Exfoliation of Graphite Oxide in Water without Sonication: Bridging Length Scales from Nanosheets to Macroscopic Materials
Exfoliation of Graphite Oxide in Water without Sonication: Bridging Length Scales from Nanosheets to Macroscopic Materials
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DOI：
10.1021/cm501305c
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发表时间：
2014-05
影响因子：
8.6
通讯作者：
I. Ogino;Y. Yokoyama;Shinichiroh Iwamura;S. Mukai
中科院分区：
文献类型：
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作者：
I. Ogino;Y. Yokoyama;Shinichiroh Iwamura;S. Mukai
在重复的简单冻融循环促进下，通过无声波剥离的新方法合成了水中分散的氧化石墨烯（GO）纳米片。这些循环包括含有氧化石墨的水溶液的快速冻结和随后产生的固体的融化。这种方法对于氧化石墨的剥离是有效的，经过六次重复的冻融循环后，氧化石墨烯的产量约为80%。原子力显微镜和动态光散射结果表明，该方法制备的氧化石墨烯在剥离过程中破碎程度最小，横向尺寸比超声制备的氧化石墨烯大3倍以上。我们还演示了使用这种方法合成的去角质氧化石墨烯作为合成低密度（≈0.02 g cm-3）大孔单片材料的构建块，使用定向冷冻，在溶液中形成冰棒，作为模板来指导…
Dispersed graphene oxide (GO) nanosheets in water were synthesized via a new approach involving sonication-free exfoliation, as promoted by repetitive simple freeze–thaw cycles. These cycles consist of rapid freezing of an aqueous solution containing graphite oxide and subsequent thawing of the resultant solid. This approach is effective for exfoliation of graphite oxide and yields approximately 80% GO after six repetitive freeze–thaw cycles. The GO synthesized by the new method experiences minimal fragmentation during the exfoliation process and has a lateral size at least 3-fold larger than that of GO prepared by using sonication, as evidenced by atomic force microscopy and dynamic light scattering. We also demonstrate use of the resulting exfoliated GO that is synthesized using this approach as a building block for the synthesis of a low-density (≈0.02 g cm–3) macroporous monolithic material, using directional freezing, which forms ice rods within the solution that served as the template to direct the ...