Raman Spectra of BxNyCz ‐ Nanotubes: Correlation between B, N ‐ Content and Frequency Shifts of the G‐band

Boron and nitrogen doped carbon nanotubes (BxNyCz ‐ NTs) were synthesized with high doping levels up to x ∼ 0.4 and y ∼ 0.3, respectively, using the substitution reaction between single‐wall CNTs and B2O3 in NH3 atmosphere. Along with the intensity increase of the D‐peak in Raman spectra, we observe for B and N doping considerable changes in the G‐peak positions. In a first approximation these effects might be attributed to a simple mass‐dependence of the phonon frequency and a lower symmetry of the system due to the incorporation of B and N atoms. We derive empirical correlations between the frequency shifts of the G‐band and the B, N‐content using a combination of micro‐Raman technique and EDX element analysis.