Photothermal Response of Single Gold Nanospheres: An in-situ Characterization

MARIANO BARELLA; MARTÍNEZ, LUCIANA; PALLAROLA, DIEGO; SCHLÜCKER, SEBASTIAN; FERNANDO STEFANI; GARGIULO, JULIAN; GUGLIELMOTTI, VICTORIA; ACUNA, GUILLERMO; MAIER, STEFAN A.; IANINA L. VIOLI; GOSCHIN, FLORIAN; PILO-PAIS, MAURICIO; CORTES, EMILIANO

evento online

Jornada; LatinXchem; 2020

https://www.latinxchem.org/

Plasmonics nanoparticles (PNPs) are widely used as nanoscale heat sources. However, accurate determination of their surface temperature in operando conditions is a challenging task. Several fields of applications such as plasmon-assisted catalysis [1], optical trapping [2], thermal management of nanoscale electronics [3] or photothermal therapy motivates the development of a reliable, robust and non-invasive method able to estimate the temperature of nanostructures.In recent years, several authors have addressed this problem using different strategies. Some of them use the temperature dependence of environmental variables such as dielectric functions and refractive index to carry out simulations and fit the scattering spectra of gold nanospheres [4]. Recently, a new thermometry based on the Anti-Stokes photoluminescence emission of PNPs was introduced [5]. This enables label-free temperature measurements in operando conditions [6].In the present work, we introduce a method that allows the thermal characterization of individual PNPs in one shot (i.e., in a single photoluminescence hyper-spectral image). The method was then applied to measure the photothermal coefficient of gold nanospheres of several sizes supported on glass, sapphire and graphene substrates. These results paves the way for quantitative and controlled heat release at the nanoscale.