Abstract
Acridine as well as anthracene were pyrolyzed at 550°C under high pressure. Both resulting carbons were subsequently heat treated together to various temperatures ranging from 600 to 2500°C. The effect of nitrogen doping was studied by comparing various properties of the two kinds of carbons. Chemical analysis showed that the nitrogen content of acridine carbons decreases steadily as the heat treatment temperature increases from 600 to 1700°C. No significant amount of nitrogen was detected in the samples treated above 1800°C. Paramagnetism and diamagnetism are nearly identical for anthracene and acridine carbons when HTT exceeds 1800°C. Determinations of the Hall coefficient yield also similar results for both kinds of carbons. For HTT below 1800°C the effect of nitrogen seems to consist mainly of a negative catalysis of the graphitization process. An analysis of the (paramagnetic and diamagnetic) experimental data shows that the number of lattice defects and free charge carriers is much higher for acridine carbons than for anthracene carbons: the effect of nitrogen doping appears to be in lowering of the Fermi level. There seems to be very little, if any, substitution of nitrogen atoms into the graphitic lattice.
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