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The European Physical Journal Special Topics

, Volume 224, Issue 9, pp 2001–2010 | Cite as

Detection of Rhodamine 6G at low concentrations using Raman Spectroscopy: A comparison between Ag and Au-based nanoporous substrates

  • D. Fernand
  • D. Bergé-Lefranc
  • C. Pardanaud
  • T.N.T. Phan
  • A. Merlen
  • V. Hornebecq
Regular Article
Part of the following topical collections:
  1. Advances in Design and Modeling of Porous Materials

Abstract

The detection of R6G on nanoporous susbtrates at low concentrations (10−4 M < C < 10−7M) was studied coupling its thermodynamic adsorption properties and its Raman response. Two susbtrates were used, they consist in a mesoporous silica matrix in which Ag or Au nanoparticles are incorporated. From a thermodynamic point of view, it was evidenced, using adsorption isotherms and enthalpies, that R6G presents a higher affinity towards Ag@SiO2 than Au@SiO2. Furthermore, for C >1.10−6 M, it was evidenced that R6G Raman response does not depend on metal chemical nature. It is linearly correlated to R6G adsorbed amounts, evidencing the pre-concentration property of the substrates. For lower concentrations, differences were observed in Raman responses. For C = 1.10−6 M, the Raman bands of R6G adsorbed on SiO2 and Au@SiO2 are similar to those found at higher concentrations. For Ag@SiO2, two new bands, corresponding to bending modes of ethylamine groups, are present as well as the band related to Ag-N stretching mode. This was explained by the specific interaction developed between R6G and Ag@SiO2. For C = 1.10−7 M, only the two bands related to R6G ethylamine groups are present for all substrates and a Raman signal enhancement was found for Ag-based substrate.

Keywords

SERS European Physical Journal Special Topic Adsorbed Amount Adsorption Enthalpy Raman Response 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© EDP Sciences and Springer 2015

Authors and Affiliations

  • D. Fernand
    • 1
  • D. Bergé-Lefranc
    • 2
  • C. Pardanaud
    • 3
  • T.N.T. Phan
    • 4
  • A. Merlen
    • 5
  • V. Hornebecq
    • 1
  1. 1.Aix Marseille Université, CNRS, MADIREL UMR 7246, Centre de Saint-JérômeMarseille Cedex 20France
  2. 2.Aix Marseille Université, CNRS, IMBE, UMR 7263, Biogénotoxicologie – Santé Humaine et Environnement, Faculté de PharmacieMarseille Cedex 5France
  3. 3.Aix Marseille Université, CNRS, PIIM UMR 7345, Centre de Saint-JérômeMarseille Cedex 20France
  4. 4.Aix Marseille Université, CNRS, ICR UMR 7273, Centre de Saint-JérômeMarseille Cedex 20France
  5. 5.IM2NP, UMR 7334, Site de l’Université de Toulon – CNRSLa Garde CedexFrance

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