Light-Induced Surface Patterning of Silica

Hong Suk Kang, Seungwoo Lee, Jaeho Choi, Hongkyung Lee, Jung Ki Park, Hee Tak Kim

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Manipulating the size and shape of silica precursor patterns using simple far-field light irradiation and transforming such reconfigured structures into inorganic silica patterns by pyrolytic conversion are demonstrated. The key concept of our work is the use of an azobenzene incorporated silica precursor (herein, we refer to this material as azo-silane composite) as ink in a micromolding process. The moving direction of azo-silane composite is parallel to light polarization direction; in addition, the amount of azo-silane composite movement can be precisely determined by controlling light irradiation time. By exploiting this peculiar phenomenon, azo-silane composite patterns produced using the micromolding technique are arbitrarily manipulated to obtain various structural features including high-resolution size or sophisticated shape. The photoreconfigured patterns formed with azo-silane composites are then converted into pure silica patterns through pyrolytic conversion. The pyrolytic converted silica patterns are uniformly formed over a large area, ensuring crack-free formation and providing high structural fidelity. Therefore, this optical manipulation technique, in conjunction with the pyrolytic conversion process, opens a promising route to the design of silica patterns with finely tuned structural features in terms of size and shape. This platform for designing silica structures has significant value in various nanotechnology fields including micro/nanofluidic channel for lab-on-a-chip devices, transparent superhydrophobic surfaces, and optoelectronic devices.

Original languageEnglish
Pages (from-to)9837-9848
Number of pages12
JournalACS Nano
Volume9
Issue number10
DOIs
Publication statusPublished - 2015 Sep 21
Externally publishedYes

Keywords

  • azobenzene materials
  • micro/nano silica patterning
  • photofluidization
  • pyrolytic conversion
  • silica precursor

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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