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SERS and DFT study of indigo adsorbed on silver nanostructured surface

Nardo, Viviana Mollica, Sinopoli, Alessandro, Kabalan, Lara, Ponterio, Rosina C., Saija, Franz and Trusso, Sebastiano 2018. SERS and DFT study of indigo adsorbed on silver nanostructured surface. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 205 , pp. 465-469. 10.1016/j.saa.2018.07.059

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Surface-enhanced Raman spectroscopy has emerged as a widely used tool in the identification of organic dyes in works of art. Indigo is among the most used organic pigment, its identification can therefore give important information about the provenience and the making of the investigated work of art. In this work, we combine Surface Enhanced Raman Spectroscopy (SERS) experiments with density functional theory (DFT) computations of the Raman frequencies of indigo and an indigo molecule adsorbed onto a silver surface made of 16 silver atoms. The SERS spectrum of a molecule adsorbed on a metallic surface, in fact, can differ from the corresponding Raman one. The knowledge and the comprehension of the SERS spectrum then are mandatory in dyes identification. Experimental SERS spectra were acquired using ad hoc SERS active substrates consisting of pulsed laser ablated silver nanoparticles deposited onto a polishing sheet. The polishing sheet surface roughness is able to remove some pigments grains from the surface of a work of art without damage. DFT calculations provide a good description of the observed SERS spectra, in particular, the indigo-Ag16 structure gives a better description with respect to structures where only one or two silver atoms attached to the indigo molecule are considered.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: Elsevier
ISSN: 1386-1425
Date of Acceptance: 20 July 2018
Last Modified: 04 Mar 2021 12:00

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