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

Content Provider	Springer Nature Link
Author	Marangoni, Valéria S. Martins, Marccus Victor A. Souza, José A. Oliveira, Osvaldo N. Zucolotto, Valtencir Crespilho, Frank N.
Copyright Year	2012
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 (Fe$_{3}$O$_{4}$ NPs) were stabilized in aqueous media using the poly(diallyldimethylammonium chloride) (PDAC) polyelectrolyte. The Fe$_{3}$O$_{4}$ 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 Fe$_{3}$O$_{4}$-PDAC NPs exhibited considerable magnetic susceptibility, with a monotonic increase in the magnetization with decreasing temperature. These Fe$_{3}$O$_{4}$-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 Fe$_{3}$O$_{4}$-PDAC NPs have been responsible for the high electrocatalytic activity toward H$_{2}$O$_{2}$ reduction, with an overpotential shift of 0.69 V. Overall, the stability, magnetic properties and film-forming ability indicate that the Fe$_{3}$O$_{4}$-PDAC NPs may be used for nanoelectronics and bioelectrochemical devices requiring reversible and magnetic redox materials.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	14
Issue Number	4
e-ISSN	1572896X
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-03-31
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Magnetic nanoparticles Layer-by-layer assembly Nanotechnology Inorganic Chemistry Physical Chemistry Characterization and Evaluation of Materials Optics, Optoelectronics, Plasmonics and Optical Devices
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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