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 1569–1587cm−1 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±3cm−1, which may be attributed to the resonance enhancement of a single chirality excitation in the innermost tubes and all 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.