Nanoscale Probing of a Polymer-Blend Thin Film with Tip-Enhanced Raman Spectroscopy

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Author(s) Yeo, Boon-Siang, Amstad, Esther, Schmid, Thomas, Stadler, Johannes, Zenobi, Renato
Publication Type Journal Items, Publication Status: Published
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Title Nanoscale Probing of a Polymer-Blend Thin Film with Tip-Enhanced Raman Spectroscopy
Author(s) Yeo, Boon-Siang
Amstad, Esther
Schmid, Thomas
Stadler, Johannes
Zenobi, Renato
Journal or Series Title Small
Volume Number 5
Issue Number 8
Start Page 952
End Page 960
ISSN 1613-6810
Publisher Wiley-VCH
Publication Place Weinheim
Publication Date 2009
Keyword(s) AFM
surface analysis
thin films
tip-enhanced Raman spectroscopy
Abstract Fundamental advances have been made in the spatially resolved chemical analysis of polymer thin films. Tip-enhanced Raman spectroscopy (TERS) is used to investigate the surface composition of a mixed polyisoprene (PI) and polystyrene (PS) thin film. High-quality TER spectra are collected from these nonresonant Raman-active polymers. A wealth of structural information is obtained, some of which cannot be acquired with conventional analytical techniques. PI and PS are identified at the surface and subsurface, respectively. Differences in the band intensities suggest strongly that the polymer layers are not uniformly thick, and that nanopores are present under the film surface. The continuous PS subsurface layer and subsurface nanopores have hitherto not been identified. These data are obtained with nanometer spatial resolution. Confocal far-field Raman spectroscopy and X-ray photoelectron spectroscopy are employed to corroborate some of the results. With routine production of highly enhancing TERS tips expected in the near future, it is predicted that TERS will be of great use for the rigorous chemical analysis of polymer and other composite systems with nanometer spatial resolution.
DOI 10.1002/smll.200801101
Additional Notes Received 29 July 2008, Revised 1 December 2008, Published online 4 March 2009
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03430
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NEBIS System Number 004957750
Source Database ID PP-49093
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  author = "Yeo, Boon-Siang and Amstad, Esther and Schmid, Thomas and Stadler, Johannes and Zenobi, Renato",
  title = "{N}anoscale {P}robing of a {P}olymer-{B}lend {T}hin {F}ilm with {T}ip-{E}nhanced {R}aman {S}pectroscopy",
  journal = "Small",
  year = 2009,
  volume = "5",
  number = "8",
  pages = "952--960",

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