| 초록 |
Single-walled carbon nanotubes (SWCNTs) were fluorinated at several different temperatures. Single-walled carbon nanotubes were prepared by the conventional catalytic arc discharge. The change of atomic and electronic structures of fluorinated SWCNTs was investigated using X-ray photoelectron spectroscopy (XPS) and electrical resistivity measurements. The resistivity was measured by four-point probe method after palletizing the powder. The structure was analyzed by Fourier Transformed (FT) Raman Spectroscopy. XPS data show a clear binding energy shift towards the higher energy with increasing fluorination temperatures. At low temperature of up to 200 ℃, they show an ionic bonding character which implies the sidewall functionalization, whereas at high temperature the binding energy shifts to higher binding side, revealing a covalent bonding character of CFn, which implies resistivity increase by enhancing sp3 bonding and disintegration of nanotubes walls, as confirmed by the four-point resistivity. |
