Expanding the activity of wide bandgap semiconductors from the UV into the visible range has become a central goal for their application in green solar photocatalysis. The hybrid plasmonic/semiconductor system, based on silver nanoparticles (Ag NPs) embedded in a film of CeO2, is an example of a functional material developed with this aim. In this work, we take advantage of the chemical sensitivity of free electron laser (FEL) time-resolved soft X-ray absorption spectroscopy (TRXAS) to investigate the electron transfer process from the Ag NPs to the CeO2 film generated by the NPs plasmonic resonance photoexcitation. Ultrafast changes (<200 fs) of the Ce N4,5 absorption edge allowed us to conclude that the excited Ag NPs transfer electrons to the Ce atoms of the CeO2 film through a highly efficient electron-based mechanism. These results demonstrate the potential of FEL-based TRXAS measurements for the characterization of energy transfer in novel hybrid plasmonic/semiconductor materials.

Ultrafast Dynamics of Plasmon-Mediated Charge Transfer in Ag@CeO2 Studied by Free Electron Laser Time-Resolved X-ray Absorption Spectroscopy / Pelli Cresi, Jacopo Stefano; Principi, Emiliano; Spurio, Eleonora; Catone, Daniele; O'Keeffe, Patrick; Turchini, Stefano; Benedetti, Stefania; Vikatakavi, Avinash; D'Addato, Sergio; Mincigrucci, Riccardo; Foglia, Laura; Kurdi, Gabor; Nikolov, Ivaylo P; De Ninno, Giovanni; Masciovecchio, Claudio; Nannarone, Stefano; Kopula Kesavan, Jagadesh; Boscherini, Federico; Luches, Paola. - In: NANO LETTERS. - ISSN 1530-6984. - 21:4(2021), pp. 1729-1734. [10.1021/acs.nanolett.0c04547]

Ultrafast Dynamics of Plasmon-Mediated Charge Transfer in Ag@CeO2 Studied by Free Electron Laser Time-Resolved X-ray Absorption Spectroscopy

Pelli Cresi, Jacopo Stefano
Membro del Collaboration Group
;
Spurio, Eleonora
Membro del Collaboration Group
;
Benedetti, Stefania
Membro del Collaboration Group
;
Vikatakavi, Avinash
Membro del Collaboration Group
;
D'Addato, Sergio
Membro del Collaboration Group
;
Nannarone, Stefano
Membro del Collaboration Group
;
2021

Abstract

Expanding the activity of wide bandgap semiconductors from the UV into the visible range has become a central goal for their application in green solar photocatalysis. The hybrid plasmonic/semiconductor system, based on silver nanoparticles (Ag NPs) embedded in a film of CeO2, is an example of a functional material developed with this aim. In this work, we take advantage of the chemical sensitivity of free electron laser (FEL) time-resolved soft X-ray absorption spectroscopy (TRXAS) to investigate the electron transfer process from the Ag NPs to the CeO2 film generated by the NPs plasmonic resonance photoexcitation. Ultrafast changes (<200 fs) of the Ce N4,5 absorption edge allowed us to conclude that the excited Ag NPs transfer electrons to the Ce atoms of the CeO2 film through a highly efficient electron-based mechanism. These results demonstrate the potential of FEL-based TRXAS measurements for the characterization of energy transfer in novel hybrid plasmonic/semiconductor materials.
2021
21
4
1729
1734
Ultrafast Dynamics of Plasmon-Mediated Charge Transfer in Ag@CeO2 Studied by Free Electron Laser Time-Resolved X-ray Absorption Spectroscopy / Pelli Cresi, Jacopo Stefano; Principi, Emiliano; Spurio, Eleonora; Catone, Daniele; O'Keeffe, Patrick; Turchini, Stefano; Benedetti, Stefania; Vikatakavi, Avinash; D'Addato, Sergio; Mincigrucci, Riccardo; Foglia, Laura; Kurdi, Gabor; Nikolov, Ivaylo P; De Ninno, Giovanni; Masciovecchio, Claudio; Nannarone, Stefano; Kopula Kesavan, Jagadesh; Boscherini, Federico; Luches, Paola. - In: NANO LETTERS. - ISSN 1530-6984. - 21:4(2021), pp. 1729-1734. [10.1021/acs.nanolett.0c04547]
Pelli Cresi, Jacopo Stefano; Principi, Emiliano; Spurio, Eleonora; Catone, Daniele; O'Keeffe, Patrick; Turchini, Stefano; Benedetti, Stefania; Vikatakavi, Avinash; D'Addato, Sergio; Mincigrucci, Riccardo; Foglia, Laura; Kurdi, Gabor; Nikolov, Ivaylo P; De Ninno, Giovanni; Masciovecchio, Claudio; Nannarone, Stefano; Kopula Kesavan, Jagadesh; Boscherini, Federico; Luches, Paola
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