Journal
NANO LETTERS
Volume 10, Issue 11, Pages 4417-4422Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl1020848
Keywords
Nanowires; nanotubes; antimony selenide; electrical conductivity; sulfur
Categories
Funding
- NRI-NIST through the Index Center at the University at Albany
- DOE office of Basic Energy Sciences
- NSF [DMR 0519081, CBET 0348613]
- New York State Foundation for Science, Technology, and Innovation
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Antimony selenide is a promising thermoelectric material with a high Seebeck coefficient, but its figure of merit is limited by its low electrical conductivity. Here, we report a rapid and scalable (gram-a-minute) microwave synthesis of one-dimensional nanocrystals of sulfurized antimony selenide that exhibit similar to 10(4)-10(10) times higher electrical conductivity than non-nanostructured bulk or thin film forms of this material. As the nanocrystal diameter increases, the nanowires transform into nanotubes through void formation and coalescence driven by axial rejection of sulfur incorporated into the nanowires from the surfactant used in our synthesis. Individual nanowires and nanotubes exhibit a charge carrier transport activation-energy of similar to <60 meV arising from surface sulfur donor states. Nanocrystal assemblies also show high electrical conductivity, making the nanocrystals attractive building blocks to realize nanostructured thin film and bulk forms of this material for thermoelectric device applications.
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