Materiales carbonáceos para el estudio del transporte de carga en hilos moleculares y desarrollo de puntos cuánticos : transporte de carga en uniones moleculares grafeno-molécula-oro.

Abstract

Molecular electronics aims to create electronic devices that boost processing and storage capacity at a lower cost and in a smaller physical space, using molecules as the building blocks. Several researches of metalmolecule- metal molecular junctions with gold, silver, platinum, aluminum, and copper have provided mechanisms to understand the behavior of these components at the molecular scale. However, attention has shifted towards studying carbon-based molecular junctions, as carbon electrodes exhibit remarkable electrical, mechanical, thermal, and optical properties. In this contribution, the charge transport in the graphene-moleculegold molecular junction was studied. The graphene, commercially sourced, was obtained using chemical vapor deposition (CVD) on copper, while the gold electrode was made using the tip of a scanning tunneling microscope (STM). Using the I(s) method, one hundred current (I) versus distance (s) curves were recorded for voltages of ±300 mV , ±450 mV , and ±600 mV . The acquired data were subjected to meticulous statistical analysis to determine the average current of the molecular junction. Then, the current-voltage curve was constructed, revealing no rectifying behavior. Finally, the conductance in the ohmic region was calculated and compared with values reported in the literature.