, Volume 14, Issue 1, pp 263–270 | Cite as

Effective Dielectric Constant of Plasmonic Nanofluid Containing Core-Shell Nanoparticles

  • Ding Li
  • Jiayu LiEmail author


This paper focuses on the effective dielectric constant of water-based plasmonic nanofluid containing SiO2/Ag core/shell nanoparticles (NPs). Two effective models, based on S-parameter retrieval method and Maxwell-Garnett effective medium theory, are employed. The effective dielectric constants predicted by the two effective models are compared and the applicability is evaluated by comparing the reflectance and absorptance. Three influence factors, including volume fraction, core-shell ratio, and size of NPs, are considered. Results show both of the two effective models can predict reliable effective dielectric constants when the volume fraction, size, and core-shell ratio of nanoparticles are 5%, 25 nm, and 4:1 respectively. Only small deviations appear in the resonant region under this condition. With the increase of volume fraction, shell proportion, or size, deviations in the resonant region become larger for both of the two effective models. Therefore, the predicted effective dielectric constants are not suitable for the prediction of optical properties, because the resonant region is the key region of the solar conversion for plasmonic nanofluids. Hence, the parameters of NPs need to be changed to make the effective models applicable. Moreover, the effective model based on S-parameter retrieval can predict more reliable dielectric constant than the effective model based on Maxwell-Garnett theory.


Effective dielectric constant Core-shell nanoparticles Plasmonic nanofluids S-parameter retrieval Maxwell-Garnett theory 



We thank Stéphane Larouche for his help in the modification of S-parameters.

Funding information

This work was supported by the National Natural Science Foundation of China (Grant No.51476078).


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjingChina

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