Fig. 3: Electronic characteristics of alkali metal (AM) intercalated BLG.

a Photograph of sample prepared by vapor-phase intercalation. b Optical image of the BLG with prepatterned Au electrodes on a SiO2/Si substrate for intercalation and electrical transport measurements. c Raman spectra of C6K2C6, C6Rb2C6, C6Cs2C6, and BLG. d Id-Vg characteristics of C6K2C6, C6Rb2C6, and BLG measured at room temperature.