摘要： The selective extraction behavior of a water soluble polysilane derivative, polymethyl(1-undecylic acidyl)silane, towards metallic single-walled carbon nanotubes from the primarily purified arc-discharged sample is confirmed by Raman spectroscopy recorded with varying excitation laser wavelength. In line with the wavelength of the excitation laser the full assignment (n, m) for individual single-walled carbon nanotubes is made by referencing a Kataura plot, and these selectively extracted metallic carbon nanotubes are assigned to be of (13, 1), (14, 5), (15, 3), (21, 0) and (19, 1) chiral indices, which have larger diameters and smaller chiral angles than those reported previously. Moreover, it is evidenced that the width of Breit–Wigner–Fano G? band is directly correlated with the diameter distribution of metallic carbon nanotubes, and that metallic carbon nanotubes normally exhibit much enhanced D-band relative to semiconducting ones. It is also found that the G+, second order M and none dispersive IFM bands are largely up-shifted in comparison with those reported previously, which might be a result of the release of tube–tube interaction, the close helix wrapping of SWNTs by polymethyl(1-undecylic acidyl)silane and charge transfer between polymethyl(1-undecylic acidyl)silane and carbon nanotubes. Additionally, the dispersive IFM bands show a “step-like dispersive behavior,” offering another support for the success in selective extraction of SWNTs with small chiral angles.