Fig. 1

a Schematic of G₄@IONPs synthesis, b TEM image, and c size distribution of G₄@IONPs, d DLS shows hydrodynamic size of G₄@IONPs, e VSM illustrates the maximum magnetizations of IONPs and G₄@IONPs at room temperature, f XRD identifies the crystal structure and shows all diffraction peaks assigned to IONPs, and g FT-IR spectra of pure IONPs and G₄@IONPs