Fig. 2: The preparation and characterization of Fe3O4@G nanoparticles.
From: A reconfigurable and magnetically responsive assembly for dynamic solar steam generation
a Schematic diagram for the facile two-step synthesis of Fe3O4@G. b, c Transmission electron microscopy (TEM) images of Fe3O4@G nanoparticle at different magnification. d Scanning electron microscopy (SEM) images of evenly distributed Fe3O4@G nanoparticles at low magnification. Inset image is the high-resolution SEM image showing the uniform wrapping of graphene sheets on Fe3O4@G nanoparticle. Scale bar, 100 nm. e Zeta potential of graphene oxide (GO), Fe3O4, graphene oxide wrapped Fe3O4 (Fe3O4@GO), and Fe3O4@G. f Raman spectra of Fe3O4, Fe3O4@GO, and Fe3O4@G. g XRD spectra of Fe3O4, Fe3O4@GO, and Fe3O4@G. h TGA curves of Fe3O4, Fe3O4@GO, and Fe3O4@G. The red region, green region, and blue region refer to the periods of reduction of GO, oxidation of Fe3O4, and excessive oxidation of graphene, respectively. i Magnetic hysteresis loops of Fe3O4, Fe3O4@GO, and Fe3O4@G. Inset is the magnified figure of the hysteresis loops. j Ultraviolet-Visible-Near infrared spectra of Fe3O4, Fe3O4@GO, Fe3O4@G, and sunlight. Inset image is the enlarged figure at visible and infrared band. Source data are provided as a Source Data file.
