Van-der-Waals-forces-modulated graphene-P-phenyl-graphene carbon allotropes

HX Li and HT Chen and BY Pang and JC Zhang and BC Luo and SRP Silva and YC Wang and SY Zhao and PR Shearing and JB Robinson and KS Novoselov, NATURE COMMUNICATIONS, 16, 10011 (2025).

DOI: 10.1038/s41467-025-64971-1

Graphene has received much attention due to its monoatomic, unique two- dimensional structure, which results in remarkable mechanical, physical, and electrical properties. However, synthesizing high-quality graphene- based composites with high conductivity and ionic mobility remains challenging. Here, we report an allotrope to the nanocarbon family, Graphene-P-phenyl-Graphene, synthesized by inserting pi-pi-conjugated p-phenyls between graphene layers and connecting them via C-C sigma bonds. Graphene-P-phenyl-Graphene is thermally and dynamically stable, as verified by density functional theory and molecular dynamics, and can be produced at kilogram scale. The p-phenyl bridges swell the layer spacing from similar to 0.34 to similar to 0.56 nm, reducing van der Waals forces and enhancing electron delocalization. Electrons in these separated graphene layers benefit from low mass and efficient 3D screening of charge scattering, resulting in high Hall mobility (10,000-13,000 cm(2) V-1 s(-1)) in freestanding films. The expanded spacing also enables decoupling of layer electrons and rapid ion storage and transport-even for large ions. For example, potassium-ion batteries using Graphene-P-phenyl-Graphene exhibit high reversible capacity, long- term stability, and high charge-discharge rates. Graphene-P-phenyl- Graphene holds promise for large-scale, portable, high-performance electronics with energy storage capabilities.

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