The transmission spectrum of pristine 6ZGNRH is shown in Figure (a). The transmission spectrum reveals that 6ZGNRH shows a transmission gap (T (E) = 0 e 2 h ) of 0.61 eV at the Fermi level and a plateau-like conductance. Since electron transmission is directly associated with the density of states in the scattering region. A comparison of the density of states (Figure ) of pure 6ZGNRH with the transmission spectra demonstrates that the transmission gap corresponds to the band gap (0.61 eV ) of 6ZGNRH at the Fermi level. The transmission spectra show an increase in transmittance away from the transmission gap which is in accordance with the increase in density of states of 6ZGNRH away from the energy gap. Apart from that, the plateau-like conductance feature originates from the multi-channel ballistic transport of electrons. The conductance changes in integral steps depending on the number of transmission channels which is proportional to the number of occupied transverse sub-bands. For 6ZGNRH, the conductance plateau shows a height of 2 h . Further, an increase in the height of the conductance plateau in the energy range (-2.22 eV , -1.46 eV ) and (1.44 eV , 1.94 eV ) is due to an increase in the number of sub-bands shown with vertical green dotted lines in Figure . This step behavior of GNRs is also discussed in detail in our previous work. Further, T (E) reveals no spin polarization in pristine 6ZGNRH despite the presence of magnetic moments at the edge carbon atoms. This shows that spin-filtering effects cannot be produced by pristine ZGNRs because of spin-degenerate energy levels.