Interlayer interaction and disorder in few layer graphene powders prepared by fluidized bed chemical vapor deposition
Résumé
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 structural measurements on FLG flakes with 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. 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.
Mots clés
Chemical vapor deposition
Defect density
Defects
Deposition
Fluidization
Fluidized bed process
Nanotechnology
Powders
Transmission electron microscopy
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Fluidized bed chemical vapor deposition
Interlayer interactions
Keywords for indexing
Large scale productions
Low defect densities
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Structural measurements
Graphene
Nanocomposite films
Mechanical properties
Fluidized beds