Simulation of Au particle interaction on graphene sheets

Mcleod, Angus, Vernon, Kristy Cherie, Rider, Amanda E., & Ostrikov, Kostya (2013) Simulation of Au particle interaction on graphene sheets. In Pribat, Didier, Lee, Young Hee, Razeghi, Manijeh, & Baik, Seunghyun (Eds.) Proceedings of SPIE : Carbon Nanotubes, Graphene, and Associated Devices VI, SPIE Digital Library, San Diego Convention Center, California, United States, 88140Z.

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The interaction of Au particles with few layer graphene is of interest for the formation of the next generation of sensing devices(1). In this paper we investigate the coupling of single gold nanoparticles to a graphene sheet, and multiple gold nanoparticles with a graphene sheet using COMSOL Multiphysics. By using these simulations we are able to determine the electric field strength and associated hot-spots for various gold nanoparticle-graphene systems. The Au nanoparticles were modelled as 8 nm diameter spheres on 1.5 nm thick (5 layers) graphene, with properties of graphene obtained from the refractive index data of Weber(2) and the Au refractive index data from Palik(3).

The field was incident along the plane of the sheet with polarisation tested for both s and p. The study showed strong localised interaction between the Au and graphene with limited spread; however the double particle case where the graphene sheet separated two Au nanoparticles showed distinct interaction between the particles and graphene. An offset was introduced (up to 4 nm) resulting in much reduced coupling between the opposed particles as the distance apart increased. Findings currently suggest that the graphene layer has limited interaction with incident fields with a single particle present whilst reducing the coupling region to a very fine area when opposing particles are involved. It is hoped that the results of this research will provide insight into graphene-plasmon interactions and spur the development of the next generation of sensing devices.

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ID Code: 65340
Item Type: Conference Paper
Refereed: Yes
Keywords: graphene, Au, Nanoparticles, Simulation, COMSOL Multiphysics, Plasmon
DOI: 10.1117/12.2022820
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 SPIE
Deposited On: 12 Dec 2013 23:37
Last Modified: 09 Sep 2016 14:20

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