Caracterización eléctrica de uniones moleculares oro-molécula-grafeno.

Abstract

One of the alternatives to replace CMOS technology is Molecular Electronics; which proposes to use individual molecules located between two or three electrodes to form an electronic device. Until now, the tendency has been to use metal electrodes for the study of charge transport at molecular junctions. Although there are many advantages to using these electrodes, their use is limited due to their high production cost and the fact that they become polluting waste after their useful life. In recent years, the tendency to study molecular junctions formed from non-metallic electrodes has grown. In this work it is shown that the graphene obtained from electrochemical exfoliation can be used for the formation and study of molecular bonds. Two types of electrodes were fabricated: i) films incorporating nanosheets with a wide thickness distribution, prepared from the electrochemical exfoliation of graphite (P), and ii) films incorporating graphene nanosheets obtained from cascade centrifugation. in liquid phase; where a narrower thickness distribution (P2) is achieved. These electrodes were used to evaluate the conductance of graphene-molecule-gold junctions using a scanning tunneling microscope (STM). The results of this study show that the use of P-type nanosheets leads to lower conductance values with respect to junctions from gold. For their part, P2-type nanosheets lead to conductances comparable to gold-based junctions.