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Thermodynamics of order and randomness in dopant distributions inferred from atomically resolved imaging

npj Computational Materials 2021年第1期7卷 397-405页

作者： Lukas Vlcek Shize Yang Yongji Gong Pulickel Ajayan Wu Zhou Matthew FChisholm Maxim Ziatdinov Rama K.Vasudevan Sergei V.Kalinin Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTNUSA joint Institute for Computational Sciences University of TennesseeKnoxvilleOak RidgeTNUSA Center for Functional Nanomaterials Brookhaven National LaboratoryBrookhavenNYUSA school of Materials Science and Engineering Beihang UniversityBeijingChina Department of Materials Science and nanoengineering Rice UniversityHoustonTXUSA Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTNUSA

Exploration of structure-property relationships as a function of dopant concentration is commonly based on mean field theories for solid ***,such theories that work well for semiconductors tend to fail in materials with strong correlations,either in electronic behavior or chemical *** these cases,the details of atomic arrangements are generally not explored and *** knowledge of the generative physics and chemistry of the material can obviate this problem,since defect configuration libraries as stochastic representation of atomic level structures can be generated,or parameters of mesoscopic thermodynamic models can be *** obtain such information for improved predictions,we use data from atomically resolved microscopic images that visualize complex structural correlations within the system and translate them into statistical mechanical models of structure *** the significant uncertainties about the microscopic aspects of the material’s processing history along with the limited number of available images,we combine model optimization techniques with the principles of statistical hypothesis *** demonstrate the approach on data from a series of atomically-resolved scanning transmission electron microscopy images of Mo_(x)Re_(1-x)S_(2) at varying ratios of Mo/Re stoichiometries,for which we propose an effective interaction model that is then used to generate atomic configurations and make testable predictions at a range of concentrations and formation temperatures.

关键词： atomic resolved dopant

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Record-Breaking Frequency of 44 GHz Based on the Higher Order Mode of Surface Acoustic Waves with LiNbO_(3)/SiO_(2)/SiC Heterostructures

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Engineering 2023年第1期20卷 112-119页

作者： Jian Zhou Dinghong Zhang Yanghui Liu Fengling Zhuo Lirong Qian Honglang Li Yong-Qing Fu Huigao Duan College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China Tianjin Key Laboratory of Film Electronic and Communication Devices School of Integrated Circuit Science and EngineeringTianjin University of TechnologyTianjin 30084China CAS Center for Excellence in nanoscience National Center for Nanoscience and TechnologyBeijing 100190China Faculty of Engineering and Environment Northumbria UniversityNewcastle upon Tyne NE18STUK

Surface acoustic wave (SAW) technology has been extensively explored for wireless communication, sensors, microfluidics, photonics, and quantum information processing. However, due to fabrication issues, the frequencies of SAW devices are typically limited to within a few gigahertz, which severely restricts their applications in 5G communication, precision sensing, photonics, and quantum control. To solve this critical problem, we propose a hybrid strategy that integrates a nanomanufacturing process (i.e., nanolithography) with a LiNbO_(3)/SiO_(2)/SiC heterostructure and successfully achieve a record-breaking frequency of about 44 GHz for SAW devices, in addition to large electromechanical coupling coefficients of up to 15.7%. We perform a theoretical analysis and identify the guided higher order wave modes generated on these slow-on-fast SAW platforms. To demonstrate the superior sensing performance of the proposed ultra-high-frequency SAW platforms, we perform micro-mass sensing and obtain an extremely high sensitivity of approximately 33151.9 MHz·mm2·μg−1, which is about 1011 times higher than that of a conventional quartz crystal microbalance (QCM) and about 4000 times higher than that of a conventional SAW device with a frequency of 978 MHz.

关键词： Ultra-high frequency SAW Higher order mode Hyper sensitive detection

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Mode Structures and Damping of Quantized Spin Waves in Ferromagnetic Nanowires

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Chinese Physics Letters 2020年第8期37卷 142-146页

作者： Qingwei Fu Yong Li Lina Chen Fusheng Ma Haotian Li Yongbing Xu Bo Liu Ronghua Liu and Youwei Du National Laboratory of Solid State Microstructures School of Physics and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Jiangsu Key Laboratory of Opto-Electronic Technology Center for Quantum Transport and Thermal Energy ScienceSchool of Physics and TechnologyNanjing Normal UniversityNanjing 210023China York-Nanjing joint Center(YNJC)for Spintronics and nanoengineering School of Electronics Science and EngineeringNanjing UniversityNanjing 210093China Spintronics and Nanodevice Laboratory Department of ElectronicsUniversity of YorkYork YO105DDUnited Kingdom Key Laboratory of Spintronics Materials Devices and Systems of Zhejiang ProvinceHangzhou 311300China

Magnonic devices based on spin waves are considered as a new generation of energy-efficient and high-speed devices for storage and processing of *** we experimentally demonstrate that three distinct dominated magneto-dynamic modes are excited simultaneously and coexist in a transversely magnetized ferromagnetic wire by the ferromagnetic resonance(FMR)*** the uniform FMR mode,the spin-wave well mode,the backward volume magnetostatic spin-wave mode,and the perpendicular standing spin-wave mode are experimentally observed and further confirmed with more detailed spatial profiles by micromagnetic ***,our experimental approach can also access and reveal damping coefficients of these spin-wave modes,which provides essential information for development of magnonic devices in the future.

关键词： technique. ferromagnetic wave

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Fabricating polymer/HEA-hybrid topological lattice structure for enhanced mechanical properties

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Progress in Natural Science:Materials International 2022年第6期32卷 800-805页

作者： Wentao Zhang Zhongzheng Yao Sihan Zhang Sinan Liu Huiqiang Ying Jiacheng Ge Shu Fu Yu Lou Xiang Li Zhenduo Wu He Zhu Shuangqin Chen Si Lan Herbert Gleiter Institute of nanoscience School of Materials Science and Engineering Nanjing University of Science and Technology school of Sciences Nanjing University of Science and Technology Center for Neutron Scattering and Physics Department City University of Hong Kong Dongguan Research Institute Shenzhen Research Institute City University of Hong Kong

Metamaterials such as architected lattice structures have aroused broad interest in being applied as mechanical supports for their lightweight and custom-shaped *** various prior efforts have been devoted,a multiscale fabrication of micro-nano lattice structures without penalizing the mechanical properties is still a challenging but highly desirable *** we put forward a strategy to produce a mechanically enhanced micro-nano lattice structure by conformally depositing a CoCrFeNiTi high-entropy alloy(HEA) coating layer onto a three-dimensional(3D) printed polymer *** template for the 3D printing employs a six-membered tricapped trigonal prism(6M-TTP) structure derived from a medium-range order structure motif in amorphous *** topological complexity of the 6M-TTP can substantially avoid the stress concentration by offering stress-release channels,while the HEA film incorporating with amorphous and nanocrystalline constituents can further reinforce the lattice architecture through its size hardening *** from the above,the fabricated polymer/HEA-hybrid lattice exhibits a high specific compressive strength(～0.055 MPa kg-1m3at a density below 500 kg m-3),a superior elastic recoverability(～70% recovery rate under>30% compression),an enhanced plasticity(40% strain) and a high specific modulus(0.135 MPa kg-1m3).Our strategy initiates a perspective way to fabricate multiscale micro-nano lattice structures with improved mechanical properties,which could be extended to widespread metamaterial research.

关键词： Nanocrystals

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Porous nanocomposites with enhanced intrinsic piezoresistive sensitivity for bioinspired multimodal tactile sensors

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Microsystems & nanoengineering 2024年第1期10卷 243-256页

作者： Jianpeng Zhang Song Wei Caichao Liu Chao Shang Zhaoqiang He Yu Duan Zhengchun Peng State Key Laboratory of Radio Frequency Heterogeneous Integration(Shenzhen University) School of Physics and Optoelectronic EngineeringShenzhen University518060 ShenzhenGuangdong ProvinceP.R.China Linksense Technology Ltd. 518060 ShenzhenGuangdong ProvinceP.R.China

In this work,we propose porous fluororubber/thermoplastic urethane nanocomposites(PFTNs)and explore their intrinsic piezoresistive sensitivity to *** experiments reveal that the intrinsic sensitivity of the PFTN-based sensor to pressure up to 10 kPa increases up to 900%compared to the porous thermoplastic urethane nanocomposite(PTN)counterpart and up to 275%compared to the porous fluororubber nanocomposite(PFN)*** pressures exceeding 10 kPa,the resistance-pressure relationship of PFTN follows a logarithmic function,and the sensitivity is 221%and 125%higher than that of PTN and PFN,*** the excellent intrinsic sensitivity of the thick PFTN film,a single sensing unit with integrated electrode design can imitate human skin for touch detection,pressure perception and traction *** sensing range of our multimodal tactile sensor reaches~150 Pa,and it exhibits a linear fit over 97%for both normal pressure and shear *** also demonstrate that an electronic skin,made of an array of sensing units,is capable of accurately recognizing complex tactile interactions including pinch,spread,and tweak motions.

关键词： sensation intrinsic modal

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Nested hollow architectures of nitrogen-doped carbon-decorated Fe,Co,Ni-based phosphides for boosting water and urea electrolysis

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Nano Research 2022年第3期15卷 1916-1925页

作者： Jie Zhang Shoushuang Huang Ping Ning Peijun Xin Zhiwen Chen Qing Wang Kajsa Uvdal Zhangjun Hu Shanghai Applied Radiation Institute School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China Division of Molecular Surface Physics&nanoscience Department of PhysicsChemistry and BiologyLinköping UniversityLinköping 58183Sweden

Tailoring the nanostructure/morphology and chemical composition is important to regulate the electronic configuration of electrocatalysts and thus enhance their performance for water and urea ***,the nitrogen-doped carbon-decorated tricomponent metal phosphides of FeP4 nanotube@Ni-Co-P nanocage(NC-FNCP)with unique nested hollow architectures are fabricated by a self-sacrifice template *** from the multi-component synergy,the modification of nitrogen-doped carbon,and the modulation of nested porous hollow morphology,NC-FNCP facilitates rapid electron/mass transport in water and urea ***-FNCP-based anode shows low potentials of 248 mV and 1.37 V(*** hydrogen electrode)to attain 10 mA/cm^(2) for oxygen evolution reaction(OER)and urea oxidation reaction(UOR),*** addition,the overall urea electrolysis drives 10 mA/cm^(2) at a comparatively low voltage of 1.52 V(***)that is 110 mV lower than that of overall water electrolysis,as well as exhibits excellent stability over 20 *** work strategizes a multi-shell-structured electrocatalyst with multi-compositions and explores its applications in a sustainable combination of hydrogen production and sewage remediation.

关键词： tri-metal phosphides nested hollow nano-architecture oxygen evolution reaction urea oxidation reaction

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Photo-thermoelectric effect induced electricity in stretchable graphene-polymer nanocomposites for ultrasensitive strain sensing

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Nano Research 2019年第12期12卷 2982-2987页

作者： Ding Zhang Yiding Song Lu Ping Suwen Xu De Yang Yuanhao Wang Ya Yang CAS Center for Excellence in nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083China Department of Neurology Fuling Center Hospital of Chongqing CityChongqing 408000China Xinjiang Technical Institute of Physics&Chemistry Chinese Academy of SciencesUrumqi 830011China school of nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China Center on Nanoenergy Research School of Physical Science and TechnologyGuangxi UniversityNanning 530004China

Stretchable strain sensors play an increasingly important role in artificial intelligent ***,high-performanee strain sensors havebeen slowly developed owing to the harsh requirement of self-powered function,long cycle life and high ***,we report aself-powered stretchable graphene-ecoflex composite strain sensor based on photo-thermoelectric(PTE)effect induced *** exhibits a high strain sensitivity of-0.056 In(nA)/%with strains ranged from 0%to 20%under 980 nm light illumination,where thestrain sensitivity can be found to in crease with in creasi ng light inte *** strain sensor maintains outstanding dyn amic stability un derperiodic strains ranged from 0 to 100%in 100 *** sensing resolution can be as high as 0.5%with both the response and recovery timeof less than 0.6 *** can precisely monitor human joint motions and stretchable strains by implanting the device in pork.

关键词： graphene-polymer nanocomposites photo-thermoelectric effect strain sensor stretchable implantable

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Temperature dependence of spin pumping in YIG/NiO(x)/W multilayer

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Chinese Physics B 2022年第12期31卷 678-682页

作者： Lijun Ni Wenqiang Wang Lichuan Jin Jiandong Ye Hehe Gong Xiang Zhan Zhendong Chen Longlong Zhang Xingze Dai Yao Li Rong Zhang Yi Yang Huaiwu Zhang Ronghua Liu Lina Chen Yongbing Xu Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and EngineeringNanjing UniversityNanjing 210093China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China Jiangsu Provincial Key Laboratory for Nanotechnology School of PhysicsNanjing UniversityNanjing 210093China Jiangsu Key Laboratory of Opto-Electronic Technology Center for Quantum Transport and Thermal Energy ScienceSchool of Physics and TechnologyNanjing Normal UniversityNanjing 210023China school of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China York-Nanjing joint Centre for Spintronics and nanoengineering Department of Electronic EngineeringUniversity of YorkYork YO105DDUnited Kingdom

We report the temperature dependence of the spin pumping effect for Y_(3)Fe_(5)O_(12)(YIG,0.9μm)/NiO(tNiO)/W(6 nm)(tNiO=0 nm,1 nm,2 nm,and 10 nm)*** samples exhibit a strong temperature-dependent inverse spin Hall effect(ISHE)signal I_(c)and sensitivity to the NiO layer *** observe a dramatic decrease of I_(c)with inserting thin NiO layer between YIG and W layers indicating that the inserting of NiO layer significantly suppresses the spin transport from YIG to *** contrast to the noticeable enhancement in YIG/NiO(tNiO≈1-2 nm)/Pt,the suppression of spin transport may be closely related to the specific interface-dependent spin scattering,spin memory loss,and spin conductance at the NiO/W ***,the I_(c)of YIG/Ni O/W exhibits a maximum near the TNof the AF NiO layer because the spins are transported dominantly by incoherent thermal magnons.

关键词： spin pumping effect spin transport charge current I_(c) linewidth△H temperature dependence

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Atg5 regulates late endosome and lysosome biogenesis

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Science China(Life Sciences) 2014年第1期57卷 59-68页

作者： PENG JunYa ZHANG Ran CUI YiTong LIU HaoDong ZHAO XiaoXin HUANG Lei HU MingXu YUAN XiaoXi MA BenYu MA XiaoWei TAKASHI Ueno MASAAKI Komatsu LIANG XingJie YU Li State Key Laboratory of Biomembrane and Membrane Biotechnology Tsinghua University-Peking University Joint Center for Life SciencesSchool of Life Science Tsinghua University Cell Biology Core Facility School of Life Science Tsinghua University Tsinghua University-Peking University joint Center for Life Sciences School of Life Science Tsinghua University Laboratory of Nanomedicine and Nanosafety Division of Nanomedicine and Nanobiology National Center for Nanoscience and TechnologyChina and CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety Chinese Academy of Sciences Department of Biochemistry Juntendo University School of Medicine Bunkyo-ku Tokyo 1138421 Japan Protein Metabolism Project Tokyo Metropolitan Institute Medical Science Tokyo 1568506 Japan Department of Mathematical Sciences Tsinghua University

Autophagy is an evolutionarily conserved lysosome-based degradation ***5 plays a very important role in autophagosome *** we show that Atg5 is required for biogenesis of late endosomes and lysosomes in an autophagy-independent *** Atg5 cells,but not in other essential autophagy genes defecting cells,recycling and retrieval of late endosomal components from hybrid organelles are impaired,causing persistent hybrid organelles and defective formation of late endosomes and *** retrieval of late endosomal components from hybrid organelles resulting from impaired recruitment of a component of V1-ATPase to acidic organelles blocks the pH-dependent retrieval of late endosomal components from hybrid *** the intracellular pH restores late endosome/lysosome biogenesis in Atg5 *** data demonstrate an unexpected role of Atg5 and shed new light on late endosome and lysosome biogenesis.

关键词： endosome/lysosome biogenesis atg5 autophagy

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High harmonic exploring on different materials in dynamic atomic force microscopy

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Science China(Technological Sciences) 2018年第3期61卷 446-452页

作者： ZHENG ZhiYue XU Rui YE ShiLi HUSSAIN Sabir JI Wei CHENG Peng LI YanJun SUGAWARA Yasuhiro CHENG ZhiHai CAS Center for Excellence in nanoscience and Key Laboratory of Standardization and Measurement for Nanotechnology National Center for Nanoscience and Technology Beijing 100190 China Department of Physics Renmin University of China Beijing 100872 China The State Key Laboratory of Digital Manufacturing Equipment and Technology Department of Instrument Science and Technology School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan 430074 China University of Chinese Academy of Sciences Belting 100049 China Asylum Research Santa Barbara 93117 USA Department of Applied Physics Graduate School of Engineering Osaka University Osaka 565-0871 Japan

In atomic force microscopy(AFM), high-frequency components consisted in dynamic tip-sample interaction have been recently demonstrated as a promising technique for exploring more extensive material properties. Here we present an exploratory study of high harmonic atomic force microscopy by force-spectroscopy and high harmonic imaging. Since these components are very weak compared to the fundamental response, we firstly designed a high harmonic cantilever by tuning the second order flexural resonance frequency to an integer 6 times of its fundamental mode(i.e. ω_2=6ω_1). Moreover, it is verified that high harmonic can discern extra features than topographies on different samples with amplitude/frequency modulation(AM/FM) dynamic AFM mode. In AM mode, the first resonance amplitude and 6 th harmonic amplitude were discussed. The 6 th harmonic is more sensitive than the first order response. In FM mode, it is noted that the decaying rate of the 6 th harmonic frequency is approximately 6 multiples to the slope of the fundamental frequency shift when the tip approaches to the surface of sample. This non-destructive method was also adopted to investigate the local interlayer coupling and intercalation in the two-dimensional graphene films tentatively.

关键词： high harmonic AFM high harmonic cantilever dynamic AFM

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