A Plate-Like Sensor for the Identification of Sample Viscoelastic Properties Using Contact Resonance Atomic Force Microscopy
A Plate-Like Sensor for the Identification of Sample Viscoelastic Properties Using Contact Resonance Atomic Force Microscopy
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DOI：
10.1115/1.4049538
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发表时间：
2021-07
期刊：
影响因子：
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通讯作者：
M. Aureli;R. Tung
中科院分区：
文献类型：
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作者：
M. Aureli;R. Tung
在这篇文章中，我们提出了一种新的接触共振原子力显微镜为基础的方法，利用一个正方形，板状微传感器，以准确地估计粘弹性样品的属性。基于Rayleigh-Ritz方法和一个“非常规”广义特征值问题给出了理论推导，并设计了一个数值实验来验证该方法。我们提出了一个更新的灵敏度准则，允许用户，给定一组测量的接触本征频率和模态阻尼比，选择最佳的本征频率准确的数据估计。验证结果，然后提出和讨论。结果表明，所提出的方法在很宽的无量纲样本刚度和阻尼值范围内的粘弹性性能的识别非常好。
In this article, we present a new contact resonance atomic force microscopy-based method utilizing a square, plate-like microsensor to accurately estimate viscoelastic sample properties. A theoretical derivation, based on Rayleigh–Ritz method and on an “unconventional” generalized eigenvalue problem, is presented and a numerical experiment is devised to verify the method. We present an updated sensitivity criterion that allows users, given a set of measured in-contact eigenfrequencies and modal damping ratios, to select the best eigenfrequency for accurate data estimation. The verification results are then presented and discussed. Results show that the proposed method performs extremely well in the identification of viscoelastic properties over broad ranges of nondimensional sample stiffness and damping values.