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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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RXMCDM
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5楼2014-01-12 14:33:50
RXMCDM
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真强必胜: 金币+3, goog 2014-01-13 21:38:44
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大量片层研究发现石墨片不支持的氧化锌颗粒比ZnO-GN0.1-200多。ZnO-GN0.3-200试样的场发射扫描电子显微镜图片显示大量纺锤状的纳米结构（图2c）和相当的石墨片。锭子大小[端-端距离（长度）]400-700nm。主轴表面不太光滑，似乎由球形纳米晶组成。氧化锌GN0.5-200薄膜（图2d）衬垫层堆叠于分层结构-----200-400纳米大小的氧化锌单分散聚集体，这种单分散聚集体由微小氧化锌纳米晶粒随机集聚而成。不能清楚观察到石墨烯片，表明实验过程中GO分散不好。图2e示出了在ZnO-GN0.8-200的扫描电镜图像。大量的ZnO晶粒和相当层状复合物清晰可见。所有这些表明，由于石墨表面电荷互易增加，支撑ZnO的石墨减少。 图2 （f, g, h）示出ZnO - GN0.1 -200的典型透射电子显微镜（TEM ）图像。TEM图像可见大量被氧化锌颗粒覆盖的石墨烯片。结果与扫描电镜图像相符。然而， 每个石墨纳米片的ZnO数量是不同的。最不支持的情况下，我们可以明显地观察到石墨烯的性质和部分石墨支持的氧化锌粒子（图2f） 。在适中的情况下，石墨烯片和氧化锌粒子均匀地包围。而且，图2h观察到相当的中孔结构。从复合材料中的选择性区域电子衍射（SAED ）图案（图2g 插入）揭示了ZnO的明显单晶特征。该复合材料的电子衍射图案也符合纤锌矿型的ZnO结构。电子衍射图案不仅可以清楚地观察到晶格间距的密度，还可以识别（120）衍射， （002） ，（101）和（210）衍射。（SAED ）图案显示复合物中的石墨烯具有好的晶型结构。 |
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3楼2014-01-12 13:50:26
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4楼2014-01-12 14:16:32