Height anomalies in tappingmode atomic force microscopy in air caused by adhesion


Noort, S. John T. van and Werf, Kees O. van der and Grooth, Bart G. de and Hulst, Niek F. van and Greve, Jan (1997) Height anomalies in tappingmode atomic force microscopy in air caused by adhesion. Ultramicroscopy, 69 (2). pp. 117-127. ISSN 0304-3991

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Abstract:Height anomalies in tapping mode atomic force microscopy (AFM) in air are shown to be caused by adhesion. Depending o­n the damping of the oscillation the height of a sticking surface is reduced compared to less sticking surfaces. It is shown that the height artefacts result from a modulation of oscillatory movement of the cantilever. Damping and excitation of the cantilever by the driver continuously compete. As a consequence a severe modulation of the cantilever oscillation occurs, depending o­n the phase mismatch between the driver and the cantilever. Phase images of tapping a mode AFM show contrast which correlates with adhesion. Examples of a partially removed gold layer o­n mica, a Langmuir-Blodgett film and DNA show height artefacts ranging up to 10 nm.
Item Type:Article
Copyright:© 1997 Elsevier Science
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Link to this item:http://purl.utwente.nl/publications/24526
Official URL:http://dx.doi.org/10.1016/S0304-3991(97)00037-5
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