Monitoring the Photothermal Reshaping of Individual Plasmonic Nanorods with Coherent Mechanical Oscillations

Light absorption in gold nanoparticles leads to metal heating that induces photothermal reshaping because of atomic surface diffusion at temperatures well below the gold melting point. In this work, we perform time-resolved experiments to measure the frequencies of the extensional coherent mechanica...

Full description

Saved in:
Bibliographic Details
Published inJournal of physical chemistry. C Vol. 122; no. 51; pp. 29598 - 29606
Main Authors Della Picca, Fabricio, Gutiérrez, Marina V, Bragas, Andrea V, Scarpettini, Alberto F
Format Journal Article
LanguageEnglish
Published American Chemical Society 27.12.2018
Online AccessGet full text

Cover

More Information
Summary:Light absorption in gold nanoparticles leads to metal heating that induces photothermal reshaping because of atomic surface diffusion at temperatures well below the gold melting point. In this work, we perform time-resolved experiments to measure the frequencies of the extensional coherent mechanical mode in single gold nanorods, as a monitor of the changes in their aspect ratio produced by this photoinduced reshaping. We show that photothermal reshaping always occurs in typical pump–probe experiments conducted in air even at low-excitation light irradiance and usually long measuring times. The reshaping effect can be reduced by a polymer coating, which allows faster heat dissipation from the nanoparticle to the environment.
ISSN:1932-7447
1932-7455
DOI:10.1021/acs.jpcc.8b09458