Ionische Flüssigkeiten zur Synthese von Funktions-Nanomaterialien
Abstract: For the first time, ionic liquids were applied for the size-selective synthesis of thermoelectric antimony telluride (Sb2Te3) nanoplates by thermal decomposition of the single-source precursor bis(diethylstibino)telluride (Et2Sb)2Te. Herein, we report on the synthesis of Sb2Te3 nanoparticles with record-high thermoelectric figure of merit values of up to 1.5. For synthesis, Sb2Te3 nanoplates with a good thermoelectric figure of merit are prepared by using ionic liquids and the microwave technique. The three substantially important thermoelectric parameters, namely electrical conductivity, thermal conductivity and the Seebeck coefficient, were independently addressed to improve the overall performance of the material by making use of a tailor-made metal organic precursor and a specific ionic liquid as the reaction medium and particle stabilizer. The critical influence of porosity for the fabrication of highly efficient thermoelectric materials was demonstrated for the first time. Unequivocal trends could be observed for synthesis of optimal thermoelectric materials in ionic liquids is required. This knowledge simplifies the work in this area for other projects in the near future.