Apertureless near-field vibrational imaging of block-copolymer nanostructures with ultrahigh spatial resolution

Markus B. Raschke, Leopoldo Molina, Thomas Elsaesser, Dong Ha Kim, Wolfgang Knoll, Karsten Hinrichs

Research output: Contribution to journalArticlepeer-review

91 Scopus citations

Abstract

Nanodomains formed by microphase separation in thin films of the diblock copolymers poly(styrene-b-2-vinylpyridine) (PS-b-P2VP) and poly(styrene-b- ethyleneoxide) (PS-b-PEO) were imaged by means of infrared scattering-type near-field microscopy. When probing at 3.39 μm (2950 cm-1), contrast is obtained due to spectral differences between the C-H stretching vibrational resonances of the respective polymer constituents. An all-optical spatial resolution better than 10 nm was achieved, which corresponds to a sensitivity of just several thousand C-H groups facilitated by the local-field enhancement at the sharp metallic probe tips. The results demonstrate that infrared spectroscopy with access to intramolecular dimensions is within reach.

Original languageEnglish
Pages (from-to)2197-2203
Number of pages7
JournalChemPhysChem
Volume6
Issue number10
DOIs
StatePublished - Oct 2005

Keywords

  • Block copolymers
  • IR spectroscopy
  • Nanostructures
  • Scanning probe microscopy
  • Vibrational imaging

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