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

Table 1

The positions (RS) and relative intensities () of the components of the RBM-bands (C 1 and C 2) and G-bands (metallic and semiconducting and ) of the Raman spectra of the pristine SWCNTs, NiBr₂@SWCNT, CoBr₂@SWCNT, and FeBr₂@SWCNT samples, acquired at laser energies of 1.58 eV and 1.96 eV. In the parentheses the shifts of the component positions in comparison to ones of the pristine SWCNTs are given. The experimental error in the component positions equals ±0.5 cm⁻¹.

	RBM-band, cm^−1				G-band, cm^−1
Sample	С 1		С 2		G^−
	RS		RS		RS		RS		RS
= 1.58 eV
SWCNT	157	0.59	171	0.41	1556	0.44	1571	0.15	1593	0.41
NiBr2@SWCNT	157	0.25	171	0.75	1557 (+1)	0.09	1576 (+5)	0.23	1601 (+8)	0.68
CoBr2@SWCNT	159 (+2)	0.23	171	0.77	1558 (+2)	0.08	1577 (+6)	0.11	1602 (+9)	0.81
FeBr2@SWCNT	160 (+3)	0.13	172 (+1)	0.87	1560 (+4)	0.05	1578 (+7)	0.07	1606 (+13)	0.88
= 1.96 eV
SWCNT	151	0.34	169	0.66	1546	0.47	1565	0.16	1591	0.37
NiBr2@SWCNT	164 (+13)	0.46	175 (+6)	0.54	1554 (+8)	0.12	1575 (+10)	0.27	1602 (+11)	0.61
CoBr2@SWCNT	165 (+14)	0.35	177 (+8)	0.65	1556 (+10)	0.05	1576 (+11)	0.10	1604 (+13)	0.85
FeBr2@SWCNT	164 (+13)	0.40	176 (+7)	0.60	1558 (+12)	0.04	1578 (+13)	0.10	1606 (+15)	0.86