[institut] Подсећање: предавање проф. Марко Краљ, среда 12.10.2016. у 13:00

[Marko Spasenovic]

Поштоване колеге,

Позивамо Вас на предавање које ће у среду, 12. октобра 2016. у 13:00
одржати Марко Краљ (Институт за физику у Загребу) у читаоници библиотеке
"др Драган Поповић". Наслов и апстракт (на енглеском) следе:

*Controlling the binding interaction and doping of epitaxial graphene at
nano- and micro-scales*

The ability to control the growth and/or modifications of novel
two-dimensional (2D) materials in situ at the micro- and nano-scale, opens
flexibility in design of 2D materials applications.

We use epitaxial graphene on Ir(111) [1] as a model system to explore
deposition of atoms and molecules leading to intercalation where species
are pushed between graphene and its support. Generally, properties of many
layered 2D materials can be manipulated by intercalation. Besides the
charge transfer, the intercalation can affect the binding interaction and
further properties of graphene, e.g. chemical reactivity [2] or magnetism.
We resolve the microscopic mechanism and dynamics of intercalation process
in great detail by studying intercalation and entrapment of alkali atoms
under epitaxial graphene on Ir(111) in real and reciprocal space by means
of LEEM (in situ), STM, ARPES, LEED and vdW-DFT, and find that the
intercalation is adjusted by the van der Waals interaction, with the
dynamics governed by defects anchored to graphene wrinkles [3].

In a connected study, by using vicinal Ir substrate, we find that the vdW
interaction and increased density of anchoring step lines governs a
pronounced mesoscopic faceting of stepped substrates upon graphene growth
by setting a balance in a competition between an uniaxial strain and
graphene binding, the mechanism which should be of relevance for other 2D
vdW epitaxial systems and their strain engineering [4].

[1] I. Pletikosić et al., Phys. Rev. Lett. 102, 056808 (2009).

[2] S. Schumacher et al., Nano Lett. 12, 5013-5019 (2013).

[3] M. Petrović et al., Nat. Commun. 4, 2772 (2013).

[4] I. Šrut Rakić et al., Carbon 110, 267-277 (2016).


Са поштовањем,

др Марко Спасеновић
Научни сарадник Института за физику
Прегревица 118, 11080 Београд
www.graphene.ac.rs
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