Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 8: Surface Reactions

O 8.6: Talk

Monday, March 18, 2024, 11:45–12:00, MA 141

Plasmon-driven/enhanced N-N and C-C coupling reactions — •Radwan M. Sarhan — Helmholtz Zentrum Berlin fur Materialien und Energie, Berlin, Germany

Plasmon-induced catalysis, driven by light and noble metals (e.g., Au, Cu, and Ag), offers a promising, ecofriendly and efficient alternative strategy to conventional thermochemistry, thereby driving chemical reactions via resonant excitation of the plasmonic nanoparticles. After excitation of the surface plasmon of the particles, energetic charge carriers (hot electrons and holes) and a high local temperature are generated, which would initiate and/or enhance chemical transformations of the adsorbed molecules. However, the exact contribution of the hot electrons and heat in the overall reaction performance and mechanism is still a hot topic. In this talk, I will present various plasmonic particles with tunable plasmon resonances (e.g., AuNRs and AuPd NRs), which have been used to achieve efficient solar-to-chemical/thermal energy conversion. In addition, I will show our recent results on different chemical reactions ranging from a reduction of small nitroaromatic molecules to more complex N-N and C-C coupling reactions (e.g., Heck reactions) that have been driven via the hot electrons or enhanced by the high local heat. Moreover, different experimental analysis will be shown to unfold the main driving force of the reaction mechanism.

Keywords: plasmonic catalysis; Hot electron; surface plasmon