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Using Graphene Liquid Cell Transmission Electron Microscopy to Study in Situ Nanocrystal Etching

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Atomistic study of the solid state inside graphene nanobubbles.

Evgeny Iakovlev¹, Petr Zhilyaev², Iskander Akhatov²

¹Center for Design, Manufacturing and Materials, Skolkovo Institute of Science and Technology, Moscow, Russia. Evgeny.Iakovlev@skolkovotech.ru.

Scientific Reports

|December 22, 2017

Summary

This summary is machine-generated.

Graphene nanobubbles trapping argon atoms were studied using molecular dynamics (MD). Simulations revealed universal shapes for larger bubbles and a unique "pancake" shape for the smallest ones, consistent with elastic membrane theory.

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Area of Science:

Materials Science
Surface Science
Nanotechnology

Background:

Two-dimensional (2D) materials on flat substrates can form surface nanobubbles.
These nanobubbles can trap various substances.
Understanding nanobubble behavior is crucial for materials science applications.

Purpose of the Study:

To investigate the structural properties of graphene nanobubbles containing argon atoms.
To explore the phase behavior of trapped argon within nanobubbles.
To compare simulation results with experimental observations and theoretical models.

Main Methods:

Utilizing molecular dynamics (MD) simulations.
Modeling graphene nanobubbles with radii ranging from 7 to 34 nm.
Analyzing the shape, internal pressure, and phase state of trapped argon.

Main Results:

Graphene nanobubbles (except the smallest) exhibit a universal shape, with a constant height-to-radius ratio.
Argon atoms form a solid, close-packed phase within the nanobubbles, despite low internal pressure.
The smallest nanobubbles (7 nm radius) display an unusual "pancake" shape.

Conclusions:

The observed universal shape of larger nanobubbles aligns with elastic membrane theory and experimental findings.
The solid phase of argon within nanobubbles suggests unique confinement effects.
The "pancake" shape in small graphene nanobubbles is a novel observation, potentially linked to phenomena seen at liquid-hydrophobic interfaces.