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Rostock 2019 – scientific programme

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MO: Fachverband Molekülphysik

MO 24: Large and Reactive Systems

MO 24.4: Talk

Friday, March 15, 2019, 11:15–11:30, S HS 002 Biologie

Transient absorption spectroscopy of nanodiamonds in water: direct observation of solvated electrons — •Christoph Merschjann1, Franziska Buchner1, Benjamin Kiendl2, Amélie Venerosy3, Hugues Girard3, Jean-Charles Arnault3, Emina Hadzifejzovic4, John Foord4, Anke Krueger2, and Tristan Petit11Helmholtz-Zentrum Berlin, Germany — 2Universität Würzburg, Germany — 3CEA-LIST, Saclay, France — 4University of Oxford, United Kingdom

Nanodiamonds (ND) are promising candidates for photocatalytic transformation of CO2 to CO and organic reduction products like methanol or formic acid, as they release solvated electrons to the aqueous solution upon UV illumination. However, the nature of the electron emission process and its related dynamics are still unknown.

We investigate the ultrafast dynamics of this process using femtosecond transient absorption spectroscopy with DUV (225 nm) pump and VIS supercontinuum probe pulses. While the recombination of solvated electrons is governed by long-lived (> 2 ns) diffusion processes, NDs of different surface termination (-H, -OH, -COOH) show characteristic features in the sub-picosecond regime. We will discuss the impact of these surface terminations on the dynamics of solvated electrons, and thus on the photocatalytic performance in water. We expect that our results will support the design of efficient metal-free photocatalysts for CO2 conversion.

Financial support by the European Union’s Horizon 2020 Program (Grant Agreement no. 665085, "DIACAT") is gratefully acknowledged.

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