Abstract
Abstract The total energy distribution of field-emitted electrons from polyacrylonitrile carbon fibres and reactor graphite was investigated. Two peaks appeared in the total energy-distribution spectrum of the carbon fibre pyrolysed at 2500°C. In contrast, only one energy peak resulted from the carbon fibre re-pyrolysed at 3000°C and from the reactor graphite. The peak with a high energy is attributed to π electrons of graphite, while the other is attributed to σ electrons. This finding corresponds well with the results obtained by soft X-ray spectroscopy of carbon fibres. Re-pyrolysation of carbon fibres at 3000°C provides high graphitization which results in a disappearance of a electrons. Field-ion microscopical observations of highly graphitized carbon fibres showed the agglomeration of fibrils even at the central area of the fibre where electrons were field-emitted.
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