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Plasmonics of Au nanoparticles in a hot thermodynamic bath

Abstract

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 a good agreement with the data. A finite-size thermodynamic effect such as surface premelting may be invoked to explain this effect.

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Publication details

The article was accepted on 27 Nov 2018 and first published on 04 Dec 2018


Article type: Paper
DOI: 10.1039/C8NR09038F
Citation: Nanoscale, 2018, Accepted Manuscript
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    Plasmonics of Au nanoparticles in a hot thermodynamic bath

    M. Magnozzi, M. Ferrera, L. Mattera, M. Canepa and F. Bisio, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR09038F

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