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Uncovering the magnetic response of open-shell graphene nanostructures on metallic surfaces at different doping levels

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Science China(Physics,Mechanics & Astronomy) 2024年第2期67卷 142-148页

作者： Zengfu Ou Jun Wang Jihai Zhang Yukang Ding Shenwei Chen Wenya Zhai Jingcheng Li Dingyong Zhong Donghui Guo School of Physics Sun Yat-sen UniversityGuangzhou 510275China Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices School of PhysicsSun Yat-sen UniversityGuangzhou 510275China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen UniversityGuangzhou 510275China College of Chemical Engineering Zhejiang University of TechnologyHangzhou 310014China

Open-shell graphene nanostructures(GNs)are promising candidates for future spintronics and quantum *** progress based on on-surface synthetic approach has successfully created such GNs on metallic ***,the doping effect of metallic surfaces is inevitably present and can significantly tune their electronic and magnetic ***,we investigate the zigzag end states of open-shell 7-armchair graphene nanoribbons(7-AGNRs)on Au(111),Au(100)and Ag(111)*** with the manipulation of a scanning tunneling microscope,we demonstrate that the end states can be tuned from empty states to singly occupied states and to doubly occupied states by substrate ***,the singly occupied states can be finely tuned,with the occupancy number of the states and related magnetic behaviors uncovered by experiments at different temperatures and magnetic *** results provide a comprehensive study of the magnetic response of open-shell GNs on metallic surfaces at different doping levels.

关键词： open-shell graphene nanostructures magnetic response metallic substrate doping Kondo resonance scanning tunneling microscopy/spectroscopy

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Enhancing ferromagnetic coupling in CrXY(X=O,S,Se;Y=Cl,Br,I)monolayers by turning the covalent character of Cr-X bonds

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npj Computational Materials 2023年第1期9卷 1781-1786页

作者： Hao-Ran Zhu Bin Shao Xu Zuo College of Electronic Information and Optical Engineering Nankai UniversityTianjinChina Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai UniversityTianjinChina Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Nankai UniversityTianjinChina Engineering Research Center of Thin Film Optoelectronics Technology Ministry of EducationNankai UniversityTianjinChina

On the basis of first-principles calculations,we investigate the electronic and magnetic properties of 1T phase chromium sulfide halide CrXY(X=O,S,Se;Y=Cl,Br,I)monolayers in CrCl_(2) structure with the P3m1 space *** for the CrOI monolayer,all CrXY monolayers are stable and ferromagnetic *** results show that the ferromagnetic coupling is dominated by the kinetic exchange between the empty e_(g)-orbital of Cr atoms and the p-orbital of anions under the three-fold rotational *** this context,the coupling strength allows for being greatly enhanced by turning the nature of Cr–X bonds,i.e.,increasing the covalent contribution of the bonds by minimizing the energy difference of the coupled *** we illustrate for the example of CrOY,the Curie temperature(T_(c))is nearly tripled by substituting O by S/Se ion,eventually reaching the highest Tc in CrSeI monolayer(334 K).The high stabilities and Curie temperature manifest these monolayer ferromagnetic materials feasible for synthesis and applicable to 2D spintronic devices.

关键词： ferromagnetic bonds coupling

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Enhanced cycle stability of aprotic Li-O_(2) batteries based on a self-defensed redox mediator

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Chinese Chemical Letters 2024年第3期35卷 449-452页

作者： Guiru Sun Yan Wang Daming Yang Zexu Zhang Wei Lu Ming Feng Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education Jilin Normal UniversityChangchun 130103China College of Information Technology Jilin Engineering Research Center of Optoelectronic Materials and DevicesJilin Normal UniversitySiping 136000China

LiBr as a promising redox mediator(RM)has been applied in Li-O_(2)batteries to improve oxygen evolution reaction kinetics and reduce ***,the redox shuttle of Br_(3)^-can induce the unexpected reactions and thus cause the degradation of LiBr and the corrosion of Li anode,resulting in the poor cyclability and the low round-trip ***,MgBr_(2)is firstly employed with dual functions for Li-O_(2)batteries,which can serve as a RM and a SEI film-forming *** Br^(–)is beneficial to facilitating the decomposition of Li_(2)O_(2)and thus decreasing the ***,a uniform SEI film containing Mg and MgO generates on Li anode surface by the in-situ spontaneous reactions of Mg^(2+)and Li anode in an O_(2)environment,which can suppress the redox shuttle of Br_(3)^-and improve the interface stability of Li anode and *** from these advantages,the cycle life of Li-O_(2)battery with MgBr_(2)electrolyte is significantly extended.

关键词： MgBr_(2) Redox mediator Redox shuttle Li anode SEI film

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Investigation of GO/PVA Composite Gate Dielectric Synaptic Transistors

Investigation of GO/PVA Composite Gate Dielectric Synaptic T...

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The 2023 International Conference on Display technology, (ICDT 2023)

作者： Yao, Rihui Fu, Xiao Liang, Zhihao Wu, Weijing Xiong, Xin Jiang, Yasi Liu, Dingrong Jiang, Bocheng Ning, Honglong Peng, Junbiao Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou510640 China

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Orbital-Ordering Driven Simultaneous Tunability of Magnetism and Electric Polarization in Strained Monolayer VCl_(3)

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Chinese Physics Letters 2024年第4期41卷 126-131页

作者：郭的坪王聪王侣锦陆赟豪吴骅张妍宁季威 Beijing Key Laboratory of Optoelectronic Functional Materials&Micro-Nano Devices Department of PhysicsRenmin University of ChinaBeijing 100872China Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education) Renmin University of ChinaBeijing 100872China Zhejiang Province Key Laboratory of Quantum Technology and Device State Key Laboratory of Silicon MaterialsDepartment of PhysicsZhejiang UniversityHangzhou 310027China Laboratory for Computational Physical Sciences(MOE) State Key Laboratory of Surface Physicsand Department of PhysicsFudan UniversityShanghai 200433China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China

Two-dimensional(2D)van der Waals magnetic materials have promising and versatile electronic and magnetic properties in the 2D limit,indicating a considerable potential to advance spintronic *** predictions thus far have not ascertained whether monolayer VCl_(3) is a ferromagnetic(FM)or anti-FM monolayer;this also remains to be experimentally *** theoretically investigate the influence of potential factors,including C_(3) symmetry breaking,orbital ordering,epitaxial strain,and charge doping,on the magnetic ground *** first-principles calculations,we predict a collinear type-Ⅲ FM ground state in monolayer VCl_(3) with a broken C_(3) symmetry,wherein only the former two of three t_(2g)orbitals(a_(1g),e_(g2)^(π)and e_(g1)^(π))are *** atomic layer thickness and bond angles of monolayer VCl_(3) undergo abrupt changes driven by an orbital ordering switch,resulting in concomitant structural and magnetic phase *** doping to the underlying Cl atoms of monolayer VCl_(3) without C_(3) symmetry simultaneously induces in-and out-of-plane *** can achieve a multiferroic phase transition if combined with the discovered adjustments of magnetic ground state and polarization magnitude under *** establishment of an orbital-ordering driven regulatory mechanism can facilitate deeper exploration and comprehension of magnetic properties of strongly correlated systems in monolayer VCl_(3).

关键词： monolayer symmetry orbital

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Optical neural networks:progress and challenges

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Light(Science & Applications) 2024年第11期13卷 2511-2535页

作者： Tingzhao Fu Jianfa Zhang Run Sun Yuyao Huang Wei Xu Sigang Yang Zhihong Zhu Hongwei Chen College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangshaChina Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices National University of Defense TechnologyChangshaChina Nanhu Laser Laboratory National University of Defense TechnologyChangshaChina Department of Electronic Engineering Tsinghua UniversityBeijingChina Beijing National Research Center for Information Science and Technology(BNRist) BeijingChina

Artificial intelligence has prevailed in all trades and professions due to the assistance of big data resources,advanced algorithms,and high-performance electronic ***,conventional computing hardware is inefficient at implementing complex tasks,in large part because the memory and processor in its computing architecture are separated,performing insufficiently in computing speed and energy *** recent years,optical neural networks(ONNs)have made a range of research progress in optical computing due to advantages such as subnanosecond latency,low heat dissipation,and high *** are in prospect to provide support regarding computing speed and energy consumption for the further development of artificial intelligence with a novel computing ***,we first introduce the design method and principle of ONNs based on various optical ***,we successively review the non-integrated ONNs consisting of volume optical components and the integrated ONNs composed of on-chip ***,we summarize and discuss the computational density,nonlinearity,scalability,and practical applications of ONNs,and comment on the challenges and perspectives of the ONNs in the future development trends.

关键词： networks neural hardware

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Approaching the uniaxiality of magnetic anisotropy in singlemolecule magnets

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Science China Chemistry 2023年第3期66卷 683-702页

作者： Chen Wang Yin-Shan Meng Shang-Da Jiang Bing-Wu Wang Song Gao School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China Beijing National Laboratory of Molecular Science Beijing Key Laboratory for Magnetoeletric Materials and DevicesCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116024China Spin-X Institute School of Chemistry and Chemical EngineeringState Key Laboratory of Luminescent Materials and DevicesGuangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional MaterialsSouth China University of TechnologyGuangzhou 510641China

Single-molecule magnets(SMMs),which can exhibit slow magnetization relaxation and bulk-magnet-like hysteresis of purely molecular origin,are promising candidates for high-density information storage,molecular spintronics,and quantum *** realize their applications,it is crucial to improve the blocking temperature(TB)and the effective relaxation barrier(Ueff).Three decades of multidisciplinary research have yielded distinct SMMs with a state-of-the-art Ueff of up to 2,000 K and a TB of up to the liquid nitrogen *** strategies have been investigated and summarized,which revealed that enhancing the uniaxiality of magnetic anisotropy is critical for constructing high-performance ***,magnetic anisotropy,a key property that connects the molecular structure symmetry and performance of SMMs,plays a fundamental role in dictating magneto-structural *** and employing magnetic anisotropy would be significantly beneficial for rationally designing high-performance *** review focuses on the magnetic anisotropy of *** illustrate the origin and manifestation of magnetic anisotropy in mononuclear 3d-and 4f-block metal *** then introduce developed approaches to investigate magnetic anisotropy both theoretically and *** SMMs by optimizing uniaxial magnetic anisotropy through lanthanide metallocene,symmetry controlling,and low-coordination approaches are ***,the remaining challenges and opportunities in this field will be discussed.

关键词： single-molecule magnets magnetic anisotropy uniaxiality lanthanide

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Study of the electronic property of large-area PdSe2 films prepared by plasma enhanced chemical vapor deposition at low temperature 9

Study of the electronic property of large-area PdSe2 films p...

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9th International Conference on Energy Materials and Electrical Engineering, ICEMEE 2023

作者： Zhang, Rui Wen, Shaofeng Gong, Yiming Zhang, Qiusong Lan, Changyong Li, Chun State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu China

ISBN: (纸本)9781510672765

Due to its outstanding qualities, including high carrier mobility, a broadband tunable bandgap, and ambient-environment stability, the two-dimensional material palladium diselenide (PdSe2) has garnered considerable interest. The direct synthesis of PdSe2 on a polyimide (PI) substrate using reported methods in literature is challenging, primarily due to the high synthesis temperature requirement of over 250 °C. In this study, we report the direct synthesis of a large-area PdSe2 film on a PI substrate at 150 °C by Plasma-Enhanced Chemical Vapor Deposition (PECVD). The Hall measurement results show that the film prepared on PI substrate has a carrier mobility of 2.4 cm2 V-1 s-1. Our study demonstrates the effectiveness of PECVD as a method to synthesize large-area PdSe2 films at low temperatures, suggesting prospective applications in flexible electronic devices. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： dimensional material palladium diselenide plasma-enhanced chemical vapor deposition

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Clean assembly of van der Waals heterostructures using microdome polymer with an h-BN sacrificial layer

Clean assembly of van der Waals heterostructures using micro...

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2024 International Conference on optoelectronic Materials and devices, ICOMD 2024

作者： Wen, Shaofeng Zhang, Rui Zhou, Shuren Lan, Changyong Li, Chun State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu611731 China

ISBN: (数字)9781510689046

ISBN: (纸本)9781510689039

Van der Waals (vdW) heterostructures are fabricated by layer-by-layer assembly of individual two-dimensional (2D) materials, offering great potential for various optoelectronic devices. However, conventional assembly techniques often involve direct contact between the polymer supports and the materials, leading to contamination that degrades device performance. Here, we report a novel dry transfer technique using a microdome polymer (MDP) with a sacrificial layer for assembling van der Waals heterostructures. A dimethylpolysiloxane (PDMS)-based MDP is covered with a polyvinyl chloride (PVC) adhesion layer. The presence of the sacrificial layer allows for the fabrication of the device without the polymer coming into direct contact with the heterostructures. The resulting heterostructures have high-quality interfaces without interlayer contamination and superior photoelectronic behavior. Using this technique, we fabricated MoS2/WSe2 heterostructures, achieving a tenfold improvement in rectification ratio, responsivity, and response time, and a 3.3-fold improvement in Ilight/Idark ratio compared to the conventional transfer technique. © 2025 SPIE.

关键词： Van der Waals forces

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Flexible Piezoresistive Sensor With High Strain Sensitivity and Pressure Insensitivity for Motion Monitoring

IEEE Journal on Flexible Electronics

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IEEE Journal on Flexible Electronics 2024年第1期3卷 4-9页

作者： Du, Yi Sun, Lin Yang, Lu Jiang, Chengpeng Xu, Wentao Institute of Photoelectronic Thin Film Devices and Technology Key Laboratory of Optoelectronic Thin Film Devices and Technology of Tianjin Engineering Research Center of Thin Film Optoelectronics Technology Ministry of Education The National Institute for Advanced Materials Nankai University Tianjin300350 China Shenzhen Research Institute of Nankai University Nankai University Shenzhen518000 China

Flexible strain sensors have attracted particular attention in monitoring the biological activity of organisms. This article presents a flexible piezoresistive strain sensor (FPSS) that uses nano- and micromaterials and a sensitive unit with a microspheric structure. The stretchable strain sensor exploits carbon nanotubes (CNTs) and achieves stable strain sensing performance with excellent Qhmic characteristics and good durability, possesses a high sensitivity [gauge factor (GF) ≈ 146] under tensile strain, and is insensitive to pressure. While attached to human skin areas, it can distinguish facial expressions, deep breathing, and finger motions. These results imply this strain sensor may have applications in e-skins. © 2022 IEEE.

关键词： Face recognition

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