Nano Archive

Electrochemical synthesis of magnetic iron oxide nanoparticles with controlled size

Starowicz, Maria and Starowicz, Paweł‚ and Żukrowski, Jan and Przewoźnik, Janusz and Lemański, Andrzej and Kapusta, Czesław and Banaś, Jacek (2011) Electrochemical synthesis of magnetic iron oxide nanoparticles with controlled size. Journal of Nanoparticle Research, 13 (12). pp. 7167-7176.

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We present a novel and facile method enabling synthesis of iron oxide nanoparticles, which are composed mainly of maghemite according to X-ray diffraction (XRD) and Mössbauer spectroscopy studies. The proposed process is realized by anodic iron polarization in deaerated LiCl solutions containing both water and ethanol. Water seems to play an important role in the synthesis. Morphology of the product was studied by means of transmission electron microscopy and XRD. In the solution containing almost 100% of water a black suspension of round shaped maghemite nanoparticles of 20–40 nm size is obtained. Regulating water concentration allows to control nanoparticle size, which is reduced to 4–6 nm for 5% of water with a possibility to reach intermediate sizes. For 3% or lower water concentration nanoparticles are of a needle-like shape and form a reddish suspension. In this case phase determination is problematic due to a small particle size with the thickness of roughly 3 nm. However, XRD studies indicate the presence of ferrihydrite. Coercivities of the materials are similar to those reported for nanoparticle magnetite powders, whereas the saturation magnetization values are considerably smaller.

Item Type:Article
ID Code:11406
Deposited By:Prof. Alexey Ivanov
Deposited On:05 Jan 2012 09:26
Last Modified:05 Jan 2012 09:42

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