**2.1. Configuration of C60 and C70 inside carbon nanotubes**

A C60 (C70) carbon peapod is considered to be consisting of a number of C60 (C70) molecules inside SWCNT. The configurations of C60 and C70 molecules within nanotube are diameter dependent. Carbon peapods can be produced in a very high yield close to 90% simultaneously by heating opened SWCNTs and fullerenes in a scaled quartz tube [6] and by the vapor phase reaction by using open end SWCNTs [7, 8]. The encapsulated molecules peas and the SWCNT pod are bonded through van der Waals interactions [6].
