Abstract
Reduced graphene oxide–magnetite hybrid aerogels attract great interest thanks to their potential applications, e.g., as magnetic actuators. However, the tendency of magnetite particles to migrate within the matrix and, ultimately, escape from the aerogel structure, remains a technological challenge. In this article we show that coating magnetite particles with polydopamine anchors them on graphene oxide defects, immobilizing the particles in the matrix and, at the same time, improving the aerogel structure. Polydopamine coating does not affect the magnetic properties of magnetite particles, making the fabricated materials promising for industrial applications.
Highlights
Preparation of hybrid aerogels based on two-dimensional carbon nanomaterials with unique physicochemical properties is among the most popular recent nanotechnological trends [1]
The reduced graphene oxide (rGO), rGO-Fe3O4 and rGO-PDA@Fe3O4 aerogels were synthesized as described in the Experimental section
An exception were measurements performed with EL = 1.96 eV, whereas FWHM of both D and G modes of magnetic nanoparticles (MNPs)-modified aerogel samples did not increase more than 2.5 cm−1 with respect to the rGO reference value
Summary
Preparation of hybrid aerogels based on two-dimensional carbon nanomaterials with unique physicochemical properties is among the most popular recent nanotechnological trends [1]. The second effect, i.e., the decreased ID/IG ratio of modified aerogel samples as compared to the ratio obtained for the reference rGO aerogel, is related to the stabilization of rGO aerogel structure by Fe3O4 nanoparticles that anchor at the GO defect sites via monodente or bidentate coordination of iron with carboxylic groups during hydrogel formation [49].
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