Tapping mode imaging with an interfacial force microscope
作者:
O. L. Warren,
J. F. Graham,
P. R. Norton,
期刊:
Review of Scientific Instruments
(AIP Available online 1997)
卷期:
Volume 68,
issue 11
页码: 4124-4131
ISSN:0034-6748
年代: 1997
DOI:10.1063/1.1148356
出版商: AIP
数据来源: AIP
摘要:
In their present embodiment, sensors used in interfacial force microscopy do not have the necessary mechanical bandwidth to be employed as free-running tapping mode devices. We describe an extremely stable method of obtaining tapping mode images using feedback on the sensor. Our method is immune to small dc drifts in the force signal, and the prospect of diminishing the risk of damaging fragile samples is realized. The feasibility of the technique is demonstrated by our imaging work on a Kevlar fiber-epoxy composite. We also present a model which accounts for the frequency dependence of the sensor in air when operating under closed loop control. A simplified force modulation model is investigated to explore the effect of contact on the closed loop response of the sensor. ©1997 American Institute of Physics.
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