Abstract
The influence of nitrogen on the process of fullerene formation in the carbon arc discharge in a helium/nitrogen atmosphere has been studied. Applying optical emission spectroscopy and using the self-absorption effect, the spatial distribution of the temperatures and chemical species, i.e. C 2( a 3Π u , v″=0) and CN( X 2Σ +, v″=0) radicals produced by the d.c. arc discharge between pure graphite electrodes, were determined across the arc gap. The soot product was analyzed spectrophotometrically to determine C 60 content. C 60 was detected even when pure nitrogen was used (at about 0.5 wt%). The relative content of higher fullerenes was measured by mass spectrometry and their formation was found to be significantly enhanced in the presence of nitrogen.
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