Low temperature fullerene encapsulation in single wall carbon nanotubes: synthesis of N@C${}_{60}$@SWCNT

Abstract

High filling of single wall carbon nanotubes (SWCNT) with C${}_{60}$ and C${}_{70}$ fullerenes in solvent is reported at temperatures as low as 69 ${}^o$C. A 2 hour long refluxing in n-hexane of the mixture of the fullerene and SWCNT results in a high yield of C${}_{60}$,C${}_{70}$@SWCNT, fullerene peapod, material. The peapod filling is characterized by TEM, Raman and electron energy loss spectroscopy and X-ray scattering. We applied the method to synthesize the temperature sensitive (N@C${}_{60}$:C${}_{60}$)@SWCNT as proved by electron spin resonance spectroscopy. The solvent prepared peapod samples can be transformed to double walled nanotubes enabling a high yield and industrially scalable production of DWCNT.

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