![]() ![]() Electric field effect in atomically thin carbon films. Crystal structure and bonding of ordered C 60. Interface characterization and control of 2D materials and heterostructures. More broadly, the synthesis of extended carbon structures by polymerization of molecular precursors charts a clear path to the systematic design of materials for the construction of two-dimensional heterostructures with tunable optoelectronic properties. Furthermore, imaging few-layer graphullerene flakes using transmission electron microscopy and near-field nano-photoluminescence spectroscopy reveals the existence of moiré-like superlattices 3. We explore the thermal conductivity of this material and find it to be much higher than that of molecular C 60, which is a consequence of the in-plane covalent bonding. The synthesis entails growing single crystals of layered polymeric (Mg 4C 60) ∞ by chemical vapour transport and subsequently removing the magnesium with dilute acid. We report charge-neutral, purely carbon-based macroscopic crystals that are large enough to be mechanically exfoliated to produce molecularly thin flakes with clean interfaces-a critical requirement for the creation of heterostructures and optoelectronic devices 2. Its constituent fullerene subunits arrange hexagonally in a covalently interconnected molecular sheet. Here we introduce graphullerene, a two-dimensional crystalline polymer of C 60 that bridges the gulf between molecular and extended carbon materials. By mixing different hybridizations and geometries of carbon, one could conceptually construct countless synthetic allotropes. The two natural allotropes of carbon, diamond and graphite, are extended networks of sp 3-hybridized and sp 2-hybridized atoms, respectively 1. ![]() Nature volume 613, pages 71–76 ( 2023) Cite this article A few-layer covalent network of fullerenes ![]()
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