Aplicação do método ex situ na rápida modificação da superfície das nanoestruturas da magnetita empregando nanoestruturas de Ag, Au e Pd

Abstract

In the literature several methods for modifying Fe3O4-NPs are employed and they involve numerous surface modification steps, which demands longer synthesis time and high cost. Different than reported in literature, this work quickly and simply obtained hybrid nanostructures based on NPs-Fe3O4, where these were modified with metallic nanostructures of Ag, Au and Pd. These three metallic NPs were obtained by means of the adapted brust method, and anchored by the ex situmethod. The step was based on two phases, with the first committed to the development of NPs-Fe3O4-Ag. For this the NPs-Fe3O4 synthesized by the hydrothermal coprecipitation method, and average diameter of 14.25 were placed in the same environment as silver NPs (NPs-Ag) with a diameter of 3.9, under an ultrasonic bath. The second phase was engaged in the development of NPs-Fe3O4-Ag-Au-Pd. For this, the NPs-Fe3O4 were placed in the same environment as the NPs M, and taken, like the first phase, to an ultrasonic bath. Several techniques were used to identify the physical-chemical properties of these materials such as: ultraviolet and visible spectroscopy (UV-Vis), X-ray diffraction, transmission electron microscopy (TEM) and X-ray fluorescence (XRF).