Time-dependent density-functional study of hydrogen adsorption and scattering on graphene surfaces

TL;DR

This study uses time-dependent density-functional theory to analyze how incident point and kinetic energy affect hydrogen atom interactions with graphene, impacting adsorption, scattering, and vibrational dynamics.

Contribution

It introduces a detailed simulation approach to understand how initial parameters influence hydrogen-graphene interactions, highlighting the importance of incident point and energy.

Findings

Incident point affects post-interaction energy and scattering angles.

Non-collision incident points lead to longer interactions and higher adsorption likelihood.

Initial kinetic energy determines whether hydrogen is adsorbed, scattered, or transmitted.

Abstract

Time-dependent density-functional theory simulations are performed to examine the effects of varying incident points and kinetic energies of hydrogen atom projectiles on a graphene-like structure. The simulations reveal that the incident point significantly influences the hydrogen atom's kinetic energy post-interaction, the vibrational dynamics of the graphene lattice, and the scattering angles. Incident points that do not directly collide with carbon atoms result in prolonged interaction times and reduced energy transfer, increasing the likelihood of overcoming the graphene's potential energy barrier and hydrogen atom adsorption. The study also explores the role of initial kinetic energy in determining adsorption, scattering, or transmission outcomes. These results emphasize the critical influence of initial parameters on the hydrogenation process and provide a foundation for future experimental validation and further exploration of hydrogen-graphene interactions.