Towards rapid nanoscale chemical analysis using tip-enhanced Raman spectroscopy with Ag-coated dielectric tips

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Author(s) Yeo, Boon-Siang, Schmid, Thomas, Zhang, Weihua, Zenobi, Renato
Publication Type Journal Items, Publication Status: Published
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Title Towards rapid nanoscale chemical analysis using tip-enhanced Raman spectroscopy with Ag-coated dielectric tips
Author(s) Yeo, Boon-Siang
Schmid, Thomas
Zhang, Weihua
Zenobi, Renato
Journal or Series Title Analytical and bioanalytical chemistry
Volume Number 387
Issue Number 8
Start Page 2655
End Page 2662
ISSN 1618-2642
Publisher Springer
Publication Place Berlin
Publication Date 2007-00-00
Keyword(s) nanoscale chemical analysis
surface-enhanced Raman spectroscopy
tip-enhanced Raman spectroscopy
refractive index
surface plasmon resonance
Abstract The influence of dielectric substrates on the Raman scattering activities of Ag overlayers has been investigated. Materials with low refractive indices, such as SiO2, SiOx and AlF3, were found to provide suitable supporting platforms for Ag films to give strong surface-enhanced Raman scattering for dye molecules when illuminated at 488 nm. This finding was then extended to tip-enhanced Raman scattering (TERS). Huge enhancements of 70-80x, corresponding to net enhancements of > 10(4), were observed for brilliant cresyl blue test analyte when Ag-coated tips made from or precoated with low refractive index materials were applied. The yield of fabricated tips that significantly enhance the Raman signals was found to be close to 100%. These findings provide crucial steps towards the use of TERS as a robust technique for rapid chemical imaging with nanometer spatial resolution.
DOI 10.1007/s00216-007-1165-7
Additional Notes Received 13 December 2006, Revised 25 January 2007, Accepted 30 January 2007, Published online 28 February 2007
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03430
Organisational Unit(s)
NEBIS System Number 004239219
Source Database ID PP-34139
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  author = "Yeo, Boon-Siang and Schmid, Thomas and Zhang, Weihua and Zenobi, Renato",
  title = "{T}owards rapid nanoscale chemical analysis using tip-enhanced {R}aman spectroscopy with {A}g-coated dielectric tips",
  journal = "Analytical and bioanalytical chemistry",
  year = 2007,
  volume = "387",
  number = "8",
  pages = "2655--2662",

E-Citations record created: Thu, 01 Apr 2010, 18:34:37 CET