Metallic nanoparticles can be used as nanoheaters; they are very efficient converters of light energy into heat. However, accurate measurement of the temperatures reached by a metallic nanoparticle under illumination remains an open challenge, creating difficulties in the interpretation of results across plasmonic applications.
Particularly, there is a quest for understanding the role of temperature in plasmon-assisted catalysis. In our latest publication in Nature Communications, we applied a method recently developed in our lab (anti-Stokes nanothermometry) to measure the conversion of light into heat to compare the photothermal performance of bimetallic nanoparticles made of a gold core and a palladium coatings. We investigate the link between morphology and light-to-heat conversion of colloidal Au/Pd nanoparticles with two different configurations: core–shell and core-satellite. It is observed that the inclusion of Pd as a shell strongly reduces the photothermal response in comparison to the bare cores, while the inclusion of Pd as satellites keeps photothermal properties almost unaffected. These results contribute to a better understanding of energy conversion processes in plasmon-assisted catalysis.
This an investigation done in collaboration with the groups of Prof. Stefan Maier and Prof. Emiliano Cortés at the LMU Munich, and the group of Prof. Sebastian Schlücker from the University of Duisburg-Essen.
Read the full article:
Julian Gargiulo, Matias Herran, Ianina L. Violi, Ana Sousa-Castillo, Luciana P. Martinez, Simone Ezendam, Mariano Barella, Helene Giesler, Roland Grzeschik, Sebastian Schlücker, Stefan A. Maier, Fernando D. Stefani, Emiliano Cortes
“Impact of bimetallic interface design on heat generation in plasmonic Au/Pd nanostructures studied by single-particle thermometry”
Nature Communications 14 (2023) 3813
More about the anti-Stokes nanothermometry of single nanoparticles:
Mariano Barella, Ianina L. Violi, Julian Gargiulo, Luciana P. Martinez, Florian Goschin, Victoria Guglielmotti, Diego Pallarola, Sebastian Schlücker, Mauricio Pilo-Pais, Guillermo P. Acuna, Stefan A. Maier, Emiliano Cortes, Fernando D. Stefani
