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静电力显微镜(electrostatic force microscopy,EFM)具有较高的灵敏度和空间分辨率,在新能源材料静电性质的测量中被广泛应用.时间分辨静电力显微镜技术主要用于材料的动态电学性质测量,该技术中常用的泵浦探测方法存在设备装置复杂、成本昂贵、测量存在不确定性等问题.本文采用直接时域测量方法,减小了测量的实现复杂度,通过应用多频激励或者激励悬臂高阶模态的方法实现了EFM多种参数同时测量和时间分辨率的提高,达到了微秒级的时间分辨率,并应用小波变换对测量得到的探针信号进行分析,实现了对材料动态电学性质的提取.通过应用该技术进行仿真实验,实现了对模拟样品电势衰减过程中的动态电势变化和模拟电池放电过程中的离子运动特征时间等性质的测量. 相似文献
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The periodic impact force induced by tip-sample contact in
tapping mode atomic force microscope (AFM) gives rise to
non-harmonic response of a micro-cantilever. These non-harmonic
signals contain the full characteristics of tip-sample interaction.
A complete theoretical model describing the dynamical behaviour of
tip--sample system was developed in this paper. An analytic formula
was introduced to describe the relationship between time-varying
tip--sample impact force and tip motion. The theoretical analysis
and numerical results both show that the time-varying tip--sample
impact force can be reconstructed by recording tip motion. This
allows for the reconstruction of the characteristics of the
tip--sample force, like contact time and maximum contact force. It
can also explain the ability of AFM higher harmonics imaging in
mapping stiffness and surface energy variations. 相似文献
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ArangementsofSemicirclesonS1LiYingzi(李英姿)DingRen(丁仁)(Dept.ofMath.,HebeiTeachers’University,Shijiazhuang,Hebei,050016)Communic... 相似文献
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