We investigate suspensions of 3-10 nm diameter Au, Pt, and AuPd nanoparticles as probes of thermal transport in fluids and determine approximate values for the thermal conductance G of the particle/fluid interfaces. Subpicosecond λ = 770 nm optical pulses from a Ti:sapphire mode-locked laser are used to heat the particles and interrogate the decay of their temperature through time-resolved changes in optical absorption. The thermal decay of alkanethiol-terminated Au nanoparticles in toluene is partially obscured by other effects; we set a lower limit G >20 MW m-2 K-1. The thermal decay of citrate-stabilized Pt nanoparticles in water gives G≈130 MW m-2 K-1. AuPd alloy nanoparticles in toluene and stabilized by alkanethiol termination give G≈5 MW m-2 K-1. The measured G are within a factor of 2 of theoretical estimates based on the diffuse-mismatch model.

Original languageEnglish (US)
Article number224301
Pages (from-to)2243011-2243016
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number22
StatePublished - Dec 1 2002

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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