Gold nanoparticles aggregation on graphene using Reactive force field: A molecular dynamic study

Hingies Monisha, J and Velachi, V and Maiti, PK (2023) Gold nanoparticles aggregation on graphene using Reactive force field: A molecular dynamic study. In: Journal of Chemical Physics, 159 (15).

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Abstract

We examine the aggregation behavior of AuNPs of different sizes on graphene as function of temperature using molecular dynamic simulations with Reax Force Field. In addition, the consequences of such aggregation on the morphology of AuNPs and the charge transfer behavior of AuNP-Graphene hybrid structure are analyzed. The aggregation of AuNPs on graphene is confirmed from the center of mass distance calculation. The simulation results indicate that the size of AuNPs and temperature significantly affect the aggregation behavior of AuNPs on graphene. The strain calculation showed that shape of AuNPs changes due to the aggregation and the smaller size AuNPs on graphene exhibit more shape changes than larger AuNPs at all the temperatures studies in this work. The charge transfer calculation reveals that, the magnitude of charge transfer is higher for larger AuNPs-graphene composite when compared with smaller AuNPs-graphene composite. The charge transfer trend and the trends seen in the number of Au atoms directly in touch with graphene are identical. Hence, our results conclude that, quantity of Au atoms directly in contact with graphene during aggregation is primarily facilitates charge transfer between AuNPs and graphene. Our results on the size dependent strain and charge transfer characteristics of AuNPs will aid in the development of AuNPs-graphene composites for sensor applications. © 2023 Author(s).

Item Type:	Journal Article
Publication:	Journal of Chemical Physics
Publisher:	American Institute of Physics Inc.
Additional Information:	The copyright for this article belongs to authors.
Keywords:	Charge transfer; Gold nanoparticles; Molecular dynamics, Aggregation behavior; AuNPs/graphene; Different sizes; Dynamic studies; Dynamics simulation; Gold nanoparticle; Gold Nanoparticles; Graphene composites; Nanoparticle aggregation; Reactive force field, Graphene
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	10 Dec 2024 18:23
Last Modified:	10 Dec 2024 18:23
URI:	http://eprints.iisc.ac.in/id/eprint/85394

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