An extinction of the conductive electrons of fullerene nano whisker as the air exposure effects

Abstract

ESR spectra of fullerene nano-whiskers (FNW) are investigated to elucidate their electronic properties and the influence of oxygen absorption. A singlet ESR spectrum appears together with temperature independent Pauli-para type behavior in the area intensity (which indicates the magnetic susceptibility ( ESR )) in vacuum. Motional narrowing of the absorption width is observed in vacuum due to fast molecule motion. Absorption of oxygen eliminates Pauli-para behavior and motional narrowing. Furthermore, creation of localized spins is observed and  ESR shows no Pauli-para contribution after absorption. A kind of metal insulator transition due to gas absorption is therefore observed by ESR in the system of C 60 FNW.