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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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【答案】應(yīng)助回帖
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真強(qiáng)必勝: 金幣+3, goog 2014-01-13 21:38:44
lofed: 金幣+20, 翻譯EPI+1, ★★★★★最佳答案 2014-01-18 13:35:47
真強(qiáng)必勝: 金幣+3, goog 2014-01-13 21:38:44
lofed: 金幣+20, 翻譯EPI+1, ★★★★★最佳答案 2014-01-18 13:35:47
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大量片層研究發(fā)現(xiàn)石墨片不支持的氧化鋅顆粒比ZnO-GN0.1-200多。ZnO-GN0.3-200試樣的場(chǎng)發(fā)射掃描電子顯微鏡圖片顯示大量紡錘狀的納米結(jié)構(gòu)（圖2c）和相當(dāng)?shù)氖�。錠子大小[端-端距離（長度）]400-700nm。主軸表面不太光滑，似乎由球形納米晶組成。氧化鋅GN0.5-200薄膜（圖2d）襯墊層堆疊于分層結(jié)構(gòu)-----200-400納米大小的氧化鋅單分散聚集體，這種單分散聚集體由微小氧化鋅納米晶粒隨機(jī)集聚而成。不能清楚觀察到石墨烯片，表明實(shí)驗(yàn)過程中GO分散不好。圖2e示出了在ZnO-GN0.8-200的掃描電鏡圖像。大量的ZnO晶粒和相當(dāng)層狀復(fù)合物清晰可見。所有這些表明，由于石墨表面電荷互易增加，支撐ZnO的石墨減少。 圖2 （f, g, h）示出ZnO - GN0.1 -200的典型透射電子顯微鏡（TEM ）圖像。TEM圖像可見大量被氧化鋅顆粒覆蓋的石墨烯片。結(jié)果與掃描電鏡圖像相符。然而， 每個(gè)石墨納米片的ZnO數(shù)量是不同的。最不支持的情況下，我們可以明顯地觀察到石墨烯的性質(zhì)和部分石墨支持的氧化鋅粒子（圖2f） 。在適中的情況下，石墨烯片和氧化鋅粒子均勻地包圍。而且，圖2h觀察到相當(dāng)?shù)闹锌捉Y(jié)構(gòu)。從復(fù)合材料中的選擇性區(qū)域電子衍射（SAED ）圖案（圖2g 插入）揭示了ZnO的明顯單晶特征。該復(fù)合材料的電子衍射圖案也符合纖鋅礦型的ZnO結(jié)構(gòu)。電子衍射圖案不僅可以清楚地觀察到晶格間距的密度，還可以識(shí)別（120）衍射， （002） ，（101）和（210）衍射。（SAED ）圖案顯示復(fù)合物中的石墨烯具有好的晶型結(jié)構(gòu)。 |
2樓2014-01-12 12:34:03
3樓2014-01-12 13:50:26
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