Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 56: [DS] Progress in Micro- and Nanopatterning: Techniques and Applications III (Focused Session, jointly with O - Organisers: Graaf, Hartmann)

O 56.3: Vortrag

Mittwoch, 16. März 2011, 15:30–15:45, GER 38

Photothermal laser patterning of buried polymer interfaces — •Anja Schröter, Steffen Franzka, and Nils Hartmann — Fakultät für Chemie, CeNIDE and NETZ, Universität Duisburg-Essen, Universitätsstr. 5, 45141 Essen, Germany

Covalent attachment of polymer films provides a versatile means to taylor chemical and physical surface properties. Alternative to the approach of growing a polymer on a surface [1], here we report on a facile and flexible photothermal procedure for local grafting of thin polymer films to solid surfaces. Surface-oxidized silicon samples are coated with alkylsiloxane monolayers. After wet-chemical treatment in order to form azide-terminated monolayers a thin polymer film is spin-coated on top of the monolayer. Local irradiation with a focused beam of a diode-pumped solid-state laser at a wavelength of 532 nm thermally activates the azide groups at the buried polymer interface and leads to local covalent attachment of the polymer. Subsequently, polymer material, which is not coupled to the surface, is removed via sonication. The influence of incident laser power and irradiation time is investigated. At a 1/e focal spot diameter of 2.1 microns dots with diameters close to 1 micron can be fabricated. This procedure allows for rapid large-scale patterned attachment of a wide spectrum of polymers.

[1] M. Mathieu, A. Friebe, S. Franzka, M. Ulbricht, N. Hartmann, Langmuir 25 (2009) 12393.