The Impact of pH Value on the Structural, Optical, and Magnetic Characteristics of Nickel Ferrite Nanoparticles Produced Hydrothermally for Use in Photodetectors
Keywords:
magnetic properties, nickel ferrite, hysteresis, hydrothermal, photodetector.Abstract
Abstract: This study investigates the synthesis of nickel ferrite nanoparticles (NiFe2O4) using the hydrothermal method at different pH values (5, 9, and 11). The synthesized nanoparticles were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX), UV-Vis spectroscopy, and a vibrating sample magnetometer (VSM). XRD analysis confirmed the crystalline nature of NiFe2O4 with a face-centered cubic (FCC) structure. FESEM images revealed the formation of spherical nanoparticles with sizes below 100 nm, while EDX analysis verified the presence of nickel and iron elements.
Magnetic characterization using VSM demonstrated the magnetic behavior of the synthesized nanoparticles through parameters such as saturation magnetism (Ms) and coercivity (Hc). The saturation magnetization increased with increasing pH, with values of 5, 9, and 11, respectively. UV-Vis spectroscopy exhibited a blue shift in the surface plasmon resonance (SPR) absorption peak with increasing pH. Optical analysis indicated that the optical band gap energy increased from 3.35 to 4.01 eV as the pH increased from 5 to 11, following a direct electronic transition.
Based on the structural, optical, and magnetic analyses, pH11 was identified as the optimal condition for synthesizing nickel ferrite nanoparticles and was subsequently employed in photodetector applications. The fabricated photodetector exhibited a high photosensitivity of 231.89% and demonstrated a rapid and significant photoresponse under illumination at 350 nm.
Keywords: Magnetic properties, Nickel ferrite, Hysteresis, Hydrothermal, Photodetector.
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