GREEN SYNTHESIS OF BISMUTH FERRITE NANOPARTICLES FOR ENHANCED HUMIDITY STABILITY IN PVA-PANI POLYMER MEMBRANE
Authors: Ananya Singh Chauhan, Priyanka Verma
Published: March 2024
Abstract
<p>Ferroic materials, renowned for their switchable internal ordering, are instrumental in diverse applications within functional physics and material science. Bismuth ferrite (BFO), a multiferroic substance, exhibits both ferromagnetic and ferroelectric properties, allowing for a unique magneto-electric coupling where electric polarization and magnetic fields can reciprocally influence each other. Existing in various forms, including single crystals, poly-crystals, and diverse nanostructures, BFO's rhombohedral perovskite-type structure, belonging to the R3c space group, underscores its versatility. Despite lower insulation resistance attributed to the creation of oxygen vacancies during the reduction of Fe3+ into Fe2+, BFO remains favorable for gas sensing applications due to its small band gap, thermal stability, and consistent nature over time. Synthesizing BFO nanoparticles typically involves various techniques like hydrothermal, mechanochemical, co-precipitation, sol-gel, and solution combustion methods. Achieving sustainable and stable nanoparticle synthesis requires the use of environmentally friendly, renewable reducing or capping agents, coupled with easily accessible facilities for nanoparticle redemption after the synthesis process. In this context, the environmentally compatible green synthesis route has gained prominence, particularly for creating noble nanostructural materials using biological compounds as reducing or capping agents. The present study exemplifies this trend by utilizing Moringa oleifera L. leaf extract for the green synthesis of BFO nanoparticles. Moringa oleifera L., a medicinal plant referenced in the first century A.D. in Sushruta Samhita, provides historical evidence of its existence and beneficial utilization in India thousands of years ago.</p>
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