Herein we report a new approach to fabricating nanoscrolls through the self-assembly of graphene oxide (GO) sheets in a dispersion. The assembly process for GO nanosheets was induced by the dropwise addition of an appropriate organic solvent such as N,N-dimethylformamide (DMF) into the aqueous dispersion. The results show that nanoscrolls were gradually formed from the GO sheets by rolling-up in a piece-by-piece manner with the increase of the DMF content. The transmission electron microscopic analysis indicates that for a typical case, the nanoscrolls have an average diameter of 242 ± 102 nm at the central part and the interlayer spacing between adjacent GO layers is 0.58 nm. The scrolls were estimated to have 207 turns and include on average 42 pieces of GO sheets per scroll. By this method, GO sheets with different sizes and oxidation degrees were proved to be able to form GO nanoscrolls in a similar way. Moreover, it is interesting that the diffraction efficiency of surface-relief-gratings photoinduced on the film of azo molecular glass was significantly enhanced by doping the GO nanoscrolls with a very low content (0.5 wt%); this suggests a possible new application for the GO scrolls in optical devices. This facile approach, which is also feasible by using other organic solvents such as ethanol, can be used to fabricate GO nanoscrolls for large scale applications in supercapacitors, sensors and other devices.

中文翻译：

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通过溶剂诱导的分散体自组装将氧化石墨烯片卷起†

本文中，我们报告了一种通过分散体中氧化石墨烯（GO）片材的自组装来制造纳米卷的新方法。通过滴加适当的有机溶剂（如N，N将-二甲基甲酰胺（DMF）放入水分散液中。结果表明，随着DMF含量的增加，GO片材通过逐段卷起逐渐形成纳米卷。透射电子显微镜分析表明，对于典型情况，纳米卷的中心部分的平均直径为242±102nm，并且相邻GO层之间的层间间隔为0.58nm。涡卷估计有207圈，平均每个涡卷包含42张GO纸。通过这种方法，具有不同尺寸和氧化度的GO片材被证明能够以类似的方式形成GO纳米卷。而且，有趣的是，通过掺入极低含量（0.5 wt％）的GO纳米卷，可以显着提高偶氮分子玻璃薄膜上光诱导的表面浮雕光栅的衍射效率。这表明光学设备中的GO涡旋可能有新的应用。这种简便的方法，也可以通过使用其他有机溶剂（例如乙醇）来实现，可用于制造GO纳米卷，用于大规模应用在超级电容器，传感器和其他设备中。