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Graphene oxide (GO) sheets with desired sizes and narrow size distribution were synthesized via a modified Hummers method by using sieved graphite flakes as the starting materials. This method outweighs previous post-synthesis fractionation methods in efficiency and scalability; thus it is more promising for large-scale synthesis of size-controlled GO. The as-prepared GO suspensions exhibited size-dependent...
Carbon fiber reinforced polymers (CFRP) have been increasingly used in aircraft structures. However, their relatively low electrical conductivity leads to the vulnerability to lightning strike. Herein, the carbon nanotube buckypaper-based coatings composed of conductive buckypaper and insulating adhesives were developed to protect the CFRP laminates. Their influence on the lightning strike protection...
Graphite flakes with sizes in the range of 3–20μm can be completely converted into single-layer graphene oxide (GO) with a high yield of 171±4% via an improved Hummers method. This yield is much higher than that (110±3%) from larger graphite flakes with sizes of 10–100μm. The structures, qualities and size distributions of the GO sheets prepared from both graphite precursors are nearly identical....
An improved Hummers method without using NaNO 3 can produce graphene oxide nearly the same to that prepared by conventional Hummers method. This modification does not decrease the yield of product, eliminating the evolution of NO 2 /N 2 O 4 toxic gasses and simplifying the disposal of waste water because of the inexistence of Na + and NO 3− ions...
Direct graphene growth was demonstrated on exfoliated hexagonal boron nitride (h-BN) single crystal flakes by low pressure CVD. The size of the hexagonal single crystal graphene domain increases with deposition time, with maximum size of ∼270nm. Most domains were found to nucleate at screw dislocation sites, and a step-flow growth mechanism was observed at atomic steps on the h-BN surface. Understanding...
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