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Atomic-scale engineering of oxide interfaces yields a new family of synthetic magnetic structures

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Science Bulletin 2017年第17期62卷 1169-1170页

作者： David L.Cortie Xiaolin Wang arc centre of Excellence in future low-energy electronics technologies University of WollongongNorth WoUongongNSW 2522Australia The Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of Wollongong North WollongongNSW 2522Australia

A grand challenge in the field of magnetism is to find material systems that exhibit spin structures ranging from simple ferromagnets to exquisite non-collinear *** bulk three-dimensional(3D)materials,however,the magnetic exchange interactions are constrained by the crystal symmetry and quantum chemistry,making it challenging to adjust the intrinsic magnetic structure.A

关键词：铁磁性工程师原子尺度合成结构族氧化物交换相互作用界面

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A Comprehensive FIB Lift-out Sample Preparation Method for Scanning Probe Microscopy

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Nanomanufacturing and Metrology 2022年第1期5卷 67-79页

作者： F.Ji Y.Yao T.Xin J.Seidel School of Materials Science and Engineering UNSW SydneySydneyNSW 2052Australia arc centre of Excellence in future low-energy electronics technologies(FLEET) UNSW SydneySydneyNSW 2052Australia Electron Microscopy Unit(EMU) Mark Wainwright Analytical CentreUNSW SydneySydneyNSW 2052Australia

In this work,we investigate cross-sectional sample preparation for atomic force microscopy and general scanning probe microscopy(SPM)*** light of traditional cross-sectional sample preparation solutions for transmission electron microscopy,mechanical polishing and focused ion beam(FIB)milling have been employed to prepare cross-sectional samples for *** present an optimized solution for thin films and oxide heterostructures that allows for examining the prepared surfaces using various SPM *** particular,post-cleaning after FIB milling is shown to be crucial and precision ion polishing was conducted to remove rough layers on mechanically polished *** also study SPM mechanical milling to remove amorphous layers on FIB-milled ***,a reliable solution for making cross sections suitable for SPM has been achieved providing a useful methodology that can also be employed for other material systems with different hardness,such as polymers and metals.

关键词： Oxide heterostructures Cross-sectional measurements Scanning probe microscopy AFM FIB

Voltage-induced penetration effect in liquid metals at room temperature

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National Science Review 2020年第2期7卷 366-372页

作者： Frank F Yun Zhenwei Yu Yahua He Lei Jiang Zhao Wang Haoshuang Gu Xiaolin Wang Institute for Superconducting and Electronic Materials Australian Institute for Innovative Materials University of Wollongong Laboratory of Bioinspired Smart Interfacial Science Technical Institute of Physics and Chemistry Chinese Academy of Sciences Hubei Key Laboratory of Ferro & Piezoelectric Materials and Devices Faculty of Physics and Electronic Sciences Hubei University arc centre of Excellence in future low-energy electronics technologies University of Wollongong

Room-temperature liquid metal is discovered to be capable of penetrating through macro-and microporous materials by applying a voltage. The liquid metal penetration effects are demonstrated in various porous materials such as tissue paper, thick and fine sponges, fabrics, and meshes. The underlying mechanism is that the high surface tension of liquid metal can be significantly reduced to near-zero due to the voltage-induced oxidation of the liquid metal surface in a solution. It is the extremely low surface tension and gravity that cause the liquid metal to superwet the solid surface, leading to the penetration phenomena. These findings offer new opportunities for novel microfluidic applications and could promote further discovery of more exotic fluid states of liquid metals.

关键词： penetration effects liquid metals surface tension porous materials superwet

Multiferroics under the tip: probing magnetoelectric coupling at the nanoscale

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National Science Review 2019年第4期6卷 626-628页

作者： Yunya Liu Jan Seidel Jiangyu Li Key Laboratory of low Dimensional Materials and Application Technology of Ministry of Education School of Materials Science and Engineering Xiangtan University School of Materials Science and Engineering University of New South Wales arc centre of Excellence in future low-energy electronics technologies University of New South Wales Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences Department of Mechanical Engineering University of Washington

Multiferroic materials, with the coexistence of electric and magnetic orderings and thus exhibition of magnetoelectric coupling, offer an intriguing playground for controlling and understanding the structure of condensed matter interacting with external stimuli, and promise exciting opportunities for technological applications. While originally

关键词： Multiferroics under the tip probing magnetoelectric coupling at the nanoscale

Emerging high-entropy material electrodes for metal-ion batteries

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SusMat 2024年第4期4卷 152-174页

作者： Jianyu Shen Zhen Zeng Weihua Tang College of Materials Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM)Institute of Flexible Electronics(Future Technologies)Xiamen UniversityXiamenChina

High-entropy materials(HEMs)have recently attracted extensive research *** unique structural characteristics and excellent mechan-ical/chemical properties,HEMs(especially high-entropy alloys and oxides)emerge as promising electrode materials for electrochemical energy *** herein present a critical review to update the recent progress in develop-ing new HEMs electrodes for various metal-ion *** design principle is discussed along with the preparation,characterization,and electrochemical performance as electrode *** current state-of-the-art HEM electrodes is presented,covering good capacity,rate capacity,and long-term cycle stability in ion *** addressing both the success and challenges associated with HEM development,this review contributes to the recent research efforts toward achieving higher capacity and more stable ion batteries.

关键词： high-entropy electrodes metal-ion battery energy storage

Unraveling the synergetic mechanism of physisorption and chemisorption in laser-irradiated monolayer WS_(2)

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Nano Research 2021年第11期14卷 4274-4280页

作者： Yuanzheng Li Jiaxu Yan Jinping Chen Tong Yu Hang Ren Xiuling Liu Weizhen Liu Guochun Yang Chunxiang Xu Qiaoliang Bao Yichun Liu Haiyang Xu Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education Northeast Normal UniversityChangchun130024China State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing210096China School of Materials Science and Engineering Changchun University of Science and TechnologyChangchun130022China Department of Materials Science and Engineering ARC Centre of Excellence in Future Low-Energy Electronics Technologies(FLEET)Monash UniversityWellington RoadClaytonVIC3800Australia

To further improve the quantum efficiency of atomically thin transition metal dichalcogenides (TMDs) is crucial for the realization of high-performance optoelectronic applications. To this regard, a few chemical or physical approaches such as superacid treatment, electrical gating, dielectric screening, and laser irradiation have been developed. In particular, the laser irradiation appears to be a more efficient way with good processability and spatial selectivity. However, the underlying mechanism especially about whether chemisorption or physisorption plays a more important role is still debatable. Here, we unravel the mystery of laser irradiation induced photoluminescence enhancement in monolayer WS_(2) by precisely controlling irradiation time and environment. It is found that the synergetic effect of physisorption and chemisorption is responsible for the photoluminescence enhancement, where the physisorption dominates with more than 74% contribution. The comprehensive understanding of the adsorption mechanism in laser-irradiated TMDs may trigger the potential applications for patterned light source, effective photosensor and ultrathin optical memory.

关键词： WS_(2) photoluminescence laser irradiation physisorption chemisorption

Strong interactions in molybdenum disulfide heterostructures boosting the catalytic performance of water splitting: A short review

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Nano Materials Science 2019年第4期1卷 231-245页

作者： Bo Shang Lin Jiao Qiaoliang Bao Changming Li Xiaoqiang Cui Key Laboratory of Automobile Materials of MOE School of Materials Science and EngineeringJilin University2699 Qianjin StreetChangchun130012People's Republic of China Department of Materials Science and Engineering ARC Centre of Excellence in Future Low-Energy Electronics Technologies(FLEET)Monash UniversityClaytonVictoria3800Australia Institute of Advanced Cross-field Science College of Life ScienceQingdao UniversityChina

Two-dimensional materials(2DMs) have attracted substantial attention due to their abundant active sites and their ultrahigh surface area for different catalytic applications due to the high lateral-longitudinal ratio. Transition metal dichalcogenides(TMDs), especially MoS2, as one of the 2DMs most often studied, have shown superior activity in electrochemical applications. Recently, combinations of different 2DMs have been widely studied, and they appear to be the most promising strategy available to develop state of the art catalysts for different *** this article, we review the interactions between MoS2 and other materials as well as the novel assembly induced phase transitions of TMDs and their underlying mechanisms. Several methods for inducing the phase transition of TMDs by building MoS2-based heterostructures have been introduced. The electronic coupling between these counterparts has significantly enhanced their conductivity and optimized the energy states of the materials, thus introducing enhanced activity as compared to their original counterparts. The ideas summarized in this article may shed new light on and help to develop next-generation green energy materials by designing and constructing highly active two-dimensional catalysts for efficient water splitting.

关键词： Molybdenum disulfide Heterostructure Phase transition Interaction Water splitting

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Brightening heavily doped upconversion nanoparticles by tuning characteristics of core-shell structures

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Journal of Rare Earths 2024年第5期42卷 947-954,I0005页

作者： Yangyang Niu Zhihao Bao Yuqin Gao Mengchao Guo Jingyao Liu Jinjun Shao Min Lu Ze Yuan Xiaoji Xie School of Flexible electronics(future technologies)&Institute of Advanced Materials(IAM) Nanjing Tech UniversityNanjing211816China

Heavily doped upconversion nanoparticles(UCNPs)potentially have exceptional photon upconversion abilities that are promising for diverse applications,such as lasing and super-resolution ***,heavily doped UCNPs typically can only offer mediocre upconversion luminescence intensity,and there still lacks general guidelines for the design and synthesis of heavily doped ***,in order to boost the upconversion luminescence of heavily doped UCNPs,we studied the influence of characteristics of the core-shell structure on heavily doped UCNPs'upconversion *** find that some empirical guidelines derived from conventional UCNPs are not suitable for heavily doped *** NaYbF_(4):Tm@NaYF_(4) core-shell UCNPs with a high concentration of Yb_(3+)as a representative,our studies reveal that a rather thick inert NaYF4 shell is needed to protect the UCNPs from surface quenching,and the upconversion luminescence may undergo the cooperative sensitization process,which should be due to the highly concentrated Yb~(3+)*** addition,the upconversion luminescence of heavily doped NaYbF4:Tm UCNPs exhibits no obvious dependence on the type of inert ***,our results show that confining both Yb~(3+)and Tm~(3+)dopants in a thin layer(known as theδ-doping strategy)does not work well in the heavily doped ***,we propose a NaYbF_(4):Tm@NaYbF_(4)@NaYF_(4) core-shell-shell structure to enhance the luminescence of heavily doped UCNPs,by weakening the dissipation of excitation energy and strengthening the *** findings should be helpful to establish general design principles for developing the brightest possible UCNPs that can meet the requirements of various applications.

关键词： Luminescence Upconversion Nanomaterials Rare earths Lanthanide doping

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Anisotropic polaritons in van der Waals materials

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InfoMat 2020年第5期2卷 777-790页

作者： Weiliang Ma Babar Shabbir Qingdong Ou Yemin Dong Huanyang Chen Peining Li Xinliang Zhang Yuerui Lu Qiaoliang Bao Wuhan National Laboratory for Optoelectronics Department of Materials Science and Engineering ARC Centre of Excellence in Future Low-Energy Electronics Technologies(FLEET)Monash UniversityClaytonVictoriaAustralia State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghaiChina School of Electronic Science and Engineering Xiamen UniversityXiamenFujian ProvinceChina Research School of Electrical Energy and Materials Engineeringthe Australian National UniversityCanberraAustralian Capital TerritoryAustralia

Polaritons in two-dimensional(2D)materials continues to garner significant attention due to their favorable ability of field-confinement and intriguing potential for low-loss and ultrafast optical and photonic *** recent experimental observation of in-plane anisotropic dispersion in natural van der Waals materials has revealed much richer physics as compared to isotropic plasmonic materials,which provides new insight to manipulate the polaritons and manufacture flat optical devices with unprecedented ***,we give an overview of the recent progress in in-plane anisotropic polaritons launched and visualized in the near-field range in 2D layered van der Waals ***,future prospects in this promising but emerging field are featured on the basis of its peculiar *** review article will stimulate the scientific community to explore other hyperbolic materials and structures in order to develop optical technologies with novel functionalities and further improve the understanding of the exotic photonic phenomena.

关键词： hyperbolic materials in-plane anisotropy optical and photonic devices polaritons scanning nearfield optical microscopy