Figure 1
From: Restoration of thermally reduced graphene oxide by atomic-level selenium doping
Direct observation of selenium atoms doped on rGO. Topographical images of Se-rGO recorded using (a) atomic force microscopy and (b) FE-TEM. Se-rGO has a thickness of ~15 nm and a lateral size of several micrometers, exhibiting a high aspect ratio. Electron energy loss spectroscopy (EELS) mapping images of (c) carbon and (d) selenium. Selenium atoms were homogeneously doped over the whole surface of rGO. (e) Scanning transmission electron microscopy image of Se-rGO. Numerous bright spots are observed on the entire surface of Se-rGO. (f) High-resolution transmission electron microscopy (HR-TEM) image of Se-rGO, showing its highly amorphorized surface. (g) Higher magnification HR-TEM images obtained from f. The atoms observed as bright spots, having a larger size than other ones, are considered selenium atoms.
