The Influence Factors on δ-FeOOH Nanosheets Preparation

δ-FeOOH nanosheets have been synthesized on a large-scale by a simple method using NH 3 ·H 2 O as precipitant at pH 10. The samples were characterized by FESEM, XRD, TEM, FTIR and PPMS. The results of this characterization reveal that the complexes [Fe III (OH) n (NH 3 ) m ] 3− n formed between Fe 3+ ions and NH 3 favor nucleation and oriented growth of δ-FeOOH nanosheets. The influences of precipitant, the initial pH, and concentration of H 2 O 2 on the structure and morphology of the as-prepared δ-FeOOH have been investigated. Magnetic investigations show that the δ-FeOOH nanosheets exhibit high coercivity.