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Issue 12, 2008
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Complex micropatterning of periodic structures on elastomeric surfaces

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Abstract

We report a simple methodology to fabricate complex sub-micrometre periodic structures in poly(dimethylsiloxane) over large surface areas (several cm2). Single-frequency, uni- and multi-axial sinusoidal surface modulations, with tunable amplitude and wavelength, in the nano- to micrometre range, are readily demonstrated. The technique builds upon a buckling instability of a stiff layer supported by an elastomeric membrane (reported earlier), induced by surface oxidation of a pre-stretched elastomer coupon followed by removal of the applied mechanical strain. Plasma oxidation yields model surfaces with single wavelengths, sub-micrometre periodicity, achieving a dynamic range from sub-200 nm to 10s of µm, which UV ozonolysis extends to 100s of µm. We find that a single ‘dose’ parameter (exposure time × power) characterizes the surface conversion. The strain control provides unprecedented tunability of surface pattern amplitude and morphology, ranging from lines to complex periodic topologies induced under multi-axial deformation. We introduce a novel multiple strain–exposure and replication approach that extends surface topologies beyond lines, chevron and spinodal patterns (isotropic structures with a dominant wavelength). The resulting structures exhibit a glass-like surface, which is easily grafted with self-assembled monolayers to enhance functionality. Applications of this inexpensive and fast methodology include stamps for soft lithography, micromolding, templating and surface patterning.

Graphical abstract: Complex micropatterning of periodic structures on elastomeric surfaces

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Article information


Submitted
10 Jul 2008
Accepted
15 Aug 2008
First published
30 Sep 2008

Soft Matter, 2008,4, 2360-2364
Article type
Communication

Complex micropatterning of periodic structures on elastomeric surfaces

A. Chiche, C. M. Stafford and J. T. Cabral, Soft Matter, 2008, 4, 2360
DOI: 10.1039/B811817E

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