Controlled chemical oxidation of carbon fibres: An XPS–XAES–SEM study

High-modulus, polyacrylonitrile-derived carbon fibres were chemically oxidized in concentrated sulphuric acid containing potassium permanganate. The pre- and post-oxidation surface status of the fibres was characterized by x-ray photoelectron spectroscopy, x-ray-excited Auger spectroscopy and scanning electron microscopy. Tests were made to evaluate the effects of temperature, time of treatment and permanganate concentration. The overall results are discussed in terms of flexibility and easiness of the treatment and of reproducibility of the chemical composition of the oxidized fibre surface.

[1]  T. Cataldi,et al.  Remarks on the surface characterization of carbon fibres , 1992 .

[2]  D. Briggs,et al.  Primary and secondary oxygen-induced C1s binding energy shifts in X-ray photoelectron spectroscopy of polymers , 1992 .

[3]  U. Ceipidor,et al.  NEWDTP 2.2 : a versatile system for routine XPS data acquisition and analysis , 1991 .

[4]  P. Sherwood,et al.  X-ray photoelectron-spectroscopic studies of carbon fiber surfaces. 11. Differences in the surface chemistry and bulk structure of different carbon fibers based on poly(acrylonitrile) and pitch and comparison with various graphite samples , 1990 .

[5]  R. Allred,et al.  Electron spectroscopy of graphite, graphite oxide and amorphous carbon , 1988 .

[6]  K. Geib,et al.  Comparison of the CKLL first-derivative auger spectra from XPS and AES using diamond, graphite, SiC and diamond-like-carbon films , 1987 .

[7]  D. Hercules,et al.  Surface spectroscopic characterization of Cu/Al2O3 catalysts , 1985 .

[8]  J. Houston,et al.  Auger spectra of alkanes , 1980 .

[9]  C. Nordling,et al.  Valence Bands and Core Levels of the Isoelectronic Series LiF, BeO, BN, and Graphite Studied by ESCA , 1970 .

[10]  W. S. Hummers,et al.  Preparation of Graphitic Oxide , 1958 .

[11]  A. Salvi,et al.  XPS/XAES study of carbon fibres during thermal annealing under UHV conditions , 1992 .

[12]  T. Cataldi,et al.  XPS investigation of ultra-high-vacuum storage effects on carbon fibre surfaces , 1992 .

[13]  Salvatore Scaglione,et al.  Evaluation of the sp2/sp3 ratio in amorphous carbon structure by XPS and XAES , 1991 .

[14]  Michel Mermoux,et al.  FTIR and 13C NMR study of graphite oxide , 1991 .

[15]  C. Malitesta,et al.  A COMPARISON OF SOME ASYMMETRICAL LINE SHAPES FOR XPS DATA ANALYSIS , 1989 .

[16]  A. Shindo,et al.  Formation of graphite oxide from carbon fibers , 1986 .

[17]  J. Donnet,et al.  Carbon fibre in polymer reinforcement , 1977 .