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Borghetti Patrizia

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© INSP - Cécile Duflot
Postdoctoral Fellow
patrizia.borghetti gmail.com

Team Low-dimensional oxides

Individual Fellowships Marie Skłodowska-Curie Actions H2020-MSCA-IF-2014 (Project No. 658056)

OSCAR project : “Operando study of the catalytic activity of gold nanoparticles by Surface Differential Reflectivity Spectroscopy (SDRS) : from plasmonic response to morphology”

Start time : 01/04/2016
End time : 31/03/2018

The outstanding catalytic activity of gold nanoparticles (NPs) on metal-oxide supports has attracted enormous interest not only for fundamental understanding but also for the design and synthesis of a new generation of efficient catalysts. At the current time, one of the main technical challenges for gold catalyst applications is the stability in terms of sintering during use. As for many heterogeneous catalysts, the characterization of the gold NPs morphology in operating conditions is essential for progress towards practical use. The issue has been previously treated by X-ray diffraction at synchrotron radiation facilities. The present project (OSCAR) constitutes a breakthrough. It develops an optical method, namely Surface Differential Reflectivity Spectroscopy (SDRS), to determine operando at the laboratory the shape and size of NPs on the basis of their plasmonic response. The challenge is to combine non-invasive SDRS measurements for determining NP morphology to reactivity measurements in realistic conditions. The case study is the archetypal case of CO oxidation on supported gold NPs, for which the relationship between NPs size/shape and reactivity is vividly debated. The catalytic activity of gold NPs is examined on rutile TiO2(110) exposed to different annealing treatments in order to determine the crucial role played by the supporting metal-oxide substrate.


Publications

  • P. Borghetti, A. Sarasola, N. Merino-Diez, V. Guillaume, A. Arnau, J. Lobo-Checa, D. G. de Oteyza, L. Floreano, and J. E. Ortega, “Symmetry, Shape and Energy Variations in Frontier Molecular Orbitals at Organic/Metal Interfaces : The Case of 4F-TCNQ” J. Phys. Chem. C, 121 (2017) 28412. PDF
  • P. Borghetti, Y. Mouchaal, Z. Dai, G. Cabailh, S. Chenot, R. Lazzari, and J. Jupille, “Orientation-dependent band-bending and chemistry for Ti on polar ZnO surface”. Phys. Chem. Chem. Phys., 19 (2017) 10350. PDF
  • P. Borghetti, E. Meriggio, G. Rousse, G. Cabailh, R. Lazzari, J. Jupille, “Photoemission Fingerprints for Structural Identification of Titanium Dioxide Surfaces”. J. Phys. Chem. Lett., 7 (2016) 3223. PDF