Spiro-Carbon: A Metallic Carbon Allotrope Predicted from First Principles Calculations |
| |
Authors: | Felipe L. Oliveira Prof. Dr. Rodrigo B. Capaz Prof. Dr. Pierre M. Esteves |
| |
Affiliation: | 1. Instituto de Química, Universidade Federal do Rio de Janeiro, Av. Athos da Silveira Ramos 149, Cidade Universitária, Rio de Janeiro, RJ, 21941-909 Brazil;2. Instituto de Física, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, Rio de Janeiro, RJ, 21941-972 Brazil |
| |
Abstract: | A structurally stable microporous metallic carbon allotrope, poly(spiro[2.2]penta-1,4-diyne) or, for short, spiro-carbon, with I41/amd (D4h) symmetry is predicted by first-principles calculations using density functional theory (DFT). The calculations of electronic, vibrational, and structural properties show that spiro-carbon has lower relative energy than other elusive carbon allotropes such as T-Carbon and 1-diamondyne (Y-Carbon). Its structure can be pictured as a set of trans-cisoid-polyacetylene chains tangled and interconnected together by sp3 carbon atoms. Calculations reveal a metallic electronic structure arising from an “intrinsic doping” of trans-cisoid-polyacetylene chains with sp3 carbon atoms. Possible synthetic routes and various simulated spectra (XRD, NMR, and IR absorption) are provided in order to guide future efforts to synthesize this novel material. |
| |
Keywords: | carbon allotrope conductive carbon 3D carbon allotrope density functional calculations nanoporous carbon |
|
|