Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

OPTICAL ABSORPTION OF GRAPHENE-COATED NANOPARTICLES AND GRAPHENE NANOSHELLS

Get access (open in a dialog) DOI: 10.1615/IHTC16.nmt.023717
pages 7257-7264

Abstrakt

The optical absorption of a silver nanoparticle coated by a single-layer of graphene sheet and that of a graphene nanoshell are studied numerically based on an extended Mie theory. In this study, the radius of the nanoparticle or nanoshell is chosen to be 50 nm, which is a typical size of nanoparticles. It is found that that the absorption efficiency factor of silver nanoparticles can only be slightly enhanced by the graphene layer in the wavelength range of 300-1000 nm, without affecting the plasmon resonance frequency that lies in the ultraviolet and visible region. On the other hand, there is a plasmon resonance in the mid-infrared with a graphene nanoshell, whose resonance peak and location depend on the dielectric function of graphene, which is modeled based on an equivalent permittivity model. The absorption efficiency factor of the graphene-coated silver nanoparticle is weakly dependent on the dielectric function of graphene. However, the absorption efficiency factor of graphene nanoshells is greatly influenced by the relaxation time and chemical potential of graphene.