Failure Processes in Embedded Monolayer Graphene under Axial Compression

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F14%3A00428888" target="_blank" >RIV/61388955:_____/14:00428888 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1038/srep05271" target="_blank" >http://dx.doi.org/10.1038/srep05271</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/srep05271" target="_blank" >10.1038/srep05271</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Failure Processes in Embedded Monolayer Graphene under Axial Compression

Popis výsledku v původním jazyce

Exfoliated monolayer graphene flakes were embedded in a polymer matrix and loaded under axial compression. By monitoring the shifts of the 2D Raman phonons of rectangular flakes of various sizes under load, the critical strain to failure was determined.Prior to loading care was taken for the examined area of the flake to be free of residual stresses. The critical strain values for first failure were found to be independent of flake size at a mean value of ?0.60% corresponding to a yield stress up to -6GPa. By combining Euler mechanics with a Winkler approach, we show that unlike buckling in air, the presence of the polymer constraint results in graphene buckling at a fixed value of strain with an estimated wrinkle wavelength of the order of 1?2 nm. These results were compared with DFT computations performed on analogue coronene/ PMMA oligomers and a reasonable agreement was obtained.

Název v anglickém jazyce

Failure Processes in Embedded Monolayer Graphene under Axial Compression

Popis výsledku anglicky

Exfoliated monolayer graphene flakes were embedded in a polymer matrix and loaded under axial compression. By monitoring the shifts of the 2D Raman phonons of rectangular flakes of various sizes under load, the critical strain to failure was determined.Prior to loading care was taken for the examined area of the flake to be free of residual stresses. The critical strain values for first failure were found to be independent of flake size at a mean value of ?0.60% corresponding to a yield stress up to -6GPa. By combining Euler mechanics with a Winkler approach, we show that unlike buckling in air, the presence of the polymer constraint results in graphene buckling at a fixed value of strain with an estimated wrinkle wavelength of the order of 1?2 nm. These results were compared with DFT computations performed on analogue coronene/ PMMA oligomers and a reasonable agreement was obtained.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

—

Projekt

<a href="/cs/project/GA14-15357S" target="_blank" >GA14-15357S: Modifikace elektronové struktury grafenu mechanickou deformací</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Scientific Reports

ISSN

2045-2322

e-ISSN

—

Svazek periodika

4

Číslo periodika v rámci svazku

JUN 2014

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

—

Kód UT WoS článku

000337226100009

EID výsledku v databázi Scopus

—