Comparison of thermal conductivity in nanodot nanocomposites and nanograined nanocomposites

Chanyoung Kang; Hyoungjoon Kim; Sung-Geun Park; Woochul Kim
May 2010
Applied Physics Letters;5/24/2010, Vol. 96 Issue 21, p213114
Academic Journal
Most recent increases in thermoelectric performance have come by reducing thermal conductivity through nanostructuring. Therefore, current research efforts focus mainly on bulk nanocomposites. We simulated the thermal conductivities of two types of nanocomposites. We nanostructured Tl0.02Pb0.98Te by (i) embedding InSb nanodots in it, creating a nanodot nanocomposite, and (ii) polycrystallizing it, creating a nanograined nanocomposite. The nanograined nanocomposite achieved lower thermal conductivity than did the nanodot nanocomposite due to the ability of the nanosized grains in nanograined nanocomposites to effectively scatter phonons over a wide range of frequencies, as long as the nanograined nanocomposite has sufficiently small grain size.


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