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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Marangoni, Valeria S. [1] ; Martins, Marccus Victor A. [2] ; Souza, Jose A. [2] ; Oliveira, Jr., Osvaldo N. [1] ; Zucolotto, Valtencir [1] ; Crespilho, Frank N. [3, 2]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210170 Santo Andre - Brazil
[3] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF NANOPARTICLE RESEARCH; v. 14, n. 4 APR 2012.
Web of Science Citations: 8
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. (AU)

FAPESP's process: 09/15558-1 - Biomolecules and cellular system interaction with nanostructures 0D, 1D and 2D by using electrochemical methods
Grantee:Frank Nelson Crespilho
Support Opportunities: Regular Research Grants
FAPESP's process: 09/18618-5 - Synthesis and characterization of thermodynamic and electrical transport properties of advanced materials
Grantee:José Antonio Souza
Support Opportunities: Regular Research Grants
FAPESP's process: 11/01541-0 - Development of bioanodes composed by glucose oxidase and fructose dehydrogenase and its recombinant structures for aplication in prototype of biofuel cell: power generation from biomass (sugar cane)
Grantee:Frank Nelson Crespilho
Support Opportunities: Regular Research Grants