Solvothermal Synthesis and Characterization of Fe₃O₄ and γ-Fe₂O₃ Nanoplates

Abstract

γ-Fe₂O₃ nanoplates were prepared by a simple solution process and could be transformed to Fe₃O₄ nanoplates while keeping the size and morphology unchanged after reduction in hydrazine solution. The crystal structure and surface organic groups of the nanoplates were characterized in detail. The nanoplates exhibited good dispersibility in polar solvents except water and strong dipolar interactions, which favored the formation of one-dimensional chainlike structure. The poly(vinylpyrrolidone) molecules in this system played a key role for the growth of nanoplates, and it was supposed that the formation of nanoplates was a kinetically controlled process. The γ-Fe₂O₃ and Fe₃O₄ nanoplates with strong dipolar interactions are ferromagnetic at room temperature.