Numerical analysis of vibration modes of a qPlus sensor with a long tip

Beilstein Journal of Nanotechnology

article

Kebei Chen¹  Zhenghui Liu²  Yuchen Xie²  Chunyu Zhang²  Gengzhao Xu²  Wentao Song²  Ke Xu² 

[1] School of Nano Technology and Nano Bionics, University of Science and Technology of China;Platform for Characterization and Test, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences;CAS Key Laboratory of Nanophotonic Materials and Devices, Suzhou Institute of Nano-Tech and Nano-Bionics

关键词: finite element method;    long tilted tip;    noncontact atomic forcemicroscopy;    qPlus sensor;    quartz tuning fork;    simulations;   

DOI  :  10.3762/bjnano.12.7

学科分类：环境监测和分析

来源: Beilstein - Institut zur Foerderung der Chemischen Wissenschaften

【 摘 要 】

We study the oscillatory behavior of qPlus sensors with a long tilted tip by means of finite element simulations. The vibrationmodes of a qPlus sensor with a long tip are quite different from those of a cantilever with a short tip. Flexural vibration of the tungsten tip will occur. The tip can no longer be considered as a rigid body that moves with the prong of the tuning fork. Instead, itoscillates both horizontally and vertically. The vibration characteristics of qPlus sensors with different tip sizes were studied. Anoptimized tip size was derived from obtained values of tip amplitude, ratio between vertical and lateral amplitude components,output current, and quality factor. For high spatial resolution the optimal diameter was found to be 0.1 mm.

【 授权许可】

CC BY