We report thermal conductivity measurements of individual single crystalline Bi2Se3 nano-ribbon (NR) synthesized via the gold nanoparticle catalyzed vapor-liquid-solid mechanism. By using the four-probe third harmonic method, thermal conductivity of Bi2Se3 NRs was obtained in the temperature range of 10 K to 300 K. It is found that the measured thermal conductivities are nearly two orders of magnitude smaller than the bulk value and have a maximum thermal conductivity at temperature (around 200 K) greater than the bulk. The significant reduced thermal conductivity of NRs is attributed to enhanced phonon boundary scattering in nanostructured material.
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