Single Molecule Tip-Enhanced Raman Spectroscopy with Silver Tips

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Author(s) Zhang, Weihua, Yeo, Boon S., Schmid, Thomas, Zenobi, Renato
Publication Type Journal Items, Publication Status: Published
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Title Single Molecule Tip-Enhanced Raman Spectroscopy with Silver Tips
Author(s) Zhang, Weihua
Yeo, Boon S.
Schmid, Thomas
Zenobi, Renato
Journal or Series Title The journal of physical chemistry. C
Volume Number 111
Issue Number 4
Start Page 1733
End Page 1738
ISSN 1932-7447
Publisher American Chemical Society
Publication Place Washington, DC
Publication Date 2007
Abstract We present single molecule tip-enhanced resonance Raman spectra from brilliant cresyl blue (BCB) submonolayers adsorbed on a planar An surface with Ag tips. A gap of 1 nm between a Ag tip and the An substrate was employed to create a highly enhanced electric field and to generate Raman scattering from an area of similar to 100 nm(2). Three lines of evidence are presented to prove the single molecule sensitivity of our experiments: (1) Extremely diluted samples were used. Estimations show that at most a few molecules were excited by the Ag tip. (2) Spectroscopic fluctuations, including intensity fluctuations, frequency shifts, and line shape changes were observed. A histogram analysis of the intensity fluctuations of two different BCB coverages was carried out. The results clearly show the features of single molecule behavior. (3) Discrete signal losses also were observed. This is because of photochemical processes involving single molecules. Besides BCB, which shows a strong resonant absorption at 633 nm (the wavelength of the excitation laser), a self-assembled monolayer of benzenethiol, which does not strongly absorb at 633 nm, was studied. Good quality spectra were recorded with a short exposure time (10 s) and time-dependent spectral changes were also observed.
DOI 10.1021/jp064740r
Additional Notes Received 25 July 2006, Revised 19 October 2006, Published online 10 January 2007
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03430
Organisational Unit(s)
NEBIS System Number 005283485
Source Database ID PP-34135
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  author = "Zhang, Weihua and Yeo, Boon S. and Schmid, Thomas and Zenobi, Renato",
  title = "{S}ingle {M}olecule {T}ip-{E}nhanced {R}aman {S}pectroscopy with {S}ilver {T}ips",
  journal = "The journal of physical chemistry. C",
  year = 2007,
  volume = "111",
  number = "4",
  pages = "1733--1738",

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