Abstract
In this work, Bi2Te3 nanoflowers were successfully synthesized through hydrothermal method. The effect of reaction time on crystal growth and the morphological evolution of these nanoflowers were studied in detail. The obtained nanopowders were characterized by employing XRD, FESEM, EDAX, HRTEM, and Raman studies. The XRD results shows that rhombohedral Bi2Te3 is obtained, without any impurities, at a reaction time of 8, 24, and 36 hours. But along with Bi2Te3, elemental Te is obtained at a reaction time of 4 hours. A growth mechanism for the evolution of nanoflowers from primary nanoplates is proposed, based on the experimental results. The HRTEM images shows that an imperfect orient attachment of primary nano plates leads to the twisting and bending of nanoplates, resulting in well-formed nanoflowers. Lattice imperfections, including twinning boundaries, incoherent boundaries, and stacking faults, will reduce thermal conductivity and improve thermoelectric conversion efficiency of the material.
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