I am getting additional peaks with metal oxide nano particles of very small size.
Nano particles can produce additional Raman peaks compared to bulk. For the csae of CNT and graphene, it is a common site and their are associated with nano-crystaline defects or other possible modes (like radial breathing modes of CNTs) which can not be seen in bulk structures as they are smeared out.
You can look in this aspect. It will be beneficial if you mention what nanoparticle are you working with.
Another reason is than edge effects appear to be more intense on nanoparticles than on larger particles. Edge aliphatic bonds and also confinement effects can then be considered. However, in larger particles statistical atomic second order disorder is broadening Raman peaks and which will be overlapping and therefore, cannot always be well distinguished from each others. Micro-Raman can help to sort out edge and bulk effect.
what material? if noble metal, it is only surface-enhanced Raman scattering. Second option is that you are still in the molecular or cluster regime, then these clusters will have their own Raman signal.
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