Facile fabrication of uniaxial nanopatterns on shape memory polymer substrates using a complete bottom-up approach

Zhongbi Chen, Sridhar Krishnaswamy*

*Corresponding author for this work

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

Abstract

In earlier work, we have demonstrated an assisted self-assembly fabrication method for unidirectional submicron patterns using pre-programmed shape memory polymers (SMP) as the substrate in an organic/inorganic bilayer structure. In this paper, we propose a complete bottom-up method for fabrication of uniaxial wrinkles whose wavelength is below 300 nm. The method starts with using the aforementioned self-assembled bi-layer wrinkled surface as the template to make a replica of surface wrinkles on a PDMS layer which is spin-coated on a pre-programmed SMP substrate. When the shape recovery of the substrate is triggered by heating it to its transition temperature, the substrate has been programmed in such a way that it shrinks uniaxially to return to its permanent shape. Consequently, the wrinkle wavelength on PDMS reduces accordingly. A subsequent contact molding process is carried out on the PDMS layer spin-coated on another pre-programmed SMP substrate, but using the wrinkled PDMS surface obtained in the previous step as the master. By activating the shape recovery of the substrate, the wrinkle wavelength is further reduced a second time in a similar fashion. Our experiments showed that the starting wavelength of 640 nm decreased to 290 nm after two cycles of recursive molding. We discuss the advantages and limitations of our recursive molding approach compared to the prevalent top-down fabrication methods represented by lithography. The present study is expected to o er a simple and cost-effective fabrication method of nano-scale uniaxial wrinkle patterns with the potential for large-scale mass-production.

Original languageEnglish (US)
Title of host publicationBehavior and Mechanics of Multifunctional Materials and Composites 2014
PublisherSPIE
ISBN (Print)9780819499844
DOIs
StatePublished - Jan 1 2014
EventBehavior and Mechanics of Multifunctional Materials and Composites 2014 - San Diego, CA, United States
Duration: Mar 10 2014Mar 12 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9058
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherBehavior and Mechanics of Multifunctional Materials and Composites 2014
CountryUnited States
CitySan Diego, CA
Period3/10/143/12/14

Keywords

  • self-assembly
  • shape memory polymer
  • wrinkle

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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