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DS: Fachverband Dünne Schichten
DS 7: 2D Materials and their Heterostructures III
DS 7.8: Talk
Wednesday, March 20, 2024, 11:30–11:45, A 053
Visible-Light-Active 2D Single-Layered g-C3N4-TiO2 Thin Film Photocatalysis — •Narmina O. Balayeva1,2, Bowei Zhan1,2, Yevhenii Havryliuk1,2, Oleksandr Selyshchev1,2, and Dietrich R.T. Zahn1,2 — 1Institute of Physics, TU Chemnitz, Reichenhainer Str. 70 — 2Research Center for Materials, Architectures and Integration of Nanomembranes (MAIN), TU Chemnitz, Rosenbergstr. 6
Recently, the interest in the application of atomically thin 2D "graphene-like" layered graphitic carbon nitride (g-C3N4) for visible-light efficient photocatalysis has significantly increased. This work demonstrates the fabrication of thin film heterostructures of single-layered g-C3N4 (SLGCN) and the anatase TiO2. After obtaining SLGCN from base-assisted exfoliation of bulk g-C3N4, the films were prepared using spray coating with 1, 3, and 5 cycles on p-type Si(100) substrates. Subsequently, a colloidal TiO2 solution was deposited using spin coating and annealed at 500 ∘C to form the anatase polymorph. Secondly, the powder of SLGCN was mixed with the colloidal TiO2 solution at different relative weight percentages (5-50 wt%) and deposited using spin coating followed by the same annealing procedure. The morphology, structural, and optical properties of SLGCN and SLGCN-TiO2 are characterized by XRD, AFM, SEM, and spectroscopic techniques such as UV-vis, Raman, FTIR, and ellipsometry. Finally, the photocatalytic degradation of acetone and CO2 reduction was studied using an FTIR-based gas photo-reactor chamber equipped with 1 mW/cm2 LED with different wavelengths.
Keywords: photocatalysis; g-C3N4; TiO2; two-dimensional (2D); thin film