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利用溶液中剪切剥离技术批量化生产无缺陷的石墨烯

To progress from the laboratory to commercial applications, it will be necessary to develop industrially scalable methods to produce large quantities of defect-free graphene. Here we show that high-shear mixing of graphite in suitable stabilizing liquids results in large-scale exfoliation to give dispersions of graphene nanosheets. X-ray photoelectron spectroscopy and Raman spectroscopy show the exfoliated flakes to be unoxidized and free of basal-plane defects. We have developed a simple model that shows exfoliation to occur once the local shear rate exceeds 10-4 s-1. By fully characterizing the scaling behavior of the graphene production rate, we show that exfoliation can be achieved in liquid volumes from hundreds of millilitres up to hundreds of litres and beyond. The graphene produced by this method performs well in applications from composites to conductive coatings. This method can be applied to exfoliate BN, MoS2 and a range of other layered crystals.



Nature Materials (2014) doi:10.1038/nmat3944  ASAP online
http://www.nature.com/nmat/journal/vaop/ncurrent/full/nmat3944.html

 

发布日期:2014/05/04 发布者: 点击数: