Ultrafast laser studies of the photothermal properties of gold nanocages

Min Hu, Hristina Petrova, Jingyi Chen, Joseph M. McLellan, Andrew R. Siekkinen, Manuel Marquez, Xingde Li, Younan Xia, Gregory V. Hartland

Research output: Contribution to journalArticlepeer-review

92 Scopus citations


Au nanocages were synthesized via a galvanic replacement reaction. The extinction peak of these hollow structured particles is shifted into the near-IR compared with the Ag nanocube templates. Energy transfer ' from the Au nanocages into the surrounding environment (water) as well as the coherently excited vibrational modes of the nanocages were studied by femtosecond pump-probe spectroscopy. The time scale for energy relaxation was found to increase with the size of the particles, with the relaxation time being independent of the laser intensity. The time scales for relaxation are comparable to those for solid spherical gold particles and are consistent with energy relaxation being controlled by heat dissipation in the solvent. The period of the coherently excited vibrational mode is proportional to the dimensions of the nanocages. Intensity-dependent measurements show that in solution the nanocages maintain their integrity up to lattice temperatures of 1100 ± 100 K.

Original languageEnglish (US)
Pages (from-to)1520-1524
Number of pages5
JournalJournal of Physical Chemistry B
Issue number4
StatePublished - Feb 2 2006
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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