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Tailoring Ordered Wrinkle Arrays for Tunable Surface Performances by Template-Modulated Gradient Films.

Senjiang Yu1, Yongjie Guo1, Huihua Li1

  • 1Key Laboratory of Novel Materials for Sensor of Zhejiang Province, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, P. R. China.

ACS Applied Materials & Interfaces
|February 22, 2022
PubMed
Summary

Researchers developed a facile method to create controllable heterogeneous wrinkles in gradient metal films. These ordered wrinkle arrays can tune surface properties like friction, advancing fabrication techniques.

Keywords:
PDMScopper grid templatefrictionheterogeneous wrinklestressthickness-gradientthin film

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Nanotechnology

Background:

  • Complex wrinkled microstructures are common in nature and biological systems.
  • Homogeneous wrinkles in film-substrate bilayers are well-studied, but controllable heterogeneous wrinkles remain a challenge.

Purpose of the Study:

  • To report a facile method for fabricating controllable heterogeneous wrinkles in template-modulated thickness-gradient metal films.
  • To analyze the morphology and formation mechanism of these heterogeneous wrinkles.
  • To demonstrate control over surface performances through engineered wrinkle arrays.

Main Methods:

  • Sputter deposition of metal films on polydimethylsiloxane (PDMS) substrates with thickness gradients.
  • Utilizing template modulation to control film thickness and induce heterogeneous wrinkling.
  • Analyzing stress distribution and its relation to wrinkle formation.
  • Adjusting deposition time, template period, shape, and lifting height to achieve ordered wrinkle arrays.

Main Results:

  • Stress in the gradient film is position-dependent, localizing wrinkles in thinner regions.
  • Ordered wrinkle arrays were successfully fabricated by tuning deposition and template parameters.
  • Surface properties, such as friction, were effectively controlled by the generated wrinkle arrays.

Conclusions:

  • The study presents a controllable method for fabricating heterogeneous wrinkles in gradient films.
  • Understanding the stress-dependent mechanism facilitates the design of complex surface topographies.
  • This work enables the controllable fabrication of various wrinkle arrays for tailored surface performances.