D Ebeling et al 2006 Nanotechnology 17 S221 doi:10.1088/0957-4484/17/7/S20
D Ebeling1,2, H Hölscher1,2, H Fuchs1,2, B Anczykowski3 and U D Schwarz4
Show affiliationsLambda phage DNA and DPPC thin films are imaged in liquids by atomic force microscopy applying the amplitude modulation mode ('tapping mode') with active enhancement of the Q-factor by a 'Q-control' electronics. The topography of the resulting images is compared with images obtained without active Q-control. To enable a meaningful comparison, individual scan lines are alternately recorded with and without Q-factor enhancement using scan parameters optimized for each mode separately. As the major finding, significant height differences of topographical features are observed between the two modes. The heights measured with active Q-control are reproducibly higher compared to the ones observed without Q enhancement. This effect is attributed to the reduction of tip–sample forces by Q-control.
87.64.Dz Scanning tunneling and atomic force microscopy
Issue 7 (14 April 2006)
Received 22 August 2005, in final form 4 December 2005
Published 10 March 2006
D Ebeling et al 2006 Nanotechnology 17 S221
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