"Narrow" Graphene Nanoribbons Made Easier by Partial Hydrogenation

TL;DR

This study demonstrates that partial hydrogenation of wide graphene nanoribbons can effectively mimic the properties of narrow GNRs, simplifying synthesis and enabling practical applications.

Contribution

The paper reveals that partial hydrogenation can transform wide GNRs into electronic and magnetic states similar to narrow GNRs, reducing the need for precise narrow ribbon fabrication.

Findings

Hydrogenation begins at edges and spreads inward in GNRs.

Partially hydrogenated wide GNRs exhibit properties akin to narrow GNRs.

Partial hydrogenation offers a scalable approach to tailor GNR properties.

Abstract

It is a challenge to synthesize graphene nanoribbons (GNRs) with narrow widths and smooth edges in large scale. Our first principles study on the hydrogenation of GNRs shows that the hydrogenation starts from the edges of GNRs and proceeds gradually toward the middle of the GNRs so as to maximize the number of carbon-carbon $\pi$-$\pi$ bonds. Furthermore, the partially hydrogenated wide GNRs have similar electronic and magnetic properties as those of narrow GNRs. Therefore, it is not necessary to directly produce narrow GNRs for realistic applications because partial hydrogenation could make wide GNRs "narrower".