SKM 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HL: Fachverband Halbleiterphysik
HL 45: Functional semiconductors for renewable energy solutions II
HL 45.4: Vortrag
Donnerstag, 30. März 2023, 15:45–16:00, POT 6
Optical and Photocatalytic Properties of BiVO4 Nanoplatelets — •Philipp Bootz1, Bharati Debnath1, Kilian Frank2, Markus Döblinger3, Bert Nickel2, Jacek Stolarczyk4, and Jochen Feldmann1 — 1Chair for Photonics and Optoelectronics, Nano-Institute Munich, Physics Department, Ludwig Maximilians Universität (LMU), 80539 Munich, Germany — 2Chair for Soft Condensed Matter, 80539 Munich, Germany — 3Chair for Functional Nanosystems (Prof. Bein), Department Physical Chemistry, 81377 Munich, Germany — 4Smoluchowski Institute of Physics, Jagiellonian University, 30-348 Krakow, Poland
Bismuth vanadate (BiVO4) with a bandgap of about 2.4 to 3.1 eV is known as one of the best water-oxidizing semiconductors in the field of photocatalysis. It is a material which can crystallize in three different phases - orthorhombic, tetragonal and monoclinic - and is often used as thin films or micron-sized crystals. In this study, we report a novel solvothermal synthesis method to obtain colloidal BiVO4 nanoplatelets with a lateral size of less than 30 nm. We have performed X-ray diffraction and transmission electron microscopy measurements for their structural characterization. We compare the linear optical properties of the nanoplatelets with their three-dimensional pendants and discuss the microscopic origins for the observed differences. Finally, we present the results of photocatalytic experiments, where a gas chromatograph is used to measure the produced oxygen from water during illumination with light.