Journal
CARBON
Volume 38, Issue 8, Pages 1199-1206Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0008-6223(99)00245-6
Keywords
carbon films, doped carbons; oxidation; thermal analysis (TGA); catalytic properties
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The oxidation behavior of polyimide-derived carbon films doped with boron in low levels (up to 1.23X10(-2) B/C) was investigated by means of thermogravimetric analysis (TGA). It was observed that boron-doping less than 7.09x10(-3) B/C in the carbon film formed at 1500 degrees C had a catalytic effect on the oxidation of the carbon. Based on a kinetic analysis, it is revealed that. four factors - the catalytic effect and the inhibiting effect of substitutional boron, the improvement of graphitization due to boron doping, and the formation of B2O3 during oxidation - may contribute to the appearance of the oxidation process. The catalytic effect would be dominant up to some level of carbon burn-off when less boron is doped; the contribution of the inhibiting effect(s) may rapidly become dominant when more doped boron is employed. (C) 2000 Elsevier Science Ltd. All rights reserved.
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