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Transition metal oxides such as TiO2 and CeO2 are wide bandgap semiconductors with photocatalytic properties used to drive electrical currents and enhance electrochemical reactions. The utility of wide bandgap semiconductors can be extended from the UV and into the visible by embedding metal nanoparticles into the semiconductor. Excitation of localized surface plasmon resonances in the metal nanoparticle generates free electrons that can be injected into the semiconductor and extend the photoactivity range using lower energy photons. In this work, ultrafast transient absorption spectroscopy is used to investigate the hot electron injection from Cu nanoparticles photodeposited onto a CeO2 aerogel.
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Tara Michael, Travis Novak, Paul A. DeSario, Debra R. Rolison, Jeffrey C. Owrutsky, Vanessa M. Breslin, Adam D. Dunkelberger, "Ultrafast dynamics of electron injection from Cu embedded nanoparticles in CeO2 aerogels," Proc. SPIE PC12419, Ultrafast Phenomena and Nanophotonics XXVII, (15 March 2023); https://doi.org/10.1117/12.2650095