Optical Reflection from Unforbidden Diffraction of Block Copolymer Templated Gyroid Films

Seungyun Jo, Taesuk Jun, Hui Il Jeon, Seunggi Seo, Hyungjun Kim, Seungwoo Lee, Du Yeol Ryu

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We present material substitutions and optical characterization of block copolymer (BCP)-templated gyroid structures that are obtained from a volume-asymmetric polystyrene-b-poly(methyl methacrylate) (PS-b-PMMA). In addition to the structural analyses reported earlier, we elucidate the optical responses to the nonaffine gyroid planes, in which the PMMA channels are complexed with Al2O3 by sequential infiltration synthesis and the organic components are further eliminated to produce an inorganic air–Al2O3 gyroid film. Grazing-incidence small-angle X-ray scattering measurements show that three-dimensional gyroid lattices are retained in both in-plane and out-of-plane directions through these material substitution processes. Our BCP-templated gyroid films respond to the middle UV wavelength from 200 to 300 nm, and peculiar optical reflectance peaks correlate with the unforbidden {110} diffraction spots. Together with the red- and blue-shifts of the reflectance peaks by the component substitutions, the air–Al2O3 gyroid structure reveals the high-amplitude spectrum due to the large refractive-index difference between channel and matrix.

Original languageEnglish
Pages (from-to)1609-1615
Number of pages7
JournalACS Macro Letters
Volume10
Issue number12
DOIs
Publication statusPublished - 2021 Dec 21

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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