Study of Probe-Surface Interaction in Shear-Force Microscopy: Effects of Humidity and Lateral Spring Constant
Study of Probe-Surface Interaction in Shear-Force Microscopy: Effects of Humidity and Lateral Spring Constant
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剪切力显微镜中探针与表面相互作用的研究：湿度和横向弹簧常数的影响
DOI：
10.1007/s10043-998-0303-6
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发表时间：
1998
期刊：
影响因子：
1.2
通讯作者：
S. Hirotsu
中科院分区：
文献类型：
--
作者：
T. Okajima;S. Hirotsu
研究了玻璃探针与云母表面之间的剪切力与相对湿度H和探针的横向弹簧常数k的关系，发现相互作用长度随相对湿度H的增加而减小，在H=40%左右急剧下降。随着ink从5 N/m增加到40 N/m， dop逐渐增加，尽管使用尖端较软的探针时不存在这一特征。后者的结果表明，在大气条件下，剪切力不是一个遥远的力，而是由尖端与表面之间的某种接触产生的。我们的研究结果表明，探针的共振曲线与振动幅值无关，除了靠近表面外几乎是对称的，这与最近提出的力模型即爆震机制不一致。提出探针即使接触表面也能产生振动，并且随着接触的收紧，共振频率急剧增加。对非接触力的贡献进行了理论估计。
The shear force between a glass probe and a mica surface has been investigated as a function of the relative humidity,H, and the lateral spring constant of the probe, K. It was found that the interaction length Dodecreases with increasingHand exhibits a sharp drop aroundH=40%. With increase inKfrom 5 to 40 N/m, Dogradually increases, although this feature was absent when a probe with a softer tip-end was used. The latter result indicates that the shear force in an atmospheric condition is not a remote force but results from some contact between the tip and the surface. Our results thatDois independent of the oscillating amplitude and that the resonance curve of the probe is almost symmetric except in close vicinity to the surface are not in accord with the force model proposed recently, i.e., the knocking mechanism. It is proposed that the probe can vibrate even if the probe touches the surface, and that the resonance frequency increases steeply as the contact tightens. Theoretical estimation of the contribution of noncontact forces is also described.