**3. Conclusion and future remarks**

The screening of the electronic and vibrational structure of carbon allotropes through Raman spectroscopy has been decisive in determination of their structure and in the study of the interactions between the carbon allotropes with a myriad of other molecules. In fact, by selecting the appropriate laser line, it is possible to study in particular metallic or semiconducting tubes or monolayer graphenes. The new Raman instruments can give better Raman imaging of the samples and open the possibility to study inhomogeneity, chemical modifications, and many other aspects of the carbon samples in a large area.
