SKM 2023 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 45: Functional semiconductors for renewable energy solutions II

HL 45.7: Vortrag

Donnerstag, 30. März 2023, 17:00–17:15, POT 6

Functionalization of TiO2 thin films with gold nanoparticles aiming at plasmonic photocatalysis — •Narmina O. Balayeva^{1, 2}, Lu He¹, Dietrich R.T. Zahn^{1, 2}, and Teresa I. Madeira^{1, 2} — ¹Semiconductor Physics, Institute of Physics, Chemnitz University of Technology, Reichenhainer Str. 70, 09126 Chemnitz, Germany — ²Research Center for Materials, Architectures and Integration of Nanomembranes (MAIN), Chemnitz University of Technology, Rosenbergstraße 6, 09126 Chemnitz, Germany

Developing novel photocatalytic systems with improved charge separation that can exploit visible light is of great interest. Here, we investigated the functionalization of anatase TiO2 thin films with gold nanoparticles (Au NPs) for enhanced photocatalytic activity. The LSPR effect of Au NPs is studied by depositing them either on top of or embedding them beneath TiO2 thin films or mixing them homogeneously into the precursor solution before the films are prepared using the spin-coating technique. An amount of Au NPs relative to TiO2 (0.01 wt% -1 wt%) was employed to study the effect of photocatalytic degradation of acetone using an FTIR-based gas photo-reactor chamber with a set of 6 cool white light-emitting diodes (LED). The structure and morphology of the Au/TiO2 films were characterized with different techniques, i.e., Raman spectroscopy and X-ray diffraction (XRD), X-ray reflectivity (XRR), scanning electron microscopy (SEM), as well as atomic force microscopy (AFM). Spectroscopic ellipsometry (SE) was used for a complementary analysis of thickness, roughness, and, in addition, dielectric properties of the thin films.