Abstract
In this contribution the modification of the electronic properties of single-walled carbon nanotubes (SWCNTs) filled with nickel bromide, cobalt bromide, and iron bromide was studied by Raman spectroscopy. The doping-induced alterations of the radial breathing mode (RBM) and G-mode in the Raman spectra of the filled SWCNTs were analyzed in detail. The observed shifts of the components of the Raman modes and changes of their profiles allowed concluding that the embedded compounds have an acceptor doping effect on the SWCNTs, and the doping level increases in the line with nickel bromide-cobalt bromide-iron bromide.
Highlights
The filling of single-walled carbon nanotubes (SWCNTs) is a promising approach for the modification of their electronic properties [1, 2]
Two main regions of the Raman spectra are shown: a radial breathing mode (RBM), which corresponds to synchronous radial vibrations of carbon atoms (A1g symmetry), and a G-band, which belongs to C–C bond vibrations (A, E1, and E2 symmetries [36]) [40]
The RBM band of the Raman spectrum of the pristine SWCNTs acquired at 1.58 eV contains two peaks at 157 and 171 cm−1 (Figure 1(a)), which are assigned to 1.5- and 1.4-nm metallic nanotubes, [41]
Summary
The filling of single-walled carbon nanotubes (SWCNTs) is a promising approach for the modification of their electronic properties [1, 2]. Metal halogenides (RuCl3 [3], KI [4], LiI, NaI, RbI, CsI, AgI [5], CoI2 [6], BaI2 [7], PbI2 [8], and MCl3, where M = La, Nd, Sm, Eu, Gd, Tb, Yb [9]), metals (Au, Pt, Pd [10], Ag [10,11,12], Bi [13], Fe [14], and Ru [3]), and organic molecules ((C5H5)2Fe [15], (C5H5)2Co, (C5H5C2H5)2Co [16], o-carborane [17], βcarotene [18], Zn(II), and Pt(II) porphyrin complexes [19]) were successfully encapsulated inside the SWCNT channels After these pioneer works, the electronic properties of filled nanotubes attracted further attention due to the large application potential of such nanostructures. The possibility to precisely tailor the electronic properties of SWCNTs by filling their channels makes these nanohybrids promising for applications, for instance, in electronic device architectures [34, 35]
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