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UP: Fachverband Umweltphysik

UP 8: Poster

UP 8.1: Poster

Mittwoch, 11. März 2026, 15:00–17:00, P1

Defect-Driven Photoluminescence Quenching in WO3 Micro-Flakes: A simple approach for Bisphenol A Detection — •Hamood Al Shidhani¹, Sumesh Pillai¹, Basim Al Farsi¹, Zainab Al Ruqaishi², and Abey Issac¹ — ¹Department of Physics, College of Science, Sultan Qaboos University, P.O Box 36, Al Khoud, Muscat, PC 123, Oman. — ²Department of Chemistry, College of Science, Sultan Qaboos University, P.O Box 36, Al Khoud, Muscat, PC 123, Oman.

This study presents a novel approach utilizing photoluminescence (PL) spectroscopy of tungsten trioxide (WO*) micro-flakes to detect Bisphenol A(BPA). The WO* was synthesized via a solution phase route, with enhanced sensitivity achieved through controlled annealing. The annealing process increases oxygen vacancy concentrations, which are directional-dependent within the crystal lattice. These vacancies act as emission centers, whose PL response is modulated by BPA concentrations, resulting in measurable quenching effects. The method achieves a detection limit of 0.025 μmol/L, demonstrating sensitivity comparable to other complex analytical techniques, while offering advantages in simplicity and real-time monitoring. The underlying quenching mechanism involves electron transfer from oxygen vacancies to BPA*s H* ions, confirming a static quenching pathway. This work provides an efficient and practical platform for environmental and health monitoring of biohazardous molecules.

Keywords: Tungsten oxide (WO3); Charge transfer levels (CTL); Oxygen vacancies; Photoluminescence (PL); Bisphenol A (BPA)