Surface morphology and transparency control of a metal/PDMS layered substrate by stretching

Jun Ho Oh, Ju Yeon Woo, Sunghwan Jo, Hee Min Yang, Chang Soo Han

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We report a metal/polymer layered structure to control the transparency and surface morphology by applying strain. After a thin metal layer is coated on a PDMS substrate, the applied strain causes the micropattern on the surface to buckle owing to the difference in the elastic modulus between the metal and PDMS. When we start stretching the layered structure, the micropattern on the substrate is formed perpendicular to the direction of strain. As the substrate is stretched, the micropattern becomes wider and the substrate changes from opaque to transparent. When we stretched the substrate further by approximately 80% or more, the second buckling caused an additional micropattern in the direction of the strain. Consequently, the substrate became opaque again. We determined the mechanism based on the micropattern image and light diffraction analysis. These micropatterns change the sliding behavior of a water droplet on a slanted substrate. Moreover, the sliding speed of the water droplets was determined by the elongation rate of the substrate. We demonstrate a smart window to control the transparency and sliding speed of a water droplet using our bilayer substrate along with stretching.

Original languageEnglish
Article number101732
JournalSurfaces and Interfaces
Publication statusPublished - 2022 Apr

Bibliographical note

Funding Information:
This work was supported by Korea University Grants and National Research Foundation of Korea (NRF) grants funded by the Korea Government ( 2021R1A2B5B03001811 and 2021R1A2C1010039 ).

Publisher Copyright:
© 2022 Elsevier B.V.


  • Buckling
  • Layered structure
  • Metal/PDMS
  • Smart window
  • Transmittance modulation

ASJC Scopus subject areas

  • General Chemistry
  • Condensed Matter Physics
  • General Physics and Astronomy
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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