Fabrication method of thermoelectric materials using core-shell structured nanoparticle, and the thermoelectric materials thereby

摘要

The present invention is a core-shell (core-shell) structure manufacturing method of the thermoelectric materials using nano materials and This relates to a thermoelectric material that is manufactured in accordance with, specifically, the thermal conductive material is a coating on the surface of the core-shell (core-shell) to prepare a powder having a nano-structure (step 1); Prepared in step 1, the core-shell (core-shell) structure nano powder, bismuth (Bi) salt, tellurium (Te) salt and the step of adding a surfactant to the solvent and mixed (step 2); The step of adding and dispersing the reducing agent to the mixture of step 2 (step 3); And provides a method for producing nano-material is dispersed in the thermoelectric material comprises a step (step 4) to heat the reducing agent is added and the mixture dispersed in the above step 3. According to the present invention the core-shell (core-shell) structure manufacturing method of the thermoelectric material using nano material and thus the thermoelectric material to be produced can be easily produced according to the thermoelectric material uniformly dispersed in nano-crystal grains different thermal interior, When sintering the thermoelectric material prepared and used to screen bulk thermoelectric material can be produced to be present in a state dispersed on the nano still maintained after sintering. Thus, the lattice phonon scattering by the base material and the grain boundaries of the heat-scattering effect by the nano-dispersed phase appeared at the same time it is possible to reduce the thermal conductivity significantly, the electrical characteristics to ultimately keep the figure of merit (ZT) value for the improved thermal material can be prepared. ;