Angled long tip to tuning fork probes for atomic force microscopy in various environments
Angled long tip to tuning fork probes for atomic force microscopy in various environments
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DOI：
10.1063/1.3569765
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发表时间：
2011-04-01
影响因子：
1.6
通讯作者：
Nakayama, Tomonobu
中科院分区：
文献类型：
--
作者：
Higuchi, Seiji;Kuramochi, Hiromi;Nakayama, Tomonobu
我们通过以一定角度连接一个长金属针尖，扩展了音叉探针（TFP）在调频原子力显微镜（FM - AFM）中的应用范围。通过金属针尖和音叉臂的组合弯曲，这种TFP可以通过切换共振频率来改变可检测力的方向，这是传统短针尖TFP无法实现的。TFP针尖顶点的振动行为通过计算机模拟进行了预测，并通过扫描电子显微镜进行了实验验证。使用这种TFP的FM - AFM操作在各种环境中进行，即在超高真空、空气和水中。在空气中高定向热解石墨的原子台阶上获得的FM - AFM图像根据激发频率显示出明显差异。还发现由于水动力阻尼程度的降低，这种TFP的高阶弯曲模式有利于在水中进行FM - AFM。（C）2011美国物理学会。[doi:10.1063/1.3569765]
We expand the range of applications of a tuning fork probe (TFP) in frequency-modulation atomic force microscopy (FM-AFM) by attaching a long metal tip at a certain angle. By the combined flexure of the metal tip and the tuning fork prong, this TFP can change the direction of the detectable force by switching the resonance frequency, which has not been realized with conventional TFPs with short tips. The oscillatory behavior of the tip apex of the TFP is predicted by computer simulations and is experimentally confirmed with scanning electron microscope. FM-AFM operations using this TFP are performed in various environments, i.e., in ultrahigh vacuum, air, and water. FM-AFM images obtained at an atomic step of highly oriented pyrolytic graphite in air show a clear difference depending on the excitation frequency. It is also revealed that the higher order flexural modes of this TFP are advantageous for FM-AFM in water due to the reduction in the degree of hydrodynamic damping. (C) 2011 American Institute of Physics. [doi:10.1063/1.3569765]