Green Synthesis of Perovskite-Type LaMnO_۳ Nanoparticle: Morphological and Zeta-Potential Characterization

Perovskite-type LaMnO₃(LMO) was synthesized in this study via a green synthesis method using aloe vera extract as a natural complexing agent. The synthesis process was based on the interaction of metal nitrates with the organic components of aloe vera, followed by drying and high-temperature annealing. The phase composition and crystal structure of the obtained sample were determined using X-ray phase analysis (XRD). According to the analysis results, the sample corresponds to a single-phase orthorhombic LMO perovskite (Pnma), with lattice parameters: a = ۵.۵۳ Å, b = ۷.۸۱ Å, c = ۵.۵۲ Å, unit cell volume V = ۲۳۸.۱۳ ų, and X-ray density of ۶.۷۵ g/cm³. Using Fourier-transform infrared spectroscopy (FTIR), the main metal-oxygen bonds and characteristics of functional groups were evaluated. FTIR spectroscopy revealed Mn-O vibrations in the ۶۱۴ cm-۱ region and Mn-O-Mn vibrations in the ۷۱۰ cm-۱ region, confirming the presence of an octahedral structure. The microstructure and elemental composition of the sample were analyzed using a scanning electron microscope (SEM). SEM analysis showed that the particles have a submicron morphology ranging from ۰.۲ to ۰.۸ μm, with an average size of ۰.۴ μm. Energy-dispersive X-ray spectroscopy (EDS) showed that the elements La, Mn, and O are uniformly distributed in the sample, and the La:Mn atomic ratio is approximately ۱:۱. Additionally, zeta potential measurements showed that the LMO particles have an average zeta potential of +۲۴.۳۶ mV, confirming that the surface is positively charged and that the suspension is colloidally stable.

کلیدواژه ها:

Green synthesis ، LaMnO۳ ، perovskite manganite ، Zeta potential ، morphology