Molecularly protected bismuth telluride nanoparticles: Microemulsion synthesis and thermoelectric transport properties

A room-temperature microemulsion synthesis of molecularly capped bismuth telluride nanoparticles with small (average ca. 2.5 mn) diameters is reported (see figure). The use of thioglycolic acid ligands inhibits nanoparticle agglomeration and surface oxidation. Annealing the nanoparticle films to 350 degrees C yields a Seebeck coefficient of - 107 mu K-1. The findings are attractive for realizing of high figure of merit thermoelectric materials via nanostructuring control over surface chemistry.