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Volume 8, Issue 2 (Suppl) Chem Sci J 2017
ISSN: 2150-3494 CSJ, an open access journal Euro Chemistry 2017
May 11-13, 2017
May 11-13, 2017 Barcelona, Spain
4th European Chemistry Congress
The features of diamond nucleation on nanolevel prediction of diamondization of multilayered graphene
Pavel B Sorokin
National University of Science and Technology MISiS, Russian Federation
Since the isolation in 2004 graphene continues to attract significant attention from the scientific community. Despite of the fact
that graphene is under detailed investigation more than 10 years it still serve as a source for unusual effects. Here I will show that
multilayer graphene surface can be used a base for formation of diamond nanofilms [1] facilitated by chemical adsorption of adatoms
on the multilayer graphene surface, and explain how the pressure of phase transition is reduced and formally turns negative. For the
first time we obtain, by ab initio computations of the Gibbs free energy, a phase diagram (P, T ,h) of quasi-two-dimensional carbon—
diamond film versus multilayered graphene. It describes accurately the role of film thickness h and shows feasibility of creating
novel quasi-2D materials. In such “chemically induced” phase transition both chemistry and compression concurrently serve as the
driving factors for diamond film formation. I will continued to discuss this effect through the ultrastiff films with hexagonal diamond
(lonsdaleite) type structure and further show that under the particular external conditions and using particular adsorbate atoms
films with the specific structure can be formed [3]. The process of diamond phase nucleation was further investigated on the atomic
level. The critical size of graphene hydrogenated region which can initiate graphene diamondization was estimated. The nonlinear
dependence of size of graphene hydrogenated region upon the number of layers predicted the maximal thickness of the film which
can be formed by chemically induced phase transition [3]. This research was supported by Ministry of Education and Science of the
Russian Federation in the framework of Increase Competitiveness Program of NUST «MISiS» (№ К2-2015-033).
1. A.G. Kvashnin et al. Nano Letters 14 (2014) 676
2. . Antipina et al. J. Phys. Chem. C 119 (2015) 2828
3. S.V. Erohin et al. submitted (2017)
Biography
Pavel Sorokin has completed his PhD at the age of 25 years from Lebedev Physical Institute of RAS, Moscow and postdoctoral study from Rice University. He is
the leading researcher of Inorganic Nanomaterials Laboratory in National University of Science and Technology "MISIS". He has published more than 80 papers
in reputed journals.
Pavel B Sorokin, Chem Sci J 2017, 8:2(Suppl)