Berlin 2008 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 10: POSTERS New Materials, Organic Semiconductors
CPP 10.5: Poster
Monday, February 25, 2008, 16:45–19:00, Poster A
Nano/micro-structure formation driven by local protonation of polymer thin films via dip-pen nanolithography — •Carsten Mädler1,2, Sailaja Chada2, Andres La Rosa2, and Mingdi Yan2 — 1Center of Nanostructured Materials and Analytics, TU Chemnitz, 09107 Chemnitz, Germany — 2Portland State University, PO Box 751, Portland OR 97207, US
While dip-pen nanolithography uses a sharp tip to anchor molecules on the substrate to form nanostructures, an alternative approach is presented here to exploit the responsiveness of the substrate. Acidic phosphate buffer molecules are delivered into ultraviolet-crosslinked films to swell the polymer material by a protonation-based mechanism. The experiment aims to provide the first demonstration of stimulating the mechanical response of polymer materials by confining protonation reaction locally and in a controlled manner. A series of experiments suggests that the structures are indeed due to swelling of the polymer. The process was studied at different dwell times and contact forces. A dependence of the structure height on the contact force was found, which is rather unusual for DPN processes.