Résumé
By combining resonant Raman spectroscopy and electron diffraction experiments on suspended (free-standing) individual carbon nanotubes, we have been able to determine unambiguously their in-air and room-temperature main features. In this communication we review the results obtained from these combined experiments on single-walled (SWNT) and double-walled (DWNT) carbon nanotubes. The dependence of the Raman features of these nanotubes as a function of their structure is discussed and compared with theoretical predictions.