Facile preparation of pristine graphene using urea/glycerol as efficient stripping agents
urea/glycerol, pristine graphene, thermal conductivity, graphene-based composite
ABSTRACT Large-scale exfoliation of defect-free and few-layer graphene by an inexpensive and environmentally-friendly route has been a significant challenge for a long time. Here we show that high-quality, few-layer graphene with high stability and low defect content can be obtained from natural graphite via a simple stirring process in urea/glycerol, with yields of up to 12 wt.%. We also demonstrate that this facile method can be applied to the exfoliation of other two-dimensional materials, such as molybdenum disulfide and boron nitride. The as-prepared graphene was further composited with polyvinylidene fluoride (PVDF) and the composite exhibited a low percolation threshold of 0.05 vol.%. The incorporation of low (4.5 vol.%) graphene amounts led to a significant increase in the thermal conductivity of the graphene–PVDF composites.
Tsinghua University Press
Jianping Chen,Weili Shi,Zhaodongfang Gao,Tao Wang,Shan Wang,Lijie Dong,Quanling Yang,Chuanxi Xiong, Facile preparation of pristine graphene using urea/glycerol as efficient stripping agents. NanoRes.2018, 11(2): 820–830