Investigation of copper oxidation states in plasmonic nanomaterials by XAS and Raman spectroscopy

Clémence Queffélec; Florian Forato; Bruno Bujoli; D Andrew Knight; Emiliano Fonda; Bernard Humbert

doi:10.1039/c9cp06478h

Investigation of copper oxidation states in plasmonic nanomaterials by XAS and Raman spectroscopy

Phys Chem Chem Phys. 2020 Jan 28;22(4):2193-2199. doi: 10.1039/c9cp06478h. Epub 2020 Jan 8.

Authors

Clémence Queffélec¹, Florian Forato¹, Bruno Bujoli¹, D Andrew Knight², Emiliano Fonda³, Bernard Humbert⁴

Affiliations

¹ Université de Nantes, CNRS, CEISAM, UMR 6230, F-44000 Nantes, France. clemence.queffelec@univ-nantes.fr.
² Department of Biomedical & Chemical Engineering & Sciences, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Florida 32901, USA.
³ Synchrotron SOLEIL, L'ormes des merisiers, Saint Aubin BP-48, 91192, Gif-Sur-Yvette Cedex, France.
⁴ Institut des Matériaux Jean Rouxel, CNRS-Université de Nantes, 2 rue de la Houssinière, B.P. 32229, 44322 Nantes Cedex 3, France. Bernard.Humbert@cnrs-imn.fr.

PMID: 31912830
DOI: 10.1039/c9cp06478h

Abstract

Plasmonic core-shell-isolated nanoparticles are promising nanoplatforms for photocatalysis and for low detection analysis. This paper describes the characterization of a 2,2'-bipyridine phosphonate functionalized Ag@TiO₂ nanocomposite which complexes copper ions by enhanced Raman spectroscopy and X-ray absorption (XANES and EXAFS). We distinguished Cu(i) from Cu(ii) complexes using shell-isolated nanoparticle enhanced Raman (SHINERS) combined with XAS spectroscopy.