Negative Poisson's ratio in graphene oxide.

Area of Science:

• Materials Science
• Nanotechnology
• Computational Chemistry

Background:

• Graphene oxide (GO) is a promising material with tunable properties.
• Understanding the mechanical behavior of GO, such as its Poisson's ratio, is crucial for its applications.

Purpose of the Study:

• To investigate the Poisson's ratio of graphene oxide using molecular dynamics simulations.
• To determine how the degree of oxidation affects the Poisson's ratio of GO.

Main Methods:

• Molecular dynamics simulations were employed.
• The simulations focused on varying the degree of oxidation in graphene oxide.

Main Results:

• The Poisson's ratio of GO decreases linearly with increasing oxidation.
• A negative Poisson's ratio was observed at room temperature for an oxidation degree of 0.27.
• A Poisson's ratio of -0.567 was reached for fully oxidized graphene.
• The observed trend is linked to the suppression of oxidation-induced ripples.

Conclusions:

• The Poisson's ratio of graphene oxide is highly tunable via its oxidation degree.
• Oxidation-induced ripples and their suppression play a key role in the mechanical response.
• This tunability opens possibilities for designing GO-based materials with specific mechanical characteristics.