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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.

Scientific Achievement
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.

Research Details

  • 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.

SC Nguyen, Q. Zhang, K. Manthiram, X. Ye, J.P. Lomont, C.B. Harris, H. Weller, A.P. Alivisatos, ACS Nano 10 (2), pp 2144-2151 (2016) DOI: 10.1021/acsnano.5b06623