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

  • Valéria S. Marangoni
  • Marccus Victor A. Martins
  • José A. Souza
  • Osvaldo N. OliveiraJr.
  • Valtencir Zucolotto
  • Frank N. Crespilho
Research Paper

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.

Keywords

Magnetic nanoparticles Layer-by-layer assembly 

Notes

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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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Valéria S. Marangoni
    • 1
  • Marccus Victor A. Martins
    • 3
  • José A. Souza
    • 3
  • Osvaldo N. OliveiraJr.
    • 1
  • Valtencir Zucolotto
    • 1
  • Frank N. Crespilho
    • 2
    • 3
  1. 1.Instituto de Física de São CarlosUniversidade de São PauloSão CarlosBrazil
  2. 2.Instituto de Química de São Carlos, CP 780, Universidade de São PauloSão CarlosBrazil
  3. 3.Centro de Ciências Naturais e HumanasUniversidade Federal do ABCSanto AndréBrazil

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