Study of Heat Transfer Dynamics from Gold Nanorods to the Environment via Time-Resolved Infrared Spectroscopy
Scheme of the laser pulse sequence and the heat transfer.
Revealed the dynamics of heat transfer from plasmonic gold nanorods to the local water environment using time-resolved infrared spectroscopy (TRIR).
Significance and Impact
Knowing the local heat surrounding nanoparticles is crucial to nanoscience applications, such as photothermal therapy, drug delivery, solar steam and photocatalysis.
- Studied prototypical photo-thermal systems: organic CTAB bilayer capped gold nanorods, and gold nanorods coated with varying thicknesses of inorganic mesoporous-silica in water solution.
- TRIR tracked changes in a vibrational mode of local water.
- Heat transfer of CTAB capped gold nanorods (350 ps) becomes faster with higher laser excitation power, while silica coating slows down the heat transfer.