Vibrational properties of graphdiynes as 2D carbon materials beyond graphene

Abstract

Two-dimensional (2D) hybrid sp-sp2 carbon systems are an appealing subject for science and technology. For these materials, topology and structure significantly affect electronic and vibrational properties. We investigate here by periodic density-functional theory (DFT) calculations we here investigate the Raman and IR spectra of 2D carbon crystals belonging to the family of graphdiynes (GDYs) and having different structures and topologies. By joining DFT calculations with symmetry analysis, we assign the IR and Raman modes in the spectra of all the investigated systems. On this basis, we discuss how the modulation of the Raman and IR active bands depends on the different interactions between sp and sp2 domains. The symmetry-based classification allows identifying the marker bands sensitive to the different peculiar topologies. These results show the effectiveness of vibrational spectroscopy for the characterization of new nanostructures, deepening the knowledge of the subtle interactions that take place in these 2D materials.

References in corpus (7)

• Synthesis of a mesoscale ordered 2D-conjugated polymer with semiconducting properties
• Electronic, optical and thermal properties of highly stretchable 2D carbon Ene-yne graphyne
• Structural, Electronic, and Vibrational Properties of 2D Graphdiyne-Like Carbon Nanonetwork Synthesized on Au(111): Implications for the Engineering of sp-sp2 Carbon Nanostructures
• Topology-dependent conjugation effects in graphdiyne molecular fragments
• Raman and IR spectra of graphdiyne nanoribbons
• High-Chern-number bands and tunable Dirac cones in $\beta$-graphyne
• Graphdiynes interacting with metal surfaces: first-principles electronic and vibrational properties