Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster: Focus: Van der Waals at soft matter interfaces: structure and dynamics
CPP 37.2: Poster
Mittwoch, 13. März 2013, 16:30–18:30, Poster C
Bimodal MUSIC Mode Atomic Force Microscopy on Polymers — •Eike-Christian Spitzner1, Christian Dietz2, and Robert Magerle1 — 1Chemische Physik, TU Chemnitz, D-09107 Chemnitz — 2Center of Smart Interfaces, TU Darmstadt, D-64287 Darmstadt
Multi-set point intermittent contact (MUSIC) mode atomic force microscopy (AFM) is based on point wise recording amplitude and phase of an AFM cantilever as the tip sample distance is reduced (APD curves). The technique emulates intermittent contact mode AFM without a feedback loop that causes artifacts in height and phase images. Here, we demonstrate multifrequency MUSIC mode AFM by simultaneous excitation of the first two eigenmodes of the cantilever. Furthermore, the frequency of the first eigenmode is kept at resonance during approach to prevent damping of the amplitude caused by attractive interactions. Thus, the attractive regime in the APD curves is suppressed. This enables a straight forward calculation of the tip indentation also on surfaces that exhibit strong attractive interactions between tip and sample. We show results for collagen fibrils in bovine tendon as well as other polymeric surfaces. Furthermore, enhanced contrast in the phase images of the second eigenmode is demonstrated.