Liquid contact resonance AFM: analytical models, experiments, and limitations.

TitleLiquid contact resonance AFM: analytical models, experiments, and limitations.
Publication TypeJournal Article
Year of Publication2014
AuthorsZ Parlak, Q Tu, and S Zauscher
JournalNanotechnology
Volume25
Issue44
Start Page445703
Date Published11/2014
Abstract

Contact resonance AFM (CR-AFM) is a scanning probe microscopy technique that utilizes the contact resonances of the AFM cantilever for concurrent imaging of topography and surface stiffness. The technique has not been used in liquid until recently due to analytical and experimental difficulties, associated with viscous damping of cantilever vibrations and fluid loading effects. To address these difficulties, (i) an analytical approach for contact resonances in liquid is developed, and (ii) direct excitation of the contact resonances is demonstrated by actuating the cantilever directly in a magnetic field. By implementing the analytical approach and the direct actuation through magnetic particles, quantitative stiffness imaging on surfaces with a wide range of stiffness can be achieved in liquid with soft cantilevers and low contact forces.

DOI10.1088/0957-4484/25/44/445703
Short TitleNanotechnology