Phase transformation and thermoelectric properties of bismuth-telluride nanowires

Abstract

Thermoelectric materials have attracted much attention due to the current interest in energy conversion and recent advancements in nano-engineering. A simple approach to synthesize BiTe and Bi₂Te₃ micro/nanowires was developed by combining solution chemistry reactions and catalyst-free vapor–solid growth. A pathway to transform the as-grown BiTe nanostructures into Bi₂Te₃ can be identified through the Bi–Te phase diagram. Structural characterization of these products was identified using standard microscopy practices. Meanwhile, thermoelectric properties of individual Bi–Te compound micro/nanowires were determined by the suspended microdevice technique. This approach provides an applicable route to synthesize advanced high performance thermoelectric materials in quantities and can be used for a wide range of low-dimensional structures.