Fig. 5. Spherical-aberration corrected field emission TEM images of GO–Ir complex. (a) A low-magnification TEM image, (b) the selected area electron diffraction (SAED) pattern of the surface without iridium atom, (c) the SAED pattern of the surface with iridium atom, (d) high-resolution TEM image, (e) an enlarged fragment taken from (d) (shown by the square symbol), (f) an ultra-high resolution TEM image.