Key Findings
The study reports the on-surface synthesis of planar carbon pentaheptite nanoribbons (CPHNs), achieving a covalent metal in a one-dimensional form. Specifically, the researchers identified two distinct types of narrow ribbons: CPHN 1, which is an intrinsic metal, and CPHN 2, which functions as a narrow-bandgap semiconductor. CPHN 1 exhibits near-ballistic conductance that approaches one conductance quantum, a level of performance comparable to metallic carbon nanotubes.
Technical Details
The synthesis utilized a hierarchical approach to create the planar structures. The process involved the lateral fusion of well-aligned polypentalene chains, which were transformed from pre-synthesized polycyclooctadiene chains. Both CPHN 1 and CPHN 2 share a basal structure consisting of a central heptagon chain. The distinction between the two types lies in the orientation of the polypentalene chains flanking the central chain: they are oriented identically in CPHN 1 and differently in CPHN 2.
Background & Context
Atomically defined one-dimensional conductors are highly sought after for use in future carbon-based electrodes and interconnects. While metallic graphene nanoribbons have previously been realized through band engineering and zero-mode superlattices, metallic nanoribbons composed of fully non-benzenoid carbon allotropes—such as the theorized carbon pentaheptites—had remained unexplored until this report.
Significance & Outlook
The realization of CPHNs enables the bottom-up fabrication of all-carbon electronics. These metallic ribbons are compatible with existing nanographenes and semiconducting graphene nanoribbons. While CPHN 1 is highlighted as a promising planar carbon metal and a candidate for carbon quantum wires, the authors note that further synthetic optimization is required before these materials can be integrated into functional devices.
Source: https://doi.org/10.1038/s41586-026-11202-2
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