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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Poster Session II
CPP 49.32: Poster
Dienstag, 17. März 2020, 14:00–16:00, P1A
Light-Induced Electron Transfer in the MOF-Based Noble-Metal-Free Photocatalyst Ni/CdS@MIL-101 as Studied with Fluorescence Lifetime Imaging Microscopy (FD-FLIM) — Sebastian Feulner1, •Lothar Kador1, Mara Klarner2, and Rhett Kempe2 — 1University of Bayreuth, Institute of Physics, 95440 Bayreuth, Germany — 2University of Bayreuth, Institute of Inorganic Chemistry, 95440 Bayreuth, Germany
Particles of the semiconductor CdS on size-optimized colloidal metal-organic framework (MOF) crystallites act as a photo-catalyst for the H2 liberation from amines. This acceptorless process is of great interest, since imine derivatives serve as intermediates to synthesize aromatic N-heterocycles which are highly desirable products for the fine chemical industry. The catalytic activity is strongly enhanced when co-catalytic Ni nanoparticles are present. We demonstrate that the photoluminescence lifetime of the CdS is shortened in the presence of Ni nanoparticles, so the improved catalytic activity can be related to electron transfer from the conduction band of the CdS to the Ni. The effect of Ni was found to be stronger than that of the noble metals Pt and Pd. The experiments were performed with a custom-built fluorescence lifetime imaging microscope operating in the frequency domain (FD-FLIM). It is based on a diode laser at 488 nm which was amplitude-modulated in the range 110 - 160 MHz. The data are evaluated with the polar-plot (or Cole-Cole plot) technique.