Chen Kebei, Liu Zhenghui, Xie Yuchen, Zhang Chunyu, Xu Gengzhao, Song Wentao, Xu Ke
School of Nano Technology and Nano Bionics, University of Science and Technology of China, Suzhou 215123, China.
Platform for Characterization and Test, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS), Suzhou 215123, China.
Beilstein J Nanotechnol. 2021 Jan 21;12:82-92. doi: 10.3762/bjnano.12.7. eCollection 2021.
We study the oscillatory behavior of qPlus sensors with a long tilted tip by means of finite element simulations. The vibration modes 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, it oscillates both horizontally and vertically. The vibration characteristics of qPlus sensors with different tip sizes were studied. An optimized 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.
我们通过有限元模拟研究了具有长倾斜尖端的qPlus传感器的振荡行为。长尖端qPlus传感器的振动模式与短尖端悬臂的振动模式有很大不同。钨尖端会发生弯曲振动。此时不能再将尖端视为与音叉叉股一起移动的刚体。相反，它会在水平和垂直方向上振荡。研究了不同尖端尺寸的qPlus传感器的振动特性。根据获得的尖端振幅、垂直和横向振幅分量之比、输出电流和品质因数的值，得出了优化的尖端尺寸。对于高空间分辨率，发现最佳直径为0.1毫米。
