Controlled mud-crack patterning and self-organized cracking of polydimethylsiloxane elastomer surfaces.

Abstract:

:Exploiting pattern formation - such as that observed in nature - in the context of micro/nanotechnology could have great benefits if coupled with the traditional top-down lithographic approach. Here, we demonstrate an original and simple method to produce unique, localized and controllable self-organised patterns on elastomeric films. A thin, brittle silica-like crust is formed on the surface of polydimethylsiloxane (PDMS) using oxygen plasma. This crust is subsequently cracked via the deposition of a thin metal film - having residual tensile stress. The density of the mud-crack patterns depends on the plasma dose and on the metal thickness. The mud-crack patterning can be controlled depending on the thickness and shape of the metallization - ultimately leading to regularly spaced cracks and/or metal mesa structures. Such patterning of the cracks indicates a level of self-organization in the structuring and layout of the features - arrived at simply by imposing metallization boundaries in proximity to each other, separated by a distance of the order of the critical dimension of the pattern size apparent in the large surface mud-crack patterns.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Seghir R,Arscott S

doi

10.1038/srep14787

subject

Has Abstract

pub_date

2015-10-06 00:00:00

pages

14787

issn

2045-2322

pii

srep14787

journal_volume

5

pub_type

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