title: Ex situ and in situ characterization of patterned photoreactive thin organic surface layers using friction force microscopy.
abstract: Photolithographic methods allow an easy lateral top-down patterning and tuning of surface properties with photoreactive molecules and polymers. Employing friction force microscopy (FFM), we present here different FFM-based methods that enable the characterization of several photoreactive thin organic surface layers. First, three ex situ methods have been evaluated for the identification of irradiated and non-irradiated zones on the same organosilane sample by irradiation through different types of masks. These approaches are further extended to a time dependent ex situ FFM measurement, which allows to study the irradiation time dependent evolution of the resulting friction forces by sequential irradiation through differently sized masks in crossed geometry. Finally, a newly designed in situ FFM measurement, which uses a commercial bar-shaped cantilever itself as a noncontact shadow mask, enables the determination of time dependent effects on the surface modification during the photoreaction.
authors.affiliation: Institute of Physics, Montanuniversität Leoben, Leoben, Austria.
authors.forename: Quan
authors.initials: Q
authors.lastname: Shen
authors.forename: Matthias
authors.initials: M
authors.lastname: Edler
authors.forename: Thomas
authors.initials: T
authors.lastname: Griesser
authors.forename: Astrid-Caroline
authors.initials: AC
authors.lastname: Knall
authors.forename: Gregor
authors.initials: G
authors.lastname: Trimmel
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Kern
authors.forename: Christian
authors.initials: C
authors.lastname: Teichert
keywords: adhesion force; friction force microscopy; photolithography; photoreactive surface layers