Anisotropic Etching and Nanoribbon Formation in Single-Layer Graphene

TL;DR

This paper presents a method for anisotropic etching of single-layer graphene using nickel nanoparticles, enabling the creation of nanoribbons with precise crystallographic edges while maintaining high material quality.

Contribution

The study introduces a novel anisotropic etching technique with nickel nanoparticles that produces high-quality graphene nanostructures with aligned edges and a unique catalytic channeling behavior.

Findings

Achieved sub-10nm graphene nanoribbons with controlled edge orientation

Observed a new catalytic channeling behavior preventing intersecting cuts

Maintained graphene quality after etching as confirmed by Raman and electronic measurements

Abstract

We demonstrate anisotropic etching of single-layer graphene by thermally-activated nickel nanoparticles. Using this technique, we obtain sub-10nm nanoribbons and other graphene nanostructures with edges aligned along a single crystallographic direction. We observe a new catalytic channeling behavior, whereby etched cuts do not intersect, resulting in continuously connected geometries. Raman spectroscopy and electronic measurements show that the quality of the graphene is resilient under the etching conditions, indicating that this method may serve as a powerful technique to produce graphene nanocircuits with well-defined crystallographic edges.