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The processing of polyelectrolyte-covered magnetite nanoparticles in the form of nanostructured thin films

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Abstract

Magnetic nanoparticles are promising for a variety of applications, such as biomedical devices, spin electronics, magnetic data storage media, to name a few. However, these goals may only be reached if stable and organized structures are fabricated. In this article, we report on a single-step synthetic route with the coprecipitation method, in which iron oxide magnetic nanoparticles (Fe3O4 NPs) were stabilized in aqueous media using the poly(diallyldimethylammonium chloride) (PDAC) polyelectrolyte. The Fe3O4 NPs had a diameter of ca. 5 nm, according to transmission electron microscopy (TEM) images, being arranged in an inverse spinel structure typical of magnetite. An investigation with infrared spectroscopy indicated that the mechanisms of stabilization in the polymer matrix were based on the interaction between quaternary amide groups from PDAC and the nanoparticle surface. The Fe3O4-PDAC NPs exhibited considerable magnetic susceptibility, with a monotonic increase in the magnetization with decreasing temperature. These Fe3O4-PDAC NPs were immobilized in layer-by-layer (LbL) films, being alternated with layers of poly(vinylsulfonic acid) (PVS). The LbL films were much rougher than typical films made with polyelectrolytes, and Fe3O4-PDAC NPs have been responsible for the high electrocatalytic activity toward H2O2 reduction, with an overpotential shift of 0.69 V. Overall, the stability, magnetic properties and film-forming ability indicate that the Fe3O4-PDAC NPs may be used for nanoelectronics and bioelectrochemical devices requiring reversible and magnetic redox materials.

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Acknowledgment

The financial support from FAPESP (Projects numbers: 2009/18618-5, 2009/15558-1 and 2011/01541-0), CAPES, CNPq (Projects numbers: 307436/2008-0 and 304255/2010-6), INEO, and Rede NanoBioMed-Brasil (CAPES) is acknowledged.

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Authors and Affiliations

  1. Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, 13560-970, Brazil

    Valéria S. Marangoni, Osvaldo N. Oliveira Jr. & Valtencir Zucolotto

  2. Instituto de Química de São Carlos, CP 780, Universidade de São Paulo, São Carlos, 13560-970, Brazil

    Frank N. Crespilho

  3. Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, 09210-170, Brazil

    Marccus Victor A. Martins, José A. Souza & Frank N. Crespilho

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  1. Valéria S. Marangoni
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  2. Marccus Victor A. Martins
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  3. José A. Souza
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  4. Osvaldo N. Oliveira Jr.
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  5. Valtencir Zucolotto
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  6. Frank N. Crespilho
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Correspondence to Frank N. Crespilho.

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Marangoni, V.S., Martins, M.V.A., Souza, J.A. et al. The processing of polyelectrolyte-covered magnetite nanoparticles in the form of nanostructured thin films. J Nanopart Res 14, 769 (2012). https://doi.org/10.1007/s11051-012-0769-9

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