Two-temperature EPR measurements of multi-walled carbon nanotubes, Pawel/
Szroeder, Waldemar Marciniak, Franciszek Rozpl/och, Instytut Fizyki UMK, ul.
Grudziadzka 5/7, 87-100 Torun, Poland
Two-temperature EPR measurement is a method used for determination of
localised and conduction electron contribution in EPR signal. It is
applied for investigations of carbon materials containing sp2-phase.
The conduction mechanisms are well understood in single-walled
nanotubes. However for multi-walled nanotubes this problem is more
complex due to the interactions between adjacent cylindrical graphene
sheets. This situation is analogous to that of graphite.
There were measured samples obtained using both arc discharge and
hydrocarbon pyrolysis methods. The existence of conduction electrons
in EPR signal was confirmed but the contribution of them was lower
than in the pure graphite. These results are interpreted as the effect
of the nanotube graphene sheet curvature, which leads to increase of
charge localisation.

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