Abstract
Uncovering the reason for structure-dependent thermoelectric performance still remains a big challenge. A low-temperature and easily scalable strategy for synthesizing Bi2 Te3 nanostring hierarchical structures through solution-phase reactions, during which there is the conversion of "homo-hetero-homo" in Bi2 Te3 heteroepitaxial growth, is reported. Bi2 Te3 nanostrings are obtained through the transformation from pure Bi2 Te3 hexagonal nanosheets followed by TeBi2 Te3 "nanotop" heterostructures to Bi2 Te3 nanostrings. The growth of Bi2 Te3 nanostrings appears to be a self-assembly process through a wavy competition process generated from Te and Bi(3+) . The conversion of homo-hetero-homo opens up new platforms to investigate the wet chemistry of Bi2 Te3 nanomaterials. Furthermore, to study the effect of morphologies and hetero/homo structures, especially with the same origin and uniform conditions on their thermoelectric properties, the thermoelectric properties of Bi2 Te3 nanostrings and TeBi2 Te3 heterostructured pellets fabricated by spark plasma sintering have been investigated separately.
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