Minimally invasive characterization of covalent monolayer sheets using tip-enhanced raman spectroscopy

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Author(s) Opilik, Lothar, Payamyar, Payam, Szczerbinski, Jacek, Schütz, Andri P., Servalli, Marco, Hungerland, Tim, Schlüter, A. Dieter, Zenobi, Renato
Publication Type Journal Items, Publication Status: Published
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Title Minimally invasive characterization of covalent monolayer sheets using tip-enhanced raman spectroscopy
Author(s) Opilik, Lothar
Payamyar, Payam
Szczerbinski, Jacek
Schütz, Andri P.
Servalli, Marco
Hungerland, Tim
Schlüter, A. Dieter
Zenobi, Renato
Journal or Series Title ACS Nano
Volume Number 9
Issue Number 4
Start Page 4252
End Page 4259
ISSN 1936-0851
Publisher American Chemical Society
Publication Place Columbus, OH
Publication Date 2015
Keyword(s) Tip-enhanced Raman spectroscopy
2D polymer
Covalent monolayer
Anthracene dimerization
Abstract Synthetic covalent monolayer sheets and their subclass, twodimensional polymers are of particular interest in materials science because of their special dimensionality which renders them very different from any bulk matter. However, structural analysis of such entities is rather challenging, and there is a clear need for additional analytical methods. The present study shows how tip-enhanced Raman spectroscopy (TERS) can be performed on monomer monolayers and the covalent sheets prepared from them by [4 þ 4]-cycloaddition to explore rather complex structural and mechanistic issues. TERS is a surface analytical method that combines the high lateral resolution of scanning probe microscopy (SPM) with a greatly enhanced Raman scattering intensity. The high spatial resolution (<60 nm) and the significantly improved sensitivity (contrast factor of >4000) compared to confocal Raman microscopy provides new insights into the formation of this new and exciting material, namely significant consumption of the reactive units (anthracenes) and exclusion of the alternative [4 þ 2]-cycloaddition. Moreover, due to the high lateral resolution, it was possible to find a first spectroscopic hint for step growth as the dominant mechanism in the formation of these novel monolayer sheets. In addition, TERS was used to get first insights into the phase behavior of a comonomer mixture.
DOI 10.1021/acsnano.5b00629
Additional Notes Received for review 28 January 2015, Accepted 24 March 2015, Published online 24 March 2015
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03670
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NEBIS System Number 005422099
Source Database ID WOS-000353867000092
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  author = "Opilik, Lothar and Payamyar, Payam and Szczerbinski, Jacek and Sch{\"{u}}tz, Andri P. and Servalli, Marco and Hungerland, Tim and Schl{\"{u}}ter, A. Dieter and Zenobi, Renato",
  title = "{M}inimally invasive characterization of covalent monolayer sheets using tip-enhanced raman spectroscopy",
  journal = "ACS Nano",
  year = 2015,
  volume = "9",
  number = "4",
  pages = "4252--4259",

E-Citations record created: Tue, 19 May 2015, 07:14:16 CET