Carbon-based nanostructured composite films: elastic, mechanical and optoelectronic properties derived from computer simulations

TL;DR

This review summarizes recent computational studies on carbon-based nanostructured composites, highlighting their elastic, mechanical, and optoelectronic properties, stability, and potential for nanotechnological applications such as ultra-hard coatings.

Contribution

The paper provides a comprehensive computational analysis of carbon nanostructured composites, including their stability, elastic behavior, fracture, and electronic properties, emphasizing diamond composites.

Findings

Diamond composites are the most stable among studied materials.

These composites exhibit high elastic moduli and anisotropy.

Electronic and optical properties are linked to structural disorder.

Abstract

In this review, we present our recent computational work on carbon-based nanostructured composites. These materials consist of carbon crystallites embedded in an amorphous carbon matrix and are modeled here through classical and semi-empirical quantum-mechanical simulations. We investigate the energetics, mechano-elastic, and optoelectronic properties of these materials. Once the stability of the composites is discussed, we move on to the calculation of their elastic moduli and constants, their anisotropy and elastic recovery. At a next step, we focus on diamond composites, which were found to be the most stable among the composites studied, and went beyond the elastic regime to investigate their ideal fracture. Finally, for these materials, the electronic density of states, dielectric function, and optical response were calculated and linked to the disorder in the structures. Our findings unveil the high potential of these materials in nanotechnological applications, especially as ultlra-hard coatings.