Graphene Nanobubbles: MD approach
10 mei 2017
UAntwerpen, Campus Groenenborger, Building U, room U.241 - Groenenborgerlaan 171 - 2020 Antwerpen (route: UAntwerpen, Campus Groenenborger
16 - 17 uur
Organisatie / co-organisatie:
Condensed Matter Theory
Condensed Matter Theory seminar presented by Hossein Ghorbanfekr
In this talk, after a basic review of molecular dynamics (MD) simulations, I will present our recent numerical/experimental study of graphene nanobubbles in collaboration with School of Chemical Engineering and Analytical Science (the Manchester university). This work is accepted and will appear in Nature Communications.
Van der Waals (vdW) interaction between two-dimensional crystals (2D) can trap substances in high pressurized (of order 1 GPa) on nanobubbles. Increasing the adhesion between the 2D crystals further enhances the pressure and can lead to a phase transition of the trapped material. We found that the shape of the nanobubble can depend critically on the properties of the trapped substance. In the absence of any residual strain in the top 2D crystal, flat nanobubbles can be formed by trapped long hydrocarbons (i.e. hexadecane). For large nanobubbles with radius 130 nm, our atomic force microscopy measurements show nanobubbles filled with hydrocarbons (water) have a cylindrical symmetry (asymmetric) shape which is in good agreement with our molecular dynamics simulations. This study provides insights into the effects of the specific material and the vdW pressure on the microscopic details of graphene bubbles.
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