Biphenylene Sheet: A Nonbenzenoid Carbon Allotrope

Abstract

The quest for planar sp2-hybridized carbon allotropes other than graphene, such as graphenylene and biphenylene sheet, has stimulated substantial research efforts because of the materials' predicted unique mechanical, electronic and transport properties. However, their synthesis remains challenging due to the lack of reliable protocols for generating non-hexagonal rings during the in-plane tiling of carbon atoms. Here, we report the bottom-up growth of ultra-flat biphenylene sheet with periodically arranged four-, six-, and eight-membered rings of sp2 carbon atoms, via an unprecedented on-surface inter-polymer hydrogen fluoride (HF)-zipping reaction. The characterization of this biphenylene sheet by scanning probe methods solves the long-standing controversy over its dielectric or metallic nature. We expect the inter-polymer HF-zipping method to complement the toolbox for the synthesis of other nonbenzenoid carbon allotropes.

Highly efficient hydrogen storage of a Sc decorated biphenylene monolayer near ambient temperature: ab initio simulations

“…3.1 Biphenylene structure: First, a unit cell of Biphenylene (BPh) is modeled such that its chemical structure overlaps with STM images of experimental works [86]. We optimized a 2x2x1 supercell of BPh structure with lattice constant a=4.52Å and b=3.76Å of the rectangular unit, which has space group Pmmm [67].…”

2D Boron Carbide, Carbon Nitride, and Silicon Carbide: A Theoretical Prediction

“…It is worth mentioning here that many theoretically predicted carbon allotropes and 2D carbides have already been successively synthesized nowadays, e.g., T-carbon, 58,59 γgraphyne, 60,61 biphenylene network, 62,63 2D C 3 N, 64,65 and many others. In the previous theoretical work, 43 the pristine Me-graphene is considered as the topologically assembling structure of the molecule C−(C 3 H 2 ) 4 .…”

Enhancing the Mechanical Stability of 2D Fullerene with a Graphene Substrate and Encapsulation

“…Carbon-based materials have garnered significant attention due to their versatile and promising applications, in particular, extensive research has focused on the exploration of two-dimensional (2D) carbon materials [ 1 , 2 , 3 ]. The excellent mechanical properties have been widely studied in many aspects, for example, the tensile strength on monolayer and bilayer graphene, the defect influence, the magic angle graphene and the phase transition induced by strain [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. On the other hand, the fullerene system is one of the prominent candidates for future electronic applications as recently proposed in [ 26 ].…”