Electromagnetic Response of Core-Satellite Nanoparticles for Application in Photothermal Conversion

• Published in: Plasmonics (Norwell, Mass.) Vol. 18; no. 2; pp. 661 - 676
• Main Authors: Song, Xiangtian, Li, Jiayu
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.04.2023; Springer Nature B.V
• Subjects: Absorption; Biochemistry; Biological and Medical Physics; Biophysics; Biotechnology; Boundary conditions; Chemistry; Chemistry and Materials Science; Finite element method; Nanofluids; Nanoparticles; Nanotechnology; Photothermal conversion; Solar collectors; Solar radiation; Thickness; Direct absorption solar collector; Photothermal conversion; Nanofluids; Core-satellite nanoparticle
• ISSN: 1557-1955; 1557-1963
• DOI: 10.1007/s11468-023-01787-z

In this paper, the model for the electromagnetic response of core-satellite nanoparticles is constructed based on finite element method; the quantum corrections are considered for small-sized satellite nanoparticles by introducing Feibelman d parameters in the boundary conditions of electromagnetic theory. Then, the influences of material, size, and structure on the radiant absorption of core-satellite nanoparticles is simulated by the model. The results indicate that the plasmonic coupling between nanoparticles leads to a tunable red-shifted absorption peak with a broadened absorption range, which is primarily controlled by the size of satellite nanoparticles. Based on the analysis of single nanoparticle, the temperature rise and photothermal conversion efficiency of direct absorption solar collectors (DASC) using Au nanofluid and Au/Au core-satellite nanofluid are compared under different conditions. The Au/Au nanofluid with a thickness of 2.0 cm and a volume fraction of 0.005% can capture 97.7% of the solar radiation energy in the wavelength range of 300–1200 nm. The efficiency of solar collectors can reach 76.9% under the same conditions, an increase of nearly 15% compared to which based on Au nanofluids. This work provides a feasibility investigation for the application of core-satellite nanoparticles in photothermal conversion.