Thermal and Thermoelectric Transport in Highly Resistive Single Sb₂Se₃ Nanowires and Nanowire Bundles.

ABSTRACT: In this study, we measured the thermal conductivity and Seebeck coefficient of single Sb₂Se₃ nanowires and nanowire bundles with a high resistivity (? ~ 4.37?×?10^-4 S/m). Microdevices consisting of two adjacent suspended silicon nitride membranes were fabricated to measure the thermal transport properties of the nanowires in vacuum. Single Sb₂Se₃ nanowires with different diameters and nanowire bundles were carefully placed on the device to bridge the two membranes. The relationship of temperature difference on each heating/sensing suspension membranes with joule heating was accurately determined. A single Sb₂Se₃ nanowire with a diameter of ~ 680?nm was found to have a thermal conductivity (k_NW) of 0.037?±?0.002?W/m·K. The thermal conductivity of the nanowires is more than an order of magnitude lower than that of bulk materials (k ~ 0.36-1.9?W/m·K) and highly conductive (? ~ 3?×?10⁴ S/m) Sb₂Se₃ single nanowires (k ~ 1?W/m·K). The measured Seebeck coefficient with a positive value of ~ 661??V/K is comparable to that of highly conductive Sb₂Se₃ single nanowires (~ 750??V/K). The thermal transport between wires with different diameters and nanowire bundles was compared and discussed.

SUBMITTER: Ko TY 

PROVIDER: S-EPMC5054389 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature