This study demonstrates enhanced photodetector performance in nanocomposites, suggesting that ZnO composition significantly influences optical and electrical properties.
This study aims to develop an active photodetector material based on a nano composite thin film of Mn₀.₇₅Fe₂.₂₅O₄/ZnO/PVP/PABS. This material has been successfully synthesized using a multi-method approach, including co-precipitation for Mn₀.₇₅Fe₂.₂₅O₄, sol-gel processing for ZnO, and dual-solution polymerization to produce PABS. X-ray diffraction revealed high crystallinity, with Mn₀.₇₅Fe₂.₂₅O₄ crystallite sizes of 5.25-8.21 nm and ZnO crystallite sizes of 11.19-17.60 nm, corroborated by transmission electron microscopy (11.00-17.33 nm). VSM tests uncovered superparamagnetic behavior, with saturation magnetization (Ms) values decreasing from 13.97 to 8.02 emu/g as ZnO content increased. UV–Vis spectroscopy indicated band gap energies of 3.15–3.57 eV, refractive indices of 1.87–2.13, optical conductivities of (8.50–9.68) × 10⁷ S/cm, and electrical conductivities of 25.91–29.52 S/cm. Photodetector performance testing demonstrated rise times of 0.11–1.11 s and decay times of 0.99–2.53 s, reflecting a fast and stable response under visible light illumination. The novelty of the study lies in the integration of four components, including Mn₀.₇₅Fe₂.₂₅O₄ nanoparticle, ZnO semiconductor, PVP matrix polymer, and conductive PABS polymer, into an inorganic-organic hybrid nano-composite thin film fabricated via spin coating. These findings offer a cost-effective and highly applicable alternative for photodetector materials in future optical sensor technologies.
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Wulandari et al. (2025) studied this question.
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