Drummond AL, Feitoza NC, Duarte GC, Sales MJA, Silva LP, Chaker JA, Bakuzis AF, Sousa MH. Reducing size-dispersion in one-pot aqueous synthesis of maghemite nanoparticles.
J Nanosci Nanotechnol 2012;
12:8061-8066. [PMID:
23421179 DOI:
10.1166/jnn.2012.6614]
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Abstract
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.
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