METHOD FOR PREPARING PHASE-SEPARATED TELLURIUM LEAD-LEAD SULFIDE NANOPOWDER USING SOLUTION SYNTHESIS AND PHASE-SEPARATED TELLURIUM LEAD-LEAD SULFIDE NANOPOWDER PREPARED THEREBY

摘要

The present invention relates to a method for preparing a phase-separated tellurium lead-lead sulfide nanopowder using solution synthesis and a phase-separated tellurium lead-lead sulfide nanopowder prepared thereby and, more specifically, to a method for preparing a phase-separated tellurium lead-lead sulfide nanopowder using solution synthesis and a phase-separated tellurium lead-lead sulfide nanopowder prepared thereby, wherein the method comprises the steps of: (a) mixing tellurium (Te) and a first solvent, followed by ultrasonic irradiation, to prepare a tellurium-mixed solution; (b) mixing a sulfur (S) organic material with a second solvent, followed by ultrasonic irradiation, to prepare a sulfur-mixed solution; (c) mixing lead oxide (PbO) with a third solvent and a fourth solvent, followed by heating; (d) adding the tellurium-mixed solution prepared in step (a) to the resultant product in step (c), followed by reaction; (e) adding the sulfur-mixed solution prepared in step (b) to the resultant product in step (d), followed by reaction; and (f) cooling the resultant product in step (e) to room temperature to obtain a phase-separated tellurium lead-lead sulfide nanopowder. According to the present invention, the nanopowder existing in a state in which the tellurium lead and the lead sulfide are phase-separated can be mass-produced at a low temperature in a short time. The present invention can be favorably used in fields of thermoelectric generation and infrared application, and can be presented as a novel method for controlling microstructures since the possibility of controlling microstructures in the nanometer unit is shown through the discovery of a spinodal phase separation phenomenon, which has difficulty in occurring thermodynamically in the temperature range of synthesis suggested in the present invention.