Computational Characterization of the Recently Synthesized Pristine and Porous 12-Atom-Wide Armchair Graphene Nanoribbon

TL;DR

This study uses DFT and MD simulations to comprehensively analyze how porosity affects the electronic, optical, thermal, and mechanical properties of 12-atom-wide armchair graphene nanoribbons, revealing tunable functionalities.

Contribution

It provides the first detailed theoretical characterization of porous 12-AGNRs, demonstrating how porosity engineering can tailor their properties for various nanotechnology applications.

Findings

Porosity widens electronic band gaps and introduces localized states.

Optical absorption is significantly shifted due to excitonic effects.

Thermal conductivity decreases with increased phonon scattering at pores.

Abstract

Recently synthesized Porous 12-Atom-Wide Armchair Graphene Nanoribbons Nano Lett. 2024, 24, 10718-10723 exhibit tunable properties through periodic porosity, enabling precise control over their electronic, optical, thermal, and mechanical behavior. This work presents a comprehensive theoretical characterization of pristine and porous 12-AGNRs based on density functional theory (DFT) and molecular dynamics (MD) simulations. DFT calculations reveal substantial electronic modifications, including band gap widening and the emergence of localized states. Analyzed within the Bethe-Salpeter equation (BSE) framework, optical properties highlight strong excitonic effects and significant absorption shifts. Thermal transport simulations indicate a pronounced reduction in conductivity due to enhanced phonon scattering at nanopores. At the same time, MD-based mechanical analysis shows decreased stiffness and strength while maintaining structural integrity. Despite these modifications, porous 12-AGNRs remain mechanically and thermally stable. These findings establish porosity engineering as a powerful strategy for tailoring graphene nanoribbons' functional properties, reinforcing their potential for nanoelectronic, optoelectronic, and thermal management applications.