SKM 2023 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 45: Functional semiconductors for renewable energy solutions II
HL 45.6: Vortrag
Donnerstag, 30. März 2023, 16:45–17:00, POT 6
Tuning optical properties of graphitic carbon nitrides for photocatalytic applications — •Julian Hirschmann1, Bharati Debnath1, Matthias Kestler1, Kilian Frank2, Bert Nickel2, and Jochen Feldmann1 — 1Chair for Photonics and Optoelectronics, Nano-Institute Munich and Department of Physics, Ludwig Maximilians Universität (LMU) — 2Chair for Experimental Physics Prof. Rädler, Department of Physics, Ludwig Maximilians Universität (LMU)
In the field of photocatalysis, graphitic carbon nitrides have proven to be a promising and cost-effective material. The organic graphene like material built from heptazine or triazole rings enable various photocatalytic applications such as hydrogen evolution and ammonia production.
Graphitic carbon nitrides have a two-dimensional sheet-like structure, which is advantageous for photocatalytic applications. Our refined synthesis process provides a simple way to obtain nanosheets of different thicknesses and varying π -conjugation areas. Their impact on the optical properties such as absorption and photoluminescence are presented. The results are compared with recently published electronic band structure calculations and with more molecularly based exciton models. Finally, photocatalytic measurements have been carried out and the obtained efficiencies are compared with our data from time-integrated and time-resolved optical experiments.