Radiative Heat Transfer Between Core-Shell Nanoparticles

TL;DR

This paper investigates how core-shell nanoparticle configurations influence radiative heat transfer, revealing that material choices and geometrical parameters can significantly enhance or suppress thermal conductance.

Contribution

It provides a detailed analysis of electric and magnetic dipole contributions to heat transfer in core-shell nanoparticles, highlighting the potential for tunable thermal conductance.

Findings

Heat transfer can be enhanced by several orders of magnitude in Au@SiO2 dimers.

Heat transfer can be reduced significantly in SiO2@Au core-shell nanoparticles.

Material and size adjustments enable control over radiative heat transfer.

Abstract

Radiative heat transfer in systems with core-shell nanoparticles may exhibit not only a combination of disparate physical properties of its components but also further enhanced properties that arise from the synergistic properties of the core and shell components. We study the thermal conductance between two core-shell nanoparticles (CSNPs). The contribution of electric and magnetic dipole moments to the thermal conductance depend sensitively on the core and shell materials, and adjustable by core size and shell thickness. We predict that the radiative heat transfer in a dimer of Au@SiO2 CSNPs (i.e., silica-coated gold nanoparticles) could be enhanced several order of magnitude compared to bare Au nanoparticles. However, the reduction of several orders of magnitude in the heat transfer is possible between SiO2@Au CSNPs (i.e., silica as a core and gold as a shell) than that of uncoated SiO2 nanoparticles.