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Graphyne’s transformation: A new carbon form with potential for electronics

Scalable synthesis and characterization of new carbon crystals with a small direct band gap
Orthogonal to sheet plane views of AA, AB1, AB2, and ABC stacking arrangements for graphyne. Only the AA and AB1 packing modes are consistent with the interplanar reaction of triple bonds to form polyacetylene chains in reacted graphyne. Credit: Proceedings of the National Academy of Sciences (2025). DOI: 10.1073/pnas.2413194122

Graphyne is a crystalline form of carbon that is distinct from both diamond and graphite. Unlike diamond, where each atom possesses four immediate neighbors, or graphite, where each atom has three, graphyne’s structure combines two-coordinate and three-coordinate carbons.

Computational models suggest that graphyne has highly compelling electronic, mechanical and optical properties...

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