Tailoring the atomic structure of graphene nanoribbons by STM lithography

TL;DR

This paper demonstrates precise patterning of graphene nanoribbons using STM lithography, enabling control over their atomic structure and electronic properties for potential room-temperature nano-electronic devices.

Contribution

It introduces a method for atomically precise patterning of graphene nanoribbons with controlled width and orientation, advancing nano-electronic device fabrication.

Findings

Achieved nanometer-precision patterning of GNRs and junctions

Observed confinement gaps up to 0.5 eV enabling room temperature operation

Demonstrated potential for fully integrated nano-electronic circuits

Abstract

The practical realization of nano-scale electronics faces two major challenges: the precise engineering of the building blocks and their assembly into functional circuits. In spite of the exceptional electronic properties of carbon nanotubes only basic demonstration-devices have been realized by time-consuming processes. This is mainly due to the lack of selective growth and reliable assembly processes for nanotubes. However, graphene offers an attractive alternative. Here we report the patterning of graphene nanoribbons (GNRs) and bent junctions with nanometer precision, well-defined widths and predetermined crystallographic orientations allowing us to fully engineer their electronic structure using scanning tunneling microscope (STM) lithography. The atomic structure and electronic properties of the ribbons have been investigated by STM and tunneling spectroscopy measurements. Opening of confinement gaps up to 0.5 eV, allowing room temperature operation of GNR-based devices, is reported. This method avoids the difficulties of assembling nano-scale components and allows the realization of complete integrated circuits, operating as room temperature ballistic electronic devices.