Fig. 1: STM characterization of (3,n,8)-GNRs on MgO/Ag(001).
From: Systematic modulation of charge and spin in graphene nanoribbons on MgO
a Chemical structures of the precursors and the resulting (3,1,8)- and (3,2,8)-GNRs. b STM topography (Vb = 0.5 V, It = 10 - 70 pA, image width 6 nm) of (3,1,8) (upper row) and (3,2,8) (bottom row) GNRs with L = 5 precursor units length on Ag(001) and on MgOML/Ag(001). c STM image (Vb = 0.5 V, It = 50 pA) of a MgOML island coexisting with GNRs synthesized over the regions of bare Ag(001). d, e Instances of successful atomic manipulation of GNRs from the Ag surface to the MgO island (Vb\(=\)0.5 V, It\(=\)50 pA). f dI/dV spectra of the L = 5 (3,1,8) and (3,2,8)-GNRs on Ag(001) and on the MgOML (stabilizationVb\(=\)0.5 V, It\(=\)100 pA, \({V}_{{\mathrm{mod}}}\) = 1 mV and 8 mV r.m.s. for spectra on MgO and Ag(001) respectively). The colour code indicates the positions in (b) where the spectra were acquired. Insets show the in-gap (\({V}_{b}=5\) mV) constant-height tunnelling current image of the GNRs on MgO. The green curve is an average of spectra taken along the dashed line in (b). g) High resolution dI/dV spectrum within the region enclosed by the dotted rectangle in (f) (stabilization \({V}_{b}=\)0.5 V, \({I}_{t}=\)200 pA and \({V}_{{\mathrm{mod}}}=\)0.5 mV r.m.s.).
