Nanoscale irregularity analysis of carbon fibre surfaces with a high-resolution alpha(S)-plot

摘要

Exfoliated carbon fibres (ECFs) were prepared from preheated mesophase pitch-based carbon fibre by electrochemical treatment. The nitrogen adsorption isotherms on ECFs were measured at 77 K. All the nitrogen adsorption isotherms were transformed into alpha(S)-plots using the standard adsorption isotherms for carbon blacks of different crystallinities and the GCMC simulation isotherm. Using the standard isotherm of well-crystallized carbon black, the as plot for the ECF prepared from carbon fibre preheated at 3273 K was almost linear, while alpha(S)-plots obtained using the standard isotherm of well-crystallized carbon black and the simulated form had have a downward and an upward deviation, respectively. The alpha(S)-plots of carbon samples having similar nanoscale crystallite sizes were close to each other, showing that alpha(S)-plot analysis was effective for determining the average surface irregularity structure in the nanoscale range.