SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 92: Poster Session VII: Ultrafast electron dynamics at surface and interfaces III

O 92.2: Poster

Donnerstag, 4. März 2021, 10:30–12:30, P

Dynamics of charge transfer processes at nanoparticle/oxide interface studied by free electron laser — •Eleonora Spurio^{1, 2}, Jacopo Stefano Pelli Cresi³, Emiliano Principi³, Daniele Catone⁴, Patrick O'Keeffe⁴, Stefano Turchini⁴, Stefania Benedetti², Avinash Vikatakavi^{1, 2}, Sergio D'Addato^{1, 2}, Claudio Masciovecchio³, Jagadesh Kopula Kesavan⁵, Federico Boscherini⁵, and Paola Luches² — ¹Università degli Studi di Modena e Reggio Emilia — ²CNR-NANO, Modena — ³Elettra-Sincrotrone Trieste — ⁴ISM-CNR, Rome — ⁵Università di Bologna, Italy

In order to make wide band gap semiconductors suitable for a widespread use as green solar photocatalysts, it is fundamental to expand their photoactivity in the visible range. This is possible for example combining these materials with plasmonic nanoparticles(NP). In our work, we have studied a system based on Ag NP embedded in a film of CeO2. Here, we have exploited the chemical sensitivity of free electron laser time-resolved soft X-ray absorption spectroscopy to obtain information on the ultrafast energy transfer process at the NP/film interface, following photoexcitation of the plasmon resonance of Ag NP. We have observed ultrafast changes (< 200 fs) of the Ce N4,5 absorption edge, revealing a highly efficient charge transfer from Ag NP to the Ce atoms of the CeO2 film[1]. These results also demonstrate the power of this technique for the characterization of energy transfer in these novel hybrid plasmonic/semiconductor materials. [1] J. S. Pelli Cresi et al., submitted for publication (2021).