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Issue 3, 2019
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Plasmonics of Au nanoparticles in a hot thermodynamic bath

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Electromagnetically-heated metal nanoparticles can be exploited as efficient heat sources at the nanoscale. The assessment of their temperature is, however, often performed indirectly by modelling their temperature-dependent dielectric response. Direct measurements of the optical properties of metallic nanoparticles in equilibrium with a thermodynamic bath provide a calibration of their thermo-optical response, to be exploited for refining current thermoplasmonic models or whenever direct temperature assessments are practically unfeasible. We investigated the plasmonic response of supported Au nanoparticles in a thermodynamic bath from room temperature to 350 °C. A model explicitly including the temperature-dependent dielectric function of the metal and finite-size corrections to the nanoparticles’ permittivity correctly reproduced experimental data for temperatures up to 75 °C. The model accuracy gradually faded for higher temperatures. Introducing a temperature-dependent correction that effectively mimics a surface-scattering-like source of damping in the permittivity of the nanoparticles restored good agreement with the data. A finite-size thermodynamic effect such as surface premelting may be invoked to explain this effect.

Graphical abstract: Plasmonics of Au nanoparticles in a hot thermodynamic bath

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Supplementary files

Article information

08 Nov 2018
27 Nov 2018
First published
04 Dec 2018

Nanoscale, 2019,11, 1140-1146
Article type

Plasmonics of Au nanoparticles in a hot thermodynamic bath

M. Magnozzi, M. Ferrera, L. Mattera, M. Canepa and F. Bisio, Nanoscale, 2019, 11, 1140
DOI: 10.1039/C8NR09038F

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