Fabrication of sub-micron unidirectional patterns on SMP Substrates

Zhongbi Chen, Sridhar Krishnaswamy*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


In this paper, we demonstrate an assisted self-assembly fabrication method for unidirectional patterns using pre-programmed shape memory polymer (SMP) as the substrate in an organic/inorganic bi-layer structure. By heating the hybrid structure above the SMP's shape recovery temperature, the substrate expands because of positive CTE in one direction, while in the perpendicular direction it shrinks due to shape memory effect overpowering thermal expansion. Consequently, the metal thin film coated on the substrate is subjected to an orthogonal compression-tension stress field and forms unidirectional wavy patterns. The experimentally obtained wrinkles are well-aligned with uniform wavelength ranging from about 850 nm to 1.5 μm corresponding to various programming strains and film thicknesses. A parametric study was carried out to study the influence of programming strain and film thickness on wrinkle wavelength. It was found that both the decrease of programming strain and the increase of film thickness can result in a longer wavelength. The present study is expected to offer a convenient and simple path of fabricating unidirectional wavy patterns.

Original languageEnglish (US)
Title of host publicationBehavior and Mechanics of Multifunctional Materials and Composites 2012
StatePublished - 2012
EventBehavior and Mechanics of Multifunctional Materials and Composites 2012 - San Diego, CA, United States
Duration: Mar 12 2012Mar 15 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherBehavior and Mechanics of Multifunctional Materials and Composites 2012
Country/TerritoryUnited States
CitySan Diego, CA


  • Anisotropic patterns
  • Self-assembly
  • Shape memory polymer (SMP)
  • Thin film

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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