Raman spectroscopy of carbon materials and their composites: Graphene, nanotubes and fibres Raman spectroscopy is now an extremely important technique for the analysis of carbon-based materials. It is demonstrated how it can be used to give a unique insight into characterising many aspects of the microstructure of these materials, including orientation, number of layers, defects and doping, enabling standardisation and quality control. Graphene, as the building block of all sp2 carbon materials...