期刊
OPTICS AND LASER TECHNOLOGY
卷 146, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2021.107565
关键词
Solar energy; Bimetallic nanoparticles; Localized surface plasmon resonance; Energy decay pathways; Core-shell nanostructures
资金
- National Natural Science Foundation of China [52106195]
- Planning Project for the 13th Five-Year Plan on Scientific and Technological Research of the Educational Department of Jilin Province [JJKH20200106KJ]
This study calculated the absorption, scattering, and extinction decay channels of bimetallic core-shell nanostructures using the finite difference time domain method, and separated the energy absorbed in the core and shell to better understand the decay pathways of LSPR excited energy. Results showed that fast inter band electron transitions in shell metals are crucial for dissipating the surface electric field energy of nanoparticles efficiently. The larger imaginary part of the permittivity value of the metal shell was essential for accelerating the decay channel via the surface of the nanoparticle.
Exploring the energy transfer mechanisms and understanding the localized surface plasmon resonance (LSPR) decay pathways of plasmas are of great importance for realizing effective composition adjustment and optimization of these novel solar energy materials. In this work, the absorption, scattering, and extinction decay channels of bimetallic core-shell nanostructures were calculated using the finite difference time domain method. Moreover, we separated the energy absorbed in the core and shell of the bimetallic nanoparticles to get a better understanding of the decay pathways of LSPR excited energy. Results indicated that the availability of fast inter band electron transitions in shell metals is the way to preferentially dissipate the surface electric field energy of nanoparticles. It was supported in essence that the larger imaginary part of the permittivity value of the metal shell is crucial for accelerating the decay channel via the surface of the nanoparticle. This work provided a basic physical framework and transparent design principles for material selection of multifunctional LSPR nano particles in practical applications.
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