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

Abstract : The detection of R6G on nanoporous susbtrates at low concentrations (10(-4) M < C < 10(-7)M) 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.
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https://hal-amu.archives-ouvertes.fr/hal-01416746
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Submitted on : Wednesday, December 14, 2016 - 5:53:36 PM
Last modification on : Tuesday, December 14, 2021 - 8:42:06 AM

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D. Fernand, David Bergé-Lefranc, C. Pardanaud, T.N.T. Phan, A. Merlen, et al.. Detection of Rhodamine 6G at low concentrations using Raman Spectroscopy: A comparison between Ag and Au-based nanoporous substrates. The European Physical Journal. Special Topics, EDP Sciences, 2015, 224 (9), pp.2001 - 2010. ⟨10.1140/epjst/e2015-02517-5⟩. ⟨hal-01416746⟩

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