N
2 adsorption and XPS elucidated the surface states of fluorinated activated carbon fiber (F-ACF) and fluorinated carbon black. The XPS examination showed that the C-F bonds are not ionic, but covalent. The N
2 adsorption isotherms of F-ACF was of Type I and the adsorption was predominant at a low P/P
0 region, although the total adsorption amount of F-ACF decreased. The fluorination reduced the pore width of ACF by 0.21nm. Only external nanographitic layers of three stacking sheets were fluorinated, considering from the crystallite size from X-ray diffraction and the chemical analysis. The increase of the pore-wall thickness by the fluorination of the nanographitic sheets agreed with the decrease of the pore width by fluorination. Adsorption isotherms of H
20, CH
3OH, and C
2H
5OH were measured. The fluorinated ACF showed a perfect hydrophobicity. Also adsorption isotherms of CH
3OH and C
2H
5OH on F-ACF had an S-shaped nature at the low P/P
0 region, while their adsorption isotherms ofACF were of Type I.
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