nl303109r_si_001.pdf (273.5 kB)
Particle-Level Engineering of Thermal Conductivity in Matrix-Embedded Semiconductor Nanocrystals
journal contribution
posted on 2012-11-14, 00:00 authored by Daniel
C. Hannah, Sandrine Ithurria, Galyna Krylova, Dmitri V. Talapin, George C. Schatz, Richard D. SchallerKnown manipulations of semiconductor thermal transport
properties
rely upon higher-order material organization. Here, using time-resolved
optical signatures of phonon transport, we demonstrate a “bottom-up”
means of controlling thermal outflow in matrix-embedded semiconductor
nanocrystals. Growth of an electronically noninteracting ZnS shell
on a CdSe core modifies thermalization times by an amount proportional
to the overall particle radius. Using this approach, we obtain changes
in effective thermal conductivity of up to 5× for a nearly constant
energy gap.