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Vibration analysis of atomic force microscope cantilevers in contact resonance force microscopy using Timoshenko beam model

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Acta Mechanica Solida Sinica 2017年第5期30卷 520-530页

作者： xilong zhou Pengfei Wen Faxin Li Department of Engineering Structure and Mechanics School of Science Wuhan University of Technology Wuhan Hubei 430070 China Hubei Key Laboratory of Theory and Applications of Advanced Materials Mechanics Wuhan University of Technology Wuhan Hubei 430070 China Department of Mechanics & Engineering Science College of Engineering Peking University Beijing 100871 China

Timoshenko beam model is employed to investigate the vibration of atomic force mi- croscope （AFM） cantilevers in contact resonance force microscopy （CRFM）. Characteristic equation with both vertical and lateral tip-sample contact is derived. The contact resonance frequencies （CRFs） obtained by the Timoshenko model are compared with those by the Euler-Bernoulli model. A method is proposed to correct the wave number obtained by the Euler-Bernoulli model. The forced vibration is compared between the two models. Results reveal that the Timoshenko model is superior to the Euler-Bernoulli model in predicting the vibration characteristics for cantilevers＇ higher eigenmodes.

关键词： NanomechanicsTimoshenko modelForced vibration

Pressure-triggered stacking dependence of interlayer coupling in bilayer WS_(2)

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Science China(Physics,Mechanics & Astronomy) 2024年第8期67卷 177-186页

作者： Zejuan Zhang Chenyin Jiao Shenghai Pei xilong zhou Jiaze Qin Wanli Zhang Yu zhou Zenghui Wang Juan Xia School of Integrated Sciences and Engineering(Exemplary School of Microelectronics) University of Electronic Science and Technology of ChinaChengdu 610054China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 611731China School of Physics and Electronics Hunan Key Laboratory of Nanophotonics and DevicesCentral South UniversityChangsha 410083China

Tungsten disulfide(WS_(2))has been reported to show negligible stacking dependence under ambient conditions,impeding its further explorations on physical properties and potential ***,we realize efficient modulation of interlayer coupling in bilayer WS_(2)with 3R and 2H stackings by high pressure,and find that the pressure-triggered interlayer coupling and pressure-induced resonant-to-nonresonant transition exhibit prominent stacking dependence,which are experimentally observed for the first time in *** work may unleash the stacking degree of freedom in designing WS_(2)devices with tailored properties correlated to interlayer coupling.

关键词： tungsten disulfide pressure engineering stacking order interlayer coupling

Progress in the preparation and physical properties of two-dimensional Cr-based chalcogenide materials and heterojunctions

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Frontiers of physics 2024年第2期19卷 105-130页

作者： Xiulian Fan Ruifeng Xin Li Li Bo Zhang Cheng Li xilong zhou Huanzhi Chen Hongyan Zhang Fangping OuYang Yu zhou School of Physics and Electronics Hunan Key Laboratory of Nanophotonics and DevicesCentral South UniversityChangsha 410083China Jincheng Research Institute of Opto-mechatronics Industry Jincheng 048000China Shanxi Key Laboratory of Advanced Semiconductor Optoelectronic Devices and Integrated Systems Jincheng 048000China School of Physical Science and Technology Xinjiang UniversityUrumqi 830046China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China

Two-dimensional transition metal dichalcogenides(TMDs)exhibit promising application prospects in the domains of electronic devices,optoelectronic devices and spintronic devices due to their distinctive energy band structures and spin−orbit coupling ***-based chalcogenides with narrow or even zero bandgap,covering from semiconductors to metallic materials,have considerable potential for wide-band photodetection and two-dimensional ***,the preparation of 2D CrX_(n)(X=S,Se,Te)nanosheets primarily relies on chemical vapor deposition(CVD)and molecule beam epitaxy(MBE),which enable the production of high-quality large-area *** review article focuses on recent progress of 2D Cr-based chalcogenides,including unique crystal structure of the CrX_(n)system,phase-controlled synthesis,and heterojunction ***,a detailed introduction of room-temperature ferromagnetism and electrical/optoelectronic properties of 2D CrXn is ***,this paper summarizes the challenges associated with utilizing 2D Cr-based chalcogenides in preparation strategies,optoelectronics devices,and spintronic devices while providing further insights.

关键词： physical properties two-dimensional materials Cr-based chalcogenide controlled synthesis heterojunction eletronic and optoelectronic devices

Stable alkali halide vapor assisted chemical vapor deposition of 2D HfSe2 templates and controllable oxidation of its heterostructures

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Frontiers of physics 2024年第3期19卷 29-38页

作者： Wenlong Chu xilong zhou Ze Wang Xiulian Fan Xuehao Guo Cheng Li Jianling Yue Fangping Ouyang Jiong Zhao Yu zhou School of Physics Hunan Key Laboratory of Nanophotonics and DevicesCentral South UniversityChangsha 410083China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing100190China Department of Applied Physics The Hong Kong Polytechnic UniversityKowloonHong KongChina

Two-dimensional hafnium-based semiconductors and their heterostructures with native oxides have been shown unique physical properties and potential electronic and optoelectronic ***,the scalable synthesis methods for ultrathin layered hafnium-based semiconductor laterally epitaxy growth and its heterostructure are still restricted,also for the understanding of its formation ***,we report the stable sublimation of alkali halide vapor assisted synthesis strategy for high-quality 2D HfSe_(2) nanosheets via chemical vapor ***-crystalline ultrathin 2D HfSe_(2) nanosheets were systematically grown by tuning the growth parameters,reaching the lateral size of 6‒40μm and the thickness down to 4.5 *** scalable amorphous HfO_(2)and HfSe_(2)heterostructures were achieved by the controllable oxidation,which benefited from the approximate zero Gibbs free energy of unstable 2D HfSe_(2) *** crystal structure,elemental,and time dependent Raman characterization were carried out to understand surface precipitated Se atoms and the formation of amorphous Hf−O bonds,confirming the slow surface oxidation and lattice incorporation of oxygen *** relatively smooth surface roughness and electrical potential change of HfO_(2)−HfSe_(2) heterostructures indicate the excellent interface quality,which helps obtain the high performance memristor with high on/off ratio of 105 and long retention period over 9000 *** work introduces a new vapor catalysts strategy for the synthesis of lateral 2D HfSe_(2) nanosheets,also providing the scalable oxidation of the Hf-based heterostructures for 2D electronic devices.

关键词： chemical vapor deposition HfSe_(2)−HfO_(2) nanoelectronics

双模态振幅调制原子力显微术相互作用区转变研究

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力学学报 2018年第5期50卷 1104-1114页

作者：周锡龙李法新武汉理工大学理学院武汉430070 武汉理工大学新材料力学理论与应用湖北省重点实验室武汉430070 北京大学工学院北京100871

双模态振幅调制原子力显微术测试或成像过程中存在引力区和斥力区两种相互作用区.开展双模态振幅调制原子力显微术针尖样品相互作用区转变的研究,对于在特定作用区内成像的参数设置、相互作用区范围的控制,以及对成像结果的正确理解和... 详细信息

双模态振幅调制原子力显微术测试或成像过程中存在引力区和斥力区两种相互作用区.开展双模态振幅调制原子力显微术针尖样品相互作用区转变的研究,对于在特定作用区内成像的参数设置、相互作用区范围的控制,以及对成像结果的正确理解和解释尤为重要.将有限差分法和同相正交法相结合,采用数值模拟方法研究了探针模态自由振幅大小设定、样品力学性能变化以及模态激励频率的设置对双模态振幅调制原子力显微术相互作用区转变的影响.研究结果表明,探针模态自由振幅之和越大,则引力区向斥力区转变时的临界设定点越大,使探针位于引力区的设定点的范围越小.样品的弹性模量越大、黏度系数越小,探针在接近样品过程中引力区向斥力区转变发生越早,即引力区设定点的范围越小.偏离自由共振频率对探针进行激励时,引力区的范围均小于以自由共振频率激励时的引力区范围,探针运动状态的突变并不一定对应相互作用区的转变,且不能将相位值是否高于或低于90°作为判定探针位于引力区或斥力区的依据.

关键词：双模态原子力显微术振幅调制相互作用区

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双模态振幅调制原子力显微术对比度反转研究

固体力学学报 2020年第5期41卷 433-443页

作者：黄震阳周锡龙武汉理工大学理学院新材料力学理论与应用湖北省重点实验室武汉430070

双模态振幅调制原子力显微术广泛应用于微纳米力学成像,然而成像过程中可能存在的对比度反转问题会造成成像结果的难以理解和解释.将有限差分法和同相正交法相结合,采用数值方法研究了不同力常数探针、样品组分力学性能以及成像参数设... 详细信息

双模态振幅调制原子力显微术广泛应用于微纳米力学成像,然而成像过程中可能存在的对比度反转问题会造成成像结果的难以理解和解释.将有限差分法和同相正交法相结合,采用数值方法研究了不同力常数探针、样品组分力学性能以及成像参数设置对双模态振幅调制原子力显微术二阶模态振幅和相位对比度反转的影响.研究结果显示,对于硬探针,不同粘度系数组分上二阶模态振幅和相位对比度随弹性模量增加无反转产生.探针在不同弹性模量组分上二阶模态振幅对比度随粘度系数增加会产生反转,而二阶模态相位对比度则无反转产生.对于软探针,组分弹性模量或粘度系数增加会造成相互作用区转变,使探针响应产生跳变.软探针在组分弹性模量较高时二阶模态相位对不同粘度系数的对比度以及在粘度系数较小时对不同弹性模量组分的对比度均较硬探针更低.两种探针在不同弹性模量组分上二阶模态振幅对比度随着二阶模态自由振幅的增加会发生反转,而不同粘度系数下的对比度则未出现反转.此外,二阶模态自由振幅越小,则二阶模态相位对不同弹性模量或粘度系数组分的对比度越高.二阶模态振幅或相位对比度在不同相互作用区可能会发生反转,成像时应使相互作用区处于排斥区,可提高对比度.

关键词：原子力显微术双模态成像对比度非线性

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扫描探针声学显微技术研究进展

固体力学学报 2016年第2期37卷 107-134页

作者：周锡龙李法新付际武汉理工大学理学院工程结构与力学系武汉430070 北京大学工学院力学与工程科学系北京100871

纳米科技的快速发展迫切需要对材料小尺度下的力学性能进行定量化测试与表征.将声学和原子力显微镜相结合的扫描探针声学显微技术(Atomic Force Acoustic Microscopy,AFAM)是近年来发展的一项定量化纳米力学测试方法,具有高分辨和无损... 详细信息

纳米科技的快速发展迫切需要对材料小尺度下的力学性能进行定量化测试与表征.将声学和原子力显微镜相结合的扫描探针声学显微技术(Atomic Force Acoustic Microscopy,AFAM)是近年来发展的一项定量化纳米力学测试方法,具有高分辨和无损的优势.论文围绕AFAM这一测试技术,首先详细论述了AFAM弹性力学性能和粘弹性力学性能定量化测试的基本原理以及两种成像模式;随后对AFAM方法研究相关的进展进行了分析和归纳;接着对AFAM在纤维增强复合材料、智能材料、生物材料、纳米材料和薄膜中的应用进展进行了综述;最后对AFAM进行了总结和展望.

关键词：纳米力学原子力显微镜悬臂梁接触共振粘弹性

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多模态原子力显微术研究进展

固体力学学报 2022年第5期43卷 519-540页

作者：周锡龙黄震阳李法新山东科技大学能源与矿业工程学院青岛266590 武汉理工大学理学院武汉430070 北京大学工学院北京100871

材料纳米尺度的各种性能中,纳米力学性能是纳米材料和器件服役所需要保证的最基本性能.因此,发展可靠的定量化纳米力学测试技术就显得尤为关键.原子力显微镜(Atomic Force Microscope,AFM)作为纳米力学测试的重要平台,目前广泛应用于材... 详细信息

材料纳米尺度的各种性能中,纳米力学性能是纳米材料和器件服役所需要保证的最基本性能.因此,发展可靠的定量化纳米力学测试技术就显得尤为关键.原子力显微镜(Atomic Force Microscope,AFM)作为纳米力学测试的重要平台,目前广泛应用于材料纳米尺度形貌和力学性能成像.作为原子力显微术的前沿应用模式之一,多模态原子力显微术通过同时激励探针的两个或多个振动模态对样品进行测试或成像,可实现对被测样品高分辨率、高灵敏度、定量化和无损的纳米力学快速成像及检测,具有极其广泛的应用前景.围绕多模态原子力显微术,首先介绍了多模态原子力显微术的基本成像原理和力学模型基础.随后,综述了多模态原子力显微术探针动力学以及成像技术相关研究的主要进展.然后,对多模态原子力显微术的几类典型应用进行了总结和评述.最后,对多模态原子力显微术未来可能的研究方向进行了展望.

关键词：原子力显微术纳米力学测试微悬臂梁多模态

钻芯试验及DCP研究在沥青路面维修中的应用

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施工技术 2016年第5期45卷 77-80页

作者：周喜龙朱远辉中交第二公路勘察设计研究院有限公司湖北武汉430056 中建三局第一建设工程有限责任公司基础设施工程分公司湖北武汉430056

介绍了以现场钻芯试件观察沥青混凝土历年加铺厚度与其各层破坏情况,并分析了各层加铺材料性质;同时,以DCP试验值量测下基层及路基土壤强度作为评估道路破坏是否由下基层所致。从旧有路面钻芯试件探讨了沥青混凝土加铺质量,以提供工程... 详细信息

介绍了以现场钻芯试件观察沥青混凝土历年加铺厚度与其各层破坏情况,并分析了各层加铺材料性质;同时,以DCP试验值量测下基层及路基土壤强度作为评估道路破坏是否由下基层所致。从旧有路面钻芯试件探讨了沥青混凝土加铺质量,以提供工程界路面维护的参考。

关键词：公路工程沥青混凝土路面加铺设计钻芯厚度