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A study on the mechanical properties of a carbon nanotube probe with a high aspect ratio

机译：高纵横比碳纳米管探针力学性能研究

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摘要

Carbon nanotube (CNT) probes are used in atomic force microscopes (AFMs) for high-resolution imaging, especially in the measurement of high aspect ratio micro/nano structures. Due to the use of a longer CNT tip leading to the degradation of image resolution, researchers have used several methods to cut CNTs. However, the principle of the selection of the cutting length has hardly been reported. Moreover, the influence of the effect of size on the mechanical properties of a CNT tip is not fully understood. In this study, an accurate model of finite element simulations is constructed on the basis of scanning electron microscopy data to investigate the mechanical properties of a CNT probe. An elastic model is employed to study the factors that influence the critical buckling force at the CNT tip during the measurement process. The calculation shows that the mechanical stiffness of the probe is affected by the diameter and the length-to-diameter ratio of the CNT tip. The changes in the von Mises stress at the bond between the AFM probe and the CNT tip as well as the variation of the strain energy at the CNT tip are discussed. It is hoped that this study will provide guidance for the selection of the cutting length of CNT-AFM probes and propose a basis for probe selection and design in practical measurements.
机译：碳纳米管（CNT）的探针在原子力显微镜（原子力显微镜）用于高分辨率成像，尤其是在高纵横比的微/纳米结构的测量。由于使用较长的CNT尖导致图像分辨率的退化，研究人员使用了几种方法来切断碳纳米管。然而，几乎没有被报道的切割长度的选择原则。此外，尺寸对CNT尖端的机械性能的影响的影响尚不完全清楚。在这项研究中，有限元模拟的准确模型构造扫描电子显微镜的数据来研究CNT探针的机械特性的基础上。弹性模型被用于研究其在测量过程中影响在CNT前端的临界屈曲力的因素。计算表明，探针的机械刚度由直径和长度与直径比的CNT尖端的影响。在von Mises应力在AFM探针和CNT尖端之间的结合以及变化的应变能在CNT尖端的变化进行了探讨。人们希望，这项研究将提供CNT-AFM探针的切割长度的选择指导，并提出了探头的选择和设计在实际测量的基础。

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