SERS investigation on the adsorption and photoreaction of 4-nitroanisole in Ag hydrosols


  • Maurizio Muniz-Miranda

    Corresponding author
    1. Dipartimento di Chimica “Ugo Schiff”, Università di Firenze, Sesto Fiorentino, Italy
    2. European Laboratory for Nonlinear Spectroscopy (LENS), Sesto Fiorentino, Italy
    • Correspondence to: Maurizio Muniz-Miranda, Dipartimento di Chimica “Ugo Schiff”, Università di Firenze, Via Lastruccia 3, 50019, Sesto Fiorentino, Italy.


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  • This article is from the GISR part of the joint special issue on the European Conference on Nonlinear Optical Spectroscopy (ECONOS 2012) with Guest Editors Johannes Kiefer and Peter Radi and the II Italian Conference of the National Group of Raman Spectroscopy and Non-Linear Effects (GISR 2012) with Guest Editor Maria Grazia Giorgini.


The adsorption of 4-nitroanisole on silver colloidal nanoparticles was investigated by surface-enhanced Raman spectroscopy (SERS). Actually, the chemical binding with a metal substrate may play a role in changing the electronic structure of this molecule, which can be considered a push–pull chromophore, because an internal charge-transfer occurs between methoxy and nitrogroup. A SERS signal could be detected only in chloride-activated silver colloids, but the spectrum recorded with green-light excitation was not related to adsorbed 4-nitroanisole, but to its azoderivative, formed by photoreduction of the nitrogroup on the surface of the silver substrate. Copyright © 2013 John Wiley & Sons, Ltd.