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MA: Fachverband Magnetismus

MA 42: Molecular Magnetism and Magnetic Particles / Clusters II

MA 42.10: Vortrag

Donnerstag, 12. März 2026, 12:00–12:15, HSZ/0004

Magnetic Hexagonal Nanoferrite-Based Electrode: Structural Characterization and Electrochemical Detection of Caffeine in Drinks — •Sajjad Hussain — The Begum Nusrat Bhutto Women University, Sukkur, Sindh, Pakistan

Caffeine is a pharmacologically active alkaloid that is frequently incorporated into a wide range of food and beverage formulations. V-type hexagonal ferrite nanoparticles (SrSnFe*O**-NPs) were prepared through a sol*gel-based green auto-combustion route and analyzed using a range of advanced characterization techniques, including X-ray diffraction (XRD), X-ray absorption fine structure (XAFS), scanning electron microscopy (SEM), atomic force microscopy (AFM), Brunauer*Emmett*Teller (BET) surface area analysis, and vibrating sample magnetometry (VSM). The V-type hexaferrite exhibits a single-phase crystalline structure with an average crystallite size exceeding 30 nm. The local atomic structure was confirmed using XAFS analysis, while the surface morphology and particle size were examined through SEM and AFM. BET was used to confirm the surface area 209.6 m*/g. The magnetic studies revealed soft magnetic behavior. Furthermore, the synthesized V-type hexagonal ferrites were employed to modify a glassy carbon electrode (GCE), developing SrSnFe*O**-NPs/GCE for the electrochemical sensing of caffeine. Cyclic voltammetry studies revealed conductive and diffusion-controlled behavior, with the SrSnFe*O**-NPs/GCE demonstrating high sensitivity and selectivity for caffeine detection (linear ranges: 0.5 to 80 *M; detection limits: 0.025 *M, while the LOQ was 0.078 *M.

Keywords: Green Synthesis; V-type hexaferrite; Structural properties; Magnetic properties; Electrochemical sensor