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　　A large amount of sheets are observed. The ZnO particles which are not supported on graphene sheets are much more than that of ZnO-GN0.1-200. FESEM image of sample ZnO-GN0.3-200 shows a large number of spindle-shaped nanostructures (Figure 2c) as well as some graphene sheets. The size [end-to-end distance (length)] of the spindles are in the ranges of 400-700nm. The surfaces of the spindles are not very smooth and are seemingly composed of spherical nanocrystallites. The underlayer of ZnO-GN0.5-200 film (Figure 2d) is well stacked with hierarchically structured 200-400 nm-sized ZnO monodisperse aggregates, which was constructed by the random agglomeration of tiny sized ZnO nanocrystalline particles. The graphene sheets are not clearly observed, indicating that the GO is not well dispersed in the experimental process. Figure 2e shows the SEM image of the ZnO-GN0.8-200. A large amount of ZnO grains and some layered composite are clearly observed. All these results suggest that the quantity of supported ZnO is decreased with the increasing of graphene due to the reciprocity of surface charges.
　　Figure 2(f, g, h) presents the typical transmission electron microscopy (TEM) image of ZnO-GN0.1-200. The TEM images show that a large number of graphene sheets are covered by ZnO particles. The result is coinsided with SEM. However, the quantity of ZnO on each graphene nanosheet is different. In the least supported case, we can obviously observe the character of graphene and some supported ZnO particles (Figure 2f). In the moderate case, the graphene sheets are homogeneously surrounded with ZnO particle. Moreover, some misopore structures are observed from Figure 2h. The selected area electron diffraction (SAED) pattern (Figure 2g insert) from the composite discloses that the ZnO is an obvious single crystalline character. The SAED pattern of the composite also corresponded to the wurtzite ZnO structures. Not noly the intensity of the lattice spacings could be clearly observed in the SAED pattern, but also the diffractions of (120), (002), (101) and (210) could be identified. The form of graphene in the composite having good crystalline character as shown by the SAED pattern.

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