Multiscale micro-patterned polymeric and carbon substrates derived from buckled photoresist films: fabrication and cytocompatibility

Kulkarni, Manish M. ; Sharma, Chandra S. ; Sharma, Ashutosh ; Kalmodia, Sushma ; Basu, Bikramjit (2012) Multiscale micro-patterned polymeric and carbon substrates derived from buckled photoresist films: fabrication and cytocompatibility Journal of Materials Science, 47 (8). pp. 3867-3875. ISSN 0022-2461

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Official URL: http://link.springer.com/article/10.1007%2Fs10853-...

Related URL: http://dx.doi.org/10.1007/s10853-011-6242-9

Abstract

We report here a novel and simple buckling-based multiscale patterning of negative photoresist films which were subsequently pyrolyzed to yield complex micro-patterned carbon surfaces. Unlike other polymers, the use of a photoresist layer allows the overall pattern definition by photolithography on which the geometry and length scale of the buckling-instability are superimposed. The photoresist film swells anisotropically during developing and buckles after subsequent drying due to the difference in the shrinkage of the hard cross-linked layer on top of a softer native pre-polymer. We studied the conditions for the formation of a wide variety of complex, fractal buckling patterns as well as directionally aligned zigzag patterns over a large area. For example, the buckling diminished for the films below a critical thickness and after a prolonged UV exposure, both of which eliminate the softer under-layer. These patterned carbon substrates are also shown to be biocompatible for the cellular adhesion and viability by using L929 mouse fibroblast cells, thus indicating their potential use in bio-MEMS platforms with a conductive substrate. The buckled carbon patterns were found to be a better choice of a substrate for cell growth and viability as compared to flat and simply periodic patterned carbon surfaces.

Item Type:Article
Source:Copyright of this article belongs to Springer-Verlag.
ID Code:96549
Deposited On:02 Jan 2013 09:00
Last Modified:02 Jan 2013 09:00

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