Circumventing the Stability Problems of Graphene Nanoribbon Zigzag Edges

TL;DR

This paper demonstrates chemical strategies to stabilize zigzag-edged graphene nanoribbons, enabling their air stability and reversible structural transformations, which is crucial for their integration into practical devices.

Contribution

It introduces chemical protection/deprotection methods and stable oxidized forms to overcome stability issues of zigzag graphene nanoribbons under ambient conditions.

Findings

Hydrogenation stabilizes chGNRs against air exposure.

Reversible conversion between oxidized and pristine forms via hydrogenation and annealing.

Potential for scalable integration of zigzag-edged nanostructures in devices.

Abstract

Carbon nanostructures with zigzag edges exhibit unique properties with exciting potential applications. Such nanostructures are generally synthesized under vacuum because their zigzag edges are unstable under ambient conditions: a barrier that must be surmounted to achieve their scalable exploitation. Here, we prove the viability of chemical protection/deprotection strategies for this aim, demonstrated on labile chiral graphene nanoribbons (chGNRs). Upon hydrogenation, the chGNRs survive an exposure to air, after which they are easily converted back to their original structure via annealing. We also approach the problem from another angle by synthesizing a chemically stable oxidized form of the chGNRs that can be converted to the pristine hydrocarbon form via hydrogenation and annealing. These findings may represent an important step toward the integration of zigzag-edged nanostructures in devices.