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Chemical stability of plasmon-active silver tips for tip-enhanced Raman spectroscopy

Jana Kalbacova
  • Corresponding author
  • Semiconductor Physics, Technische Universität Chemnitz, Chemnitz, 09107, Germany
  • Center for Advancing Electronics Dresden (cfaed), Technische Universität Chemnitz, Chemnitz, 09107, Germany
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/ Raul D. Rodriguez
  • Corresponding author
  • Semiconductor Physics, Technische Universität Chemnitz, Chemnitz, 09107, Germany
  • Center for Advancing Electronics Dresden (cfaed), Technische Universität Chemnitz, Chemnitz, 09107, Germany
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/ Vivek Desale
  • Corresponding author
  • Semiconductor Physics, Technische Universität Chemnitz, Chemnitz, 09107, Germany
  • Other articles by this author:
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/ Maximilian Schneider
  • Corresponding author
  • Department Chemie, Professur für Makromolekulare Chemie, Technische Universität Dresden, Dresden, 01069, Germany
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  • De Gruyter OnlineGoogle Scholar
/ Ihsan Amin
  • Corresponding author
  • Department Chemie, Professur für Makromolekulare Chemie, Technische Universität Dresden, Dresden, 01069, Germany
  • Center for Advancing Electronics Dresden (cfaed), Technische Universität Chemnitz, Chemnitz, 09107, Germany
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/ Rainer Jordan
  • Corresponding author
  • Department Chemie, Professur für Makromolekulare Chemie, Technische Universität Dresden, Dresden, 01069, Germany
  • Center for Advancing Electronics Dresden (cfaed), Technische Universität Chemnitz, Chemnitz, 09107, Germany
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/ Dietrich R.T. Zahn
  • Corresponding author
  • Semiconductor Physics, Technische Universität Chemnitz, Chemnitz, 09107, Germany
  • Center for Advancing Electronics Dresden (cfaed), Technische Universität Chemnitz, Chemnitz, 09107, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2015-01-09 | DOI: https://doi.org/10.2478/nansp-2014-0002

Abstract

Silver nanostructures are used in tip- and surface-enhanced Raman spectroscopy due to their high electric field enhancement over almost the entire visible spectral range. However, the low chemical stability of silver, compared to other noble metals, promotes silver sulfide and sulfate formation which decreases its plasmonic activity. This is why silver tips are usually prepared on the same day of the experiments or are disregarded in favour of gold that is chemically more stable. Since silver degradation cannot be avoided, we hypothesized that a protection layer may be able to minimize or control degradation. In this contribution, we report the successful preparation of 4-biphenylthiol and 4’-nitro-4-biphenylthiol self-assembled monolayers on silver tips in order to protect them against tarnishing and to investigate the effect on the life-time of the plasmonic activity. The electrochemically etched wire surface was probed via Raman spectroscopy and scanning electron microscopy. The best long term stability and resistance against corrosion was shown by a monolayer of 4-biphenylthiol formed from dimethylformamide which did not display any degradation of the metallic tip during the observed period. Here, we demonstrate an easy and straightforward approach towards increasing the chemical stability of silver TERS-active probes.

Keywords: Silver probes; SAM; Raman spectroscopy; scanning electron microscopy; tip-enhanced Raman spectroscopy; apertureless SNOM probes

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About the article

Received: 2014-06-23

Accepted: 2014-11-03

Published Online: 2015-01-09


Citation Information: Nanospectroscopy, Volume 1, Issue 1, ISSN (Online) 2300-3537, DOI: https://doi.org/10.2478/nansp-2014-0002.

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© 2014 Jana Kalbacova et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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