The growth of few layer graphene (FLG) in powder form by CVD is particularly promising for its large scale production and use in composites as well as electrochemical and energy applications. The electronic and mechanical properties of FLG depends critically on the number of layers and the interlayer interaction. We have recently developed a fluidized bed chemical vapor deposition (FBCVD) process to produce FLG. We present results on the characterization of FLG flakes with FLG thickness varying from 3-8 nm prepared FBCVD. While transmission electron microscopy shows the formation of few layer graphene, Raman spectra bear the characteristics of single layer graphene with a relative low defect density indicating that the interaction between layers is reduced in FLG powders. The crystallographic ordering in FLGs is studied by combining Raman spectroscopy with Wide Angle X ray Scattering (WAXS). Heat treatment at 2800°C is employed to reduce the number of defects and to study the effect to temperature on the stacking order. The effect of nitrogen doping on the interlayer interaction in FLG has also been investigated.
Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2014: Graphene, CNTs, Particles, Films & Composites
Published: June 15, 2014
Pages: 68 - 71
Industry sector: Advanced Materials & Manufacturing
Topicss: Carbon Nano Structures & Devices, Graphene & 2D-Materials