Tip-enhanced Raman spectroscopic imaging of patterned thiol monolayers
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Date
2011-08-30
Publication Type
Journal Article
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Abstract
Full spectroscopic imaging by means of tip-enhanced Raman spectroscopy (TERS) was used to measure the distribution of two isomeric thiols (2-mercaptopyridine (2-PySH) and 4-mercaptopyridine (4-PySH)) in a self-assembled monolayer (SAM) on a gold surface. From a patterned sample created by microcontact printing, an image with full spectral information in every pixel was acquired. The spectroscopic data is in good agreement with the expected molecular distribution on the sample surface due to the microcontact printing process. Using specific marker bands at 1000 cm−1 for 2-PySH and 1100 cm−1 for 4-PySH, both isomers could be localized on the surface and semi-quantitative information was deduced from the band intensities. Even though nanometer size resolution information was not required, the large signal enhancement of TERS was employed here to detect a monolayer coverage of weakly scattering analytes that were not detectable with normal Raman spectroscopy, emphasizing the usefulness of TERS.
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published
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Journal / series
Volume
2011 (2)
Pages / Article No.
509 - 515
Publisher
Beilstein-Institut zur Förderung der Chemischen Wissenschaften
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Subject
Mercaptopyridine; Microcontact printing; Monolayer; Spectroscopic imaging; Tip-enhanced Raman spectroscopy
Organisational unit
03807 - Dittrich, Petra / Dittrich, Petra
03430 - Zenobi, Renato / Zenobi, Renato