Figure 4

TEM bright-field images of (a, b) rGO, (d, e) ZnO, (g–i) rGO_x@ZnO composites where x = 3, 5 and 7 wt% of rGO samples, respectively, (j)-(k) rGO₅@ZnO composite, and corresponding HRTEM images (c) rGO, (f) ZnO, (i) rGO_x@ZnO (l) rGO₅@ZnO composites samples, respectively.