Anisotropic polymerization of a long-chain diacetylene derivative Langmuir-Blodgett film on a step-bunched SiO2/Si surface

Ryo Onoki, Keiji Ueno, Hiroo Nakahara, Genki Yoshikawa, Susumu Ikeda, Shiro Entani, Tetsuhiko Miyadera, Ikuyo Nakai, Hiroshi Kondoh, Toshiaki Ohta, Manabu Kiguchi, Koichiro Saiki

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Abstract

Alternating facet/terrace nanostructures were fabricated on a SiO 2 surface by step-bunching and thermal oxidation of a vicinal Si(111) substrate, and their influence upon the polymerization direction of a long-chain diacetylene derivative monolayer film was investigated by angle-dependent polarized near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. It was found that the peak intensity of the C 1s-π* transition was stronger when the electric vector plane of the incident X-ray was parallel to the direction of the periodic facet/terrace structures rather than perpendicular to them. On the contrary, a polymer film fabricated on a flat SiO2 surface showed no in-plane anisotropy of the peak intensity. These results indicate that the diacetylene groups in the diacetylene derivative monolayer are preferentially photopolymerized in the direction not across but along the periodic one-dimensional structures on the step-bunched and thermally oxidized SiO2/Si(111) surface.

Original languageEnglish
Pages (from-to)5742-5747
Number of pages6
JournalLangmuir
Volume22
Issue number13
DOIs
Publication statusPublished - 2006 Jun 20
Externally publishedYes

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Onoki, R., Ueno, K., Nakahara, H., Yoshikawa, G., Ikeda, S., Entani, S., Miyadera, T., Nakai, I., Kondoh, H., Ohta, T., Kiguchi, M., & Saiki, K. (2006). Anisotropic polymerization of a long-chain diacetylene derivative Langmuir-Blodgett film on a step-bunched SiO2/Si surface. Langmuir, 22(13), 5742-5747. https://doi.org/10.1021/la060482d