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Reducing Size-Dispersion in One-Pot Aqueous Synthesis of Maghemite Nanoparticles

2012; American Scientific Publishers; Volume: 12; Issue: 10 Linguagem: Inglês

10.1166/jnn.2012.6614

1533-4899

Adriana Linhares Drummond, Natálie C. Feitoza, Gian Carlos Silva Duarte, Maria J. A. Sales, Luciano Paulino Silva, Juliano Alexandre Chaker, Andris F. Bakuzis, Marcelo Henrique Sousa,

Nanomaterials for catalytic reactions

Nanosized maghemite-like particles with reduced size-distribution were obtained using a one-pot synthesis route in aqueous medium. Forced hydrolysis of iron ions in ammoniac solution led to the formation of magnetite nanoparticles that were oxidized to maghemite in a hydrothermal digestion step that reduced the polydispersity of nanograins. The prepared nanoparticles were characterized by chemical analysis, X-ray diffractometry, magnetization, Raman spectroscopy and transmission electron microscopy measurements. Data showed that 14 nm-sized particles with polydispersity of about 0.14 were produced and, differently from other procedures, neither additional steps nor toxic reagents were needed to reduce size-dispersion or to oxidize magnetite to maghemite. These facts per se turn such nanodevice into a good potential choice for biomedical applications.