Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 23: Catalysis and surface reactions – Poster

O 23.6: Poster

Montag, 9. März 2026, 18:00–20:00, P2

Structural development of new defective titanium carbon phosphorus hybrid composites by soft x-ray spectroscopy — •Hesham Hamad — City of Scientific Research and Technological Applications, Alexandria, Egypt — Elettra Sincrotrone Trieste, Trieste, Italy

The discovery of "black" TiO2 nanoparticles with enhanced solar absorption in the visible and near-infrared regions has sparked growing interest in solar energy applications. However, their properties remain incompletely understood. In this work, we explore a sustainable defective titanium*carbon*phosphorous (TCPH) hybrid nanocomposite for photocatalytic applications. TCPH was synthesized and applied in the degradation of methyl orange (MO) dye, a model organic pollutant. Characterization revealed the presence of Ti3+ species, oxygen vacancies, and a core-shell structure, along with a significant increase in surface area. These features enhance charge transport and separation, leading to excellent photocatalytic activity. X-ray photoelectron spectroscopy (XPS) confirmed the Ti3+ modifications in TCPH. To further probe its properties, synchrotron-based X-ray absorption fine structure (XAFS) spectroscopy was employed. This advanced technique provides insights into unoccupied and occupied states, particularly the O 2p and Ti 3d hybrid orbitals, revealing the electronic and crystalline structures of anatase, rutile, Ti metal, and TCPH. The combination of XAFS with complementary methods, including XRD, XPS, and HRTEM, enables a comprehensive understanding of TCPH's morphology, crystallinity, and local electronic structure.

Keywords: Coloured carbon titanium-phosphorous composites; Oxygen vacancy; XAFS; Soft X-ray Beamline; Photocatalysis