468737 Photochemical Reactions on Plasmonic Metal Nanoparticles: Underlying Mechanism of Charge Extraction from Nanoparticles to Adsorbates
In this presentation, we study the flow of charge for a photo-excited plasmonic metal-adsorbate system in which the presence of the adsorbate opens a new channel for the direct, resonant flow of charge from the metal to the adsorbate. This direct transfer of charge results in the selective heating of the adsorbate molecule without exciting charge carriers in the metal thereby avoiding the heating and loss of energy to the metal nanoparticle. This suggests that the transfer of energy to adsorbates in these photo-excited metal-adsorbate systems can be very efficient. We outline a conceptual model that explains these results and close by discussing the consequences of this energy flow in plasmonic metal-adsorbate systems for applications in photocatalysis.
(1) Linic, S.; Aslam, U.; Boerigter, C.; Morabito, M. Photochemical Transformations on Plasmonic Metal Nanoparticles. Nat. Mater. 2015, 14 (6), 567–576.
(2) Boerigter, C.; Campana, R.; Morabito, M.; Linic, S. Evidence and Implications of Direct Charge Excitation as the Dominant Mechanism in Plasmon-Mediated Photocatalysis. Nat. Commun. 2016, 7, 10545.
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