The XRD peaks of nanoparticles-reduced graphene oxide nanocomposites are broader than the XRD peaks of nanoparticles. Also, their intensity is lower than the nanoparticles.
Do you have XRD scans of your pure reduced graphene oxide without nanoparticles and can you compare this to pristine graphene? Depending on your method of reducing graphene oxide, you could be damaging the structure of the graphene platelets, essentially reducing their mean size as evident in the broader peaks of your XRD scan.
The FWHM of the diffraction peaks gives information about the size of the nanoparticles. It has been observed that in the presence of the graphene oxide it will lead to formation of smaller particles which could be reason for increase in the FWHM of the diffraction peaks. Decrease in the peak intensity reveals that the nanoparticles have poor crystallinity.
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