Chemical Imaging on the Nanoscale - Top-Illumination Tip-Enhanced Raman Spectroscopy

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Author(s) Stadler, Johannes, Schmid, Thomas, Zenobi, Renato
Publication Type Journal Items, Publication Status: Published
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Title Chemical Imaging on the Nanoscale - Top-Illumination Tip-Enhanced Raman Spectroscopy
Author(s) Stadler, Johannes
Schmid, Thomas
Zenobi, Renato
Journal or Series Title Chimia
Volume Number 65
Issue Number 4
Start Page 235
End Page 239
ISSN 0009-4293
Publisher Swiss Chemical Society
Publication Place Bern
Publication Date 2011
Keyword(s) Gap-mode TERS
Nanoscale chemical analysis
Scanning tunneling microscopy
Spectroscopic imaging
Tip-enhanced Raman spectroscopy
Abstract A top illumination system for tip-enhanced Raman spectroscopy (TERS) in a gap-mode configuration is presented here, which allows chemical analysis of sample surfaces with a lateral resolution beyond the optical diffraction limit and optical detection of very small amounts of analyte molecules (down to single molecule sensitivity). The technique combines the high resolution of an STM with label-free, chemical-rich information of Raman spectra at ambient pressure. In this system, using a special geometry with illumination and detection perpendicular to the sample surface, a lateral resolution of <15 nm was achieved using low laser powers and split second acquisition times per spectrum. This was achieved due to a very high enhancement of the Raman signals in the order of 10(7) by etched metal tips, and allowed the acquisition of 64 x 64 to 200 x 200 pixels chemical Raman maps with full spectral information in every pixel within a reasonable time frame (<25 min for 64 x 64 pixels). The Raman maps give simultaneous information about localization and chemical nature of a sample with high sensitivity and high resolution.
DOI 10.2533/chimia.2011.235
Additional Notes Received 10 January 2011
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03430
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NEBIS System Number 000000830
Source Database ID WOS-000290699400009
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@article{Stdlr2011,
  author = "Stadler, Johannes and Schmid, Thomas and Zenobi, Renato",
  title = "{C}hemical {I}maging on the {N}anoscale - {T}op-{I}llumination {T}ip-{E}nhanced {R}aman {S}pectroscopy",
  journal = "Chimia",
  year = 2011,
  volume = "65",
  number = "4",
  pages = "235--239",
}


E-Citations record created: Mon, 06 Jun 2011, 06:30:39 CET