METHOD FOR MANUFACTURING BI_XSB_2-XTE₃ NANOCOMPOUND THERMOELECTRIC MATERIAL, AND NANOCOMPOUND THERMOELECTRIC MATERIAL MANUFACTURING THEREBY

摘要

Provided is a method for manufacturing a Bi_xSb_2-xTe₃ nanocompound thermoelectric material (0 x 2) comprising the steps of: preparing a Bi-Sb-Te solution by introducing Bi, Sb, and Te precursors into a solvent (step 1); preparing a hydrate by mixing the Bi-Sb-Te solution prepared in step 1 with a basic aqueous solution (step 2); preparing a Bi_xSb_2-xTe₃ reaction product by introducing a reducing agent to the hydrate prepared in step 2 and through a liquid phase reduction at room temperature (step 3); aging the Bi_xSb_2-xTe₃ reaction product prepared in step 3 (step 4); and preparing Bi_xSb_2-xTe₃ nanoparticles by filtering and drying the Bi_xSb_2-xTe₃ reaction product that has been aged in step 4. Bi_xSb_2-xTe₃ nanocompounds prepared by means of the liquid phase reduction step according to the present invention is capable of preventing growth of particles and forming uniform nanoparticles by not requiring additional heat treatment for removing chemical additives. As a result, the sizes of particles of the Bi_xSb_2-xTe₃ nanocompounds are between 1 and 100 nm and are evenly distributed, thereby reducing thermoelectricity conduction of the Bi_xSb_2-xTe₃ nanocompounds and ultimately improving thermoelectric figure of merit.