Phys.org June 15, 2022
It is a challenge to prepare large-sized single-crystal 2D carbon materials with moderate bandgaps to complement zero-bandgap graphene. Researchers in Chia prepared a single-crystal 2D carbon material, namely monolayer quasi-hexagonal-phase fullerene (C60) via an interlayer bonding cleavage strategy. In this monolayer polymeric C60, cluster cages of C60 are covalently bonded with each other in a plane, forming a regular topology that is distinct from that in conventional 2D materials. It exhibited high crystallinity and good thermodynamic stability, and the electronic band structure measurement revealed a transport bandgap of about 1.6 electronvolts. An asymmetric lattice structure endows monolayer polymeric C60 with notable in-plane anisotropic properties, including anisotropic phonon modes and conductivity. The 2D carbon material with a moderate bandgap and unique topological structure offers an interesting platform for potential application in 2D electronic devices…read more. TECHNICAL ARTICLE
Crystal structure of qHP C60 and qTP C60 determined by single-crystal XRD. Credit: Nature volume 606, pages507–510 (2022)Â