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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

OPTICAL ABSORPTION OF GRAPHENE-COATED NANOPARTICLES AND GRAPHENE NANOSHELLS

Zhaolong Wang
MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China; George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA

Zhuomin M. Zhang
Institute of Engineering Thermophysics, Shanghai Jiao Tong University, Shanghai, 200240, China; George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA

Ping Cheng
Mechanical Engineering Department, The Hong Kong University of Science and Technology; MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China

DOI: 10.1615/IHTC16.nmt.023717
pages 7257-7264


KEY WORDS: graphene-coated silver nanoparticle, graphene nanoshell, optical absorption, Mie theory, equivalent dielectric permittivity model

Abstract

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.

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