierarchical porous structure,befitting boron dopants,and abundant topological pentagon defects,exhibiting a high ORR onset potential of 0.78 V and a dominated 2e-selectivity(over 95%).Remarkably,when B-DC electrocatalyst is employed in a real device,it achieves a high H_(2)O_(2) yield rate(247 mg·L^(-1)·h^(-1)),quantitative Faraday efficiency(~100%),and ultrafast organic pollutant degradation *** theoretical calculation reveals that the synergistic effect of topological pentagon defects and the incorporation of boron dopants promote the activation of the O_(2) molecule and facilitates the desorption of oxygen *** finding will be very helpful for the comprehension of the synergistic effect of topological defects and heteroatom dopants for boosting the electrocatalytic performance of nanocarbon toward H_(2)O_(2) production.

关键词： fullerene electrochemical hydrogen peroxide production oxygen reduction reaction carbon nanomaterials

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Insights into high electric-field-induced strain in BiAlO_(3)modified Bi_(1/2)Na_(1/2)TiO_(3)films

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Journal of Advanced Ceramics 2025年第3期14卷 29-38页

作者： Muhammad Sheeraz Sung Sik Won Jong Pil Kim Sabir Ali Fazli Akram Hyoung-Su Han Bong Chan Park Tae Heon Kim Ill Won Kim Aman Ullah Chang Won Ahn Department of Physics and Energy Harvest Storage Research Center(EHSRC) University of UlsanUlsan 44610Republic of Korea Research Center Kairos Co.Ltd.Suwon 16229Republic of Korea Busan Center Korea Basic Science InstituteBusan 46742Republic of Korea Department of Physics University of Science and TechnologyBannu 28100Pakistan Center for High Technology Materials and the Department of Mechanical Engineering The University of New MexicoAlbuquerque 87131USA School of Materials Science and Engineering University of UlsanUlsan 44776Republic of Korea Electronic Materials Research Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea

The development of high-strain piezoelectric materials has presented a longstanding challenge,particularly in the development of high-strain polycrystalline lead-free piezoelectric thin *** this work,we present a strategy for customizing the electrostrain in lead-free thin films through phase transition *** this study,we achieved a high recoverable electrostrain in a Bi_(1/2)Na_(1/2)TiO_(3)–BiAlO_(3)(BNT–BA)*** accomplish this,ferroelectric BNT and BNT–BA films with identical thicknesses of 500 nm were fabricated on Pt(111)/TiO_(2)/SiO_(2)/Si(100)substrates via a sol-gel *** with the BNT film,the BNT–BA film exhibited a greater polarization response and superior field strength endurance,maintaining the energy storage density beyond the breakdown field strength of the *** BNT–BA film demonstrated a large unipolar strain of S=0.43%with a normalized strain(maximum strain/maximum applied electric field(S_(max)/E_(max)))of 203 pm/V,followed by an effective transverse piezoelectric coefficient(e∗31,f)of~2.48 C/m^(2),which was more than two times greater than the value obtained for BNT(i.e.,maximum strain/maximum applied electric field(S_(max)/E_(max))=72 pm/V and e^(∗)_(31,f)of~1.09 C/m^(2)).This high strain response in the BNT–BA film can be attributed to the electric-field-induced phase transition of the mixed(i.e.,cubic and rhombohedral)phases into rhombohedral and tetragonal phases(mainly the rhombohedral structure),which recover back to the original state when the electric field is *** findings suggest new pathways for achieving significant strain levels via alternative mechanisms,potentially enhancing the effectiveness and expanding the applications of piezoelectric materials.

关键词： electrostrain piezoelectrics Bi_(1/2)Na_(1/2)TiO_(3)(BNT) BiAlO_(3)(BA) thin films phase transition

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