Scalable Growth of Gamma-Graphyne Under Purely Kinetic Control NathanEChapman cwru UT_Dallas StanfordMSE dante_zakhidov SSRLnews unicampoficial Crystals BandGap graphene
By Bhavna KavetiSep 28 2022Reviewed by Susha Cheriyedath, M.Sc. γ-graphyne is a symmetrical carbon allotrope with sp1 and sp2 hybridized carbon atoms and is viewable when graphene expands uniformly with its aromatic rings separated by two-carbon acetylenic units. The synthesis of γ-graphyne in the form of an extended crystal lattice remains challenging.
Here, the new carbon phase was characterized using various analytical methods. The results indicated that the prepared γ-graphyne was a semiconductor with a 0.48 electronvolts band gap and had a hexagonal α-axis and interlayer spacings of 6.88 angstroms and 3.48 angstroms, respectively, which aligned with the theoretical predictions.
Related Storiesγ-Graphyne is a fundamental homolog of graphyne-n . Single-layered γ-graphyne is a semiconductor with a reasonable bandgap, rapid charge carrier mobility, excellent thermal conductivity, and outstanding strength. These characteristics suggest that γ-graphyne could be a foundation for next-generation carbon-based electronics.
Like other Pd-catalyzed cross-coupling reactions, the mechanism of the Sonogashira reaction process involves a homogeneous Pd0 catalytic cycle. Therefore, it is difficult to limit this chemistry to the template surface. As each monomer unit "clicks" into place, this method would avoid the kinetic dead end of partially linked intermediates and endows a self-repairable polymerization. Defects in the developing lattice were the most reactive locations due to local strain and distortions, eased by multisite interaction with the monomer.
However, considering the frequently observed micron-scale γ-graphyne crystallites, random three-dimensional development was preferred over 2D polymerization, which was a kinetically favored crystallization. Additionally, this indicated that the first nucleation of flat graphene sheets was a highly probable event.
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