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DTSTAMP:20260425T092621Z
UID:1699956000@ist.ac.at
DTSTART:20231114T110000
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DESCRIPTION:Speaker: Valentin O. Rodionov\nhosted by Rafal Klajn\nAbstract:
  The unique ability of carbon to bond with itself forming extended chains 
 and networks underlies the structural complexity of organic matter. This c
 omplexity extends to elemental carbon. Several hundred crystalline carbon 
 phases have been theoretically predicted to date. However\, few of these m
 aterials have been realized experimentally. Advances in the synthesis of n
 onbenzenoid and sp1-containing allotropes have been especially limited. On
 e of such allotropes is γ-graphyne\, an sp2/sp1 carbon lattice which can 
 be viewed as graphene uniformly expanded through insertion of two-carbon a
 cetylenic units.  y-Graphene is predicted to be a semiconductor with a m
 oderate band gap\, ultrafast charge carrier mobility comparable to that of
  graphene\, and high thermal conductivity. Recently our group reported th
 e synthesis of multilayer γ-graphyne through crystallization-assisted irr
 eversible polymerization. While conventional 2D polymerizations and reticu
 lar chemistry rely on error correction through reversibility\, we demonstr
 ated that a covalent lattice of high quality can be synthesized under pure
 ly kinetic control. Initial experiments indicate that γ-graphyne is a sem
 iconductor with a bandgap of ~0.5 eV. The crystal structure features aperi
 odic sheet stacking with an interlayer distance of 3.48 Å. The material i
 s thermally stable up to 240 °C but undergoes a rapid photochemical trans
 formation under green or longer-wavelength light. In this presentation\, I
  shall discuss our recent progress in exploring the physical and chemical 
 properties of this novel form of carbon.
LOCATION:Sunstone Building - Big Seminar Room B \, ISTA
ORGANIZER:
SUMMARY:Valentin O. Rodionov: Synthesis and Characterization of γ-Graphyne
 \, a Novel Allotrope of Carbon
URL:https://talks-calendar.ista.ac.at/events/4503
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