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Azo polymer microspherical cap array: soft-lithographic fabrication and photoinduced shape deformation behavior.

Bin Liu1, Yaning He, Pengwei Fan

  • 1Department of Chemical Engineering, Laboratory for Advanced Materials, Tsinghua University, Beijing, 100084, P. R. China.

Langmuir : the ACS Journal of Surfaces and Colloids
|September 21, 2007
PubMed
Summary

Researchers fabricated photoprocessible azo polymer microspherical cap arrays using soft-lithography. These arrays transform under polarized light, demonstrating photoinduced mass migration for potential microlens applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Azo polymers exhibit unique photoprocessible properties.
  • Fabrication of ordered submicrometer structures is crucial for advanced optical devices.

Purpose of the Study:

  • To develop a soft-lithographic method for creating azo polymer microspherical cap arrays.
  • To investigate the photoresponsive behavior of these fabricated arrays.

Main Methods:

  • Utilized hexagonal polystyrene (PS) colloidal arrays as masters for soft-lithography.
  • Employed Poly(dimethylsiloxane) (PDMS) stamps to transfer an epoxy-based azo polymer (BP-AZ-CA) onto substrates.
  • Applied laser irradiation (linearly polarized and interfering beams) to induce structural changes.

Main Results:

  • Successfully fabricated uniform 2D arrays of submicrometer spherical caps.
  • Demonstrated photoinduced stretching of spherical caps into ellipsoidal shapes under linearly polarized light.
  • Observed complex surface relief patterns upon irradiation with interfering laser beams, indicating photoinduced mass migration.

Conclusions:

  • The soft-lithographic contact printing approach is effective for fabricating photoprocessible azo polymer microspherical cap arrays.
  • The arrays exhibit controllable shape transformations upon polarized light exposure.
  • This technique shows potential for creating tunable microlens arrays with anisotropic optical properties.