Structural and Charge Transport Properties of Molecular Tunneling Junctions with Single-Layer Graph ene Electrodes

Herein, we present Raman spectroscopy of chemically grafting aryl diazonium molecules onto single-layer graphene (SLG) and charge transport characteristics of the aryl alkane monolayers sandwiched between the SLG electrodes in an electrode/monolayers/electrode motif. Our spectroscopic characterization shows that the aryl component molecules were incorporated as an effective tunnel barrier into the SLG electrodes-based molecular junctions. The temperature-variable and length-dependent transport measurements clearly demonstrate that tunneling occurs through the SLG/monolayers/SLG junctions and the current density can be modulated with a correct decay coefficient (β) by the length of a molecular tunneling barrier.