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Geometry Scaling of Thermal Boundary Resistance in Plasmonic Nanostructures
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DOI：10.1039/D6NH00145A.png)
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Abstract
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Heat exchange between metal nanoparticles and their surrounding liquid plays a central role in thermoplasmonics; photonics; and nanoscale sensing. Yet it remains difficult to predict how particle shape influences interfacial thermal resistance. Here we introduce a geometry-driven scaling design that identifies shape as the primary determinant of interfacial resistance and demonstrates that this resistance scales linearly with the number of nanoscale heat sources within a given fluid volume. Using a reduced single-time-constant description of thermal relaxation; time-domain measurements yield volume-normalised interfacial resistances independent of the surrounding fluid pathway. When expressed through appropriate geometric normalisation; these resistances fall onto a universal scaling trend across nano stars; spheres; and rods.The resulting scaling law; Rint; vol(ANP/VNP )/RK0 plotted against the geometry factor D/L + α (hspike/rtip) unifies structures of these different shapes by linking their interfacial thermal behaviour to a single dimensionless geometry factor. This formulation shows that geometry; which is not the specific thermal or optical driving conditions sets the governing law for interfacial heat transport at the nanoscale; offering a compact design principle for engineering heat flow in a wide range of nanostructured systems.
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