Raman Spectroscopy Study of the Doping Effect of the Encapsulated Iron, Cobalt, and Nickel Bromides on Single-Walled Carbon Nanotubes

Figure 2

The fitting of the RBM- and G-bands of the Raman spectra of the pristine SWCNTs (a), NiBr₂@SWCNT (b), CoBr₂@SWCNT (c), and FeBr₂@SWCNT (d) samples acquired at a laser energy of 1.58 eV. The RBM-bands include two components, which belong to the nanotubes of different diameters. The G-bands include one component of metallic SWCNTs (G⁻ at the lowest frequencies) and two components of semiconducting SWCNTs ( at lower and at higher frequencies).

(a) SWCNT ( eV)

(b) NiBr₂@SWCNT ( eV)

(c) CoBr₂@SWCNT ( eV)

(d) FeBr₂@SWCNT ( eV)