271105 Glad Sculptured Thin Films Functionalized with Polymer Brushes

Tuesday, October 30, 2012: 4:25 PM
Butler East (Westin )
Tadas Kasputis1, Meike Koenig2, Daniel Schmidt3, Klaus-Jochen Eichhorn2, Petra Uhlmann2, Mathias Schubert3, Manfred Stamm2 and Angela K. Pannier1, (1)Biological Systems Engineering, University of Nebraska-Lincoln, Lincoln, NE, (2)Leibniz Institute of Polymer Research , Dresden, Germany, (3)Electrical Engineering, University of Nebraska - Lincoln, Lincoln, NE

GLAD Sculptured Thin Films Functionalized with Polymer Brushes

Tadas Kasputis1,5, Meike Koenig2, Daniel Schmidt3,5, Klaus-Jochen Eichhorn2, Petra Uhlmann2, Mathias Schubert3,4,5, Manfred Stamm2, Angela K. Pannier1,4,5

1Department of Biological Systems Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA

2Leibniz Institute of Polymer Research Dresden, Hohe Straµe 6, 01069 Dresden, Germany

3Department of Electrical Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA

4Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Lincoln, NE 68588, USA

5Center for Nanohybrid Functional Materials, University of Nebraska-Lincoln, Lincoln, NE 68588, USA

Abstract

The development of stimuli-responsive surface coatings has been the subject of many investigations in the recent past. Polymer brushes, consisting of polymeric macromolecules tethered on one end to an underlying substrate, are regarded as very promising candidates because these systems are capable of responding to external stimuli such as temperature or pH, generally by reversible swelling-deswelling behavior. Another major focus of modern material science and engineering is the fabrication of three-dimensional nanostructures possessing tunable intricate features such as porosity, surface roughness, and surface chemistry. In this study, nanostructures with slanted columnar surface morphologies were functionalized with polymer brushes to fabricate a dual featured surface in which the intercolumnar spaces of the nanostructures are filled with polymer brushes. Specifically, the nanostructures were fabricated by glancing angle deposition (GLAD) of silicon onto gold. Guiselin polymer brushes, consisting of polyacrylic acid were reacted to the slanted columns by a grafting-to approach using a poly(glycidymethacrylate) anchoring layer. Generalized ellipsometry (GE) was employed to characterize the fabrication of the GLAD sculptured thin film (STF) as well as the step-wise reaction of polymer brushes to the GLAD nanostructures. Furthermore, in-situ combinatorial spectroscopic ellipsometry and quartz crystal microbalance with dissipation studies were conducted to evaluate the reversible swelling characteristics of functional polymer brushes. This study demonstrates that GLAD STFs are capable of withstanding the grafting-to process. GE was also shown to be an accurate probe of monitoring hybridization of materials within complex nanostructures. Together with post-fabrication analysis, GE demonstrates that polymer brushes are successfully immobilized within the GLAD STF and that the brushes exhibit reversible swelling characteristics. These complex and tunable hybrid nanostructures with stimuli-responsive characteristics provide novel material surfaces for nanoelectronics, biotechnology, and a variety of other advanced material applications.

Fig.1: Schematic of GLAD sculptured thin films functionalized with PAA Guiselin brushes


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