Abstract
Fluorine intercalation in nitrogen-substituted carbon C x N has been investigated at a temperature ranging from room temperature to 300°C. C 16N and C 14N yielded the fluorinated products with low C/ F ratios, C 3F under fluorine pressures of 1.0×10 5 and 0.5×10 5 Pa at room temperature. The intercalated fluorine decreased with decreasing nitrogen content in the host C x N, in particular at 0.25×10 5 Pa. X-ray powder diffraction data revealed that fluorine-intercalated C x N samples consisted of mixtures of several stages or mixtures with unreacted phase, having lower stages than those prepared from carbon. XPS and IR absorption spectra indicated the formation of semi-ionic C–F bonds. It was found that fluorine intercalation was much easier in C x N than in carbon between 50°C and 200°C. XPS and IR absorption spectra showed that C–F bonding varied from semi-ionic to covalent with increasing fluorination temperature from 50°C to 300°C. IR absorption spectrum suggested the formation of NF 2 groups at 300°C.
Published Version
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