Directly observable G band splitting in Raman spectra from individual tubular graphite cones

Individual tubular graphite cones (TGCs) are characterized using Raman spectroscopy at room temperature. A split G band at 1569 − 1587 cm is directly observed from the root to the tip of TGCs without requiring surface electromagnetic and chemical enhancement effects. The G band can be deconvoluted into two Lorentzian peaks at 1571 ± 2 and 1584 ± 3 cm, which may be attributed to the resonance enhancement of a single chirality excitation between the innermost tubes and other constituent tubes of the TGCs, respectively. Results suggest that the splitting of G band can be envisaged as a fingerprint for monochirality of tubular carbon nanomaterials. _______________________________________________________________________