Graphene Oxide-Assisted Dispersion of Pristine Multiwalled Carbon Nanotubes in Aqueous Media
Graphene Oxide-Assisted Dispersion of Pristine Multiwalled Carbon Nanotubes in Aqueous Media
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DOI：
10.1021/jp103745g
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发表时间：
2010-06
影响因子：
3.7
通讯作者：
Chao Zhang;Lulu Ren;Xiao-yan Wang;Tianxi Liu
中科院分区：
文献类型：
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作者：
Chao Zhang;Lulu Ren;Xiao-yan Wang;Tianxi Liu
氧化石墨烯（GO）片是一种含有多个芳香区和亲水性氧基团的“软”二维大分子，它可以通过π-堆积作用吸附多壁碳纳米管（MWNTs），从而使MWNTs在水介质中稳定分散和断裂。通过改变MWNTs与GO片层的初始比例，可以得到水溶性和不溶性的复合物，这对于非共价方法增溶CNTs具有重要意义，为GO在胶体化学中的应用开辟了一条新的途径。溶解度结果表明，GO片易于稳定具有较大直径的MWNT。当碳纳米管的直径减小到一个临界值时，碳纳米管之间的π堆积相互作用被大的表面能削弱;碳纳米管倾向于形成束或扭曲结构，而不是CNT−GO复合物。该方法有望发展成为一种实用的在不同条件下制备不同外径MWNTs的方法。
Graphene oxide (GO) sheets, considered as “soft” two-dimensional macromolecules containing multiple aromatic regions and hydrophilic oxygen groups, can adsorb the pristine multiwalled carbon nanotubes (MWNTs) through the π-stacking interaction, thus causing pristine MWNTs to stably disperse and fractionate in aqueous media. The water-soluble and insoluble complexes can be obtained by changing the initial proportion of MWNTs to GO sheets, which are important for noncovalent approaches toward solubilizing CNTs and open a new way for GO applications in colloidal chemistry. Solubility results indicate that the GO sheets are prone to stabilize MWNTs with larger diameters. When the diameters of CNTs decrease to a critical value, the π-stacking interactions are weakened by large surface energy among CNTs themselves; the CNTs are inclined to form bundles or twisted structures instead of CNT−GO complexes. This can be probably developed into a practical method to fractionate MWNTs with different outer diameters in ...