Near-field heating, annealing, and signal loss in tip-enhanced Raman spectroscopy

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Author(s) Zhang, Weihua, Schmid, Thomas, Yeo, Boon-Siang, Zenobi, Renato
Publication Type Journal Items, Publication Status: Published
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Title Near-field heating, annealing, and signal loss in tip-enhanced Raman spectroscopy
Author(s) Zhang, Weihua
Schmid, Thomas
Yeo, Boon-Siang
Zenobi, Renato
Journal or Series Title The journal of physical chemistry. C
Volume Number 112
Issue Number 6
Start Page 2104
End Page 2108
ISSN 1932-7447
1932-7455
Publisher American Chemical Society
Publication Place Washington, DC
Publication Date 2008
Abstract We studied the morphological changes of “hot” spots in gap-mode tip-enhanced Raman spectroscopy (TERS) experiments by monitoring both the Raman spectra and topographic images of amorphous Au surfaces that were covered with a benzenethiol monolayer. Significant roughness reduction of the Au surfaces in the vicinity of the location of the TERS measurement together with irreversible signal loss was observed. To understand this phenomenon, a numerical simulation was performed and the result implies that it was the Joule heating generated by the highly enhanced electromagnetic field in the “hot” tip−sample nanogap that locally annealed the Au surface. Considering that the mobility of the atoms on top of an Au surface is high and the reduction of the local roughness is significant, we propose that the TERS signal loss is mainly caused by two mechanisms: reduction of electromagnetic enhancement caused by the degradation of the “hot” site and concomitant surface diffusion of the adsorbates.
DOI 10.1021/jp077457g
Additional Notes Received 17 September 2007, In Final Form 19 November 2007, Publication Date 23 January 2008
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03430
Organisational Unit(s)
NEBIS System Number 005283485
Source Database ID PP-40955
WOS-000252968100059
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@article{Zhng2008,
  author = "Zhang, Weihua and Schmid, Thomas and Yeo, Boon-Siang and Zenobi, Renato",
  title = "{N}ear-field heating, annealing, and signal loss in tip-enhanced {R}aman spectroscopy",
  journal = "The journal of physical chemistry. C",
  year = 2008,
  volume = "112",
  number = "6",
  pages = "2104--2108",
}


E-Citations record created: Thu, 01 Apr 2010, 22:43:44 CET