PRODUCTION METHOD FOR NANOCOMPOSITE THERMOELECTRIC CONVERSION MATERIAL

摘要

A nanocomposite thermoelectric conversion material capable of improving enhancement of ZT by reducing the thermal conductivity is provided by a production method for a nanocomposite thermoelectric conversion material composed of a matrix and a nanoparticle, the method comprising selecting the combination of at least three kinds of elements such that out of, one kind of an element becomes an oxide in the form of a nanoparticle; dissolving the elements such that the amount of the element constituting the nanoparticle becomes excessive with respect to the composition of the matrix in the final target product; adding a reducing agent to the solution, thereby allowing a reduction reaction to proceed at a plurality of different pH values from the initiation to the termination of reaction; and performing a hydrothermal treatment to cause formation of the matrix by alloying and formation of a nanoparticle composed of the oxide.