Stable three-dimensional metallic carbon with interlocking hexagons

Abstract

The authors note that, due to a printer's error, references 41-50 appeared incorrectly. The corrected references follow. The authors note: "Our paper unfortunately missed reference to an earlier suggestion of the T6 structure (43). This work entitled 'A hypothetical dense 3,4-connected carbon net and related B 2 C and CN 2 nets built from 1,4-cyclohexadienoid units' by M. J. Bucknum and R. Hoffmann was published in J Am Chem Soc 116: 11456-11464 (1994), where the electronic structure of a hypothetical 3,4-connected tetragonal allotrope of carbon is discussed. The results in this article are consistent with what we find. The same group had also suggested a metallic carbon structure (44) that was published in J Am Chem Soc 105: 4831-4832 (1983), which we also missed to cite. We thank Prof. Hoffmann for bringing these papers to our attention."The complete references appear below. www.pnas.org/cgi

Homo Citans and Carbon Allotropes: For an Ethics of Citation

“…It was entitled “Stable three‐dimensional metallic carbon with interlocking hexagons”, authored by S. Zhang, Q. Wang, X. Chen, and P. Jena 110. The first Figure in the article looked awfully familiar.…”

Penta-graphene: A new carbon allotrope

“…When stacked in different patterns, stable 3D twin structures of T12-carbon are generated with band gaps even larger than that of T12-carbon. The versatility of penta-graphene and its derivatives are expected to have broad applications in nanoelectronics and nanomechanics.carbon allotrope | carbon pentagon | stability | negative Poisson's ratio | electronic structure C arbon is one of the most versatile elements in the periodic table and forms a large number of allotropes ranging from the well-known graphite, diamond, C 60 fullerene (1), nanotube (2), and graphene (3) to the newly discovered carbon nanocone (4), nanochain (5), graphdiyne (6), as well as 3D metallic structures (7,8). The successful synthesis of graphene (3) has triggered considerable interest in exploring novel carbon-based nanomaterials.…”

“…From zero-dimensional nanoflakes or nanorings (13) to 1D nanotube, 2D graphene, and 3D graphite and metallic carbon phases (7,8), hexagon is the only building block. Extended carbon networks composed of only pentagons are rarely seen.…”

Multiporous carbon allotropes transformed from symmetry-matched carbon nanotubes

“…Besides the well-known diamond, graphite, fullerenes, 1 carbon nanotube(CNTs), 2 amorphous carbon 3 and graphene, 4,5 many other carbon allotropes have been presented in the past decade, including graphdiyne, 6 bcc-C6, 7 HOP graphene, 8 oC32, 9 net W carbon, 10 H-net, 11 GT-8 and CT-12, 12 sp 2 -diamond and cubic-graphite, 13 oP24-I, oP24-II, oP20, oP28, mP16 and mS32, 14 T-carbon, 15 OPG-L and OPG-Z, 16 hexagon-preserving carbon foams, 17 O-carbon, 18 amorphous diamond, 19 R and P carbon, 20 hP3 tI12, and tP12, 21 yne-carbon and tetrayne-carbon, 22 T graphene, 23 oC16, 24 X-carbon and Y-carbon, 25 bct C 4 , 26 carbon schwarzites, 27 K 4 -carbon, 28 T 6 and T 14 -carbon. 29 Their mechanical and electrical properties vary significantly from superhard to soft and from metallic to insulating, which enriches the real applications of carbon materials tremendously. For instance, the diamond is a superhard and insulating material.…”

“…However, graphene is a soft semimetal 4,5 and the net W carbon, K 4 crystal carbon, T 6 -carbon, T 14 -carbon, GT-8 and CT-12 are reported to be metallic carbon. 10,12,28,29 The hP3 and tI12 are the densest carbon crystals, 21 but carbon schwarzites, T-Carbon, T 6 and T 14 -Carbon are lightweight carbon materials. 15,27,29 Among all carbon allotropes experimentally synthesized, graphdiyne occupies an important position not only because of its many potential applications, such as lithium storage 30 and hydrogen purification, 31 but also because of its high free energy.…”