期刊
ACS NANO
卷 4, 期 9, 页码 5055-5060出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn101322p
关键词
chalcogenide nanostructures; heterostructures; interfaces; Seebeck coefficient; thermoelectrics
类别
资金
- IBM
- NRI-NIST through the Index Center at the University at Albany
- DOE office of Basic Energy Sciences, NSF [DMR 0519081]
- New York State Foundation for Science, Technology and Innovation (NYSTAR)
Chalcogenide nanostructures offer promise for obtaining nanomaterials with high electrical conductivity, low thermal conductivity, and high Seebeck coefficient. Here, we demonstrate a new approach of tuning the Seebeck coefficient of nanoplate assemblies of single-crystal pnictogen chalcogenides by heterostructuring the nanoplates with tellurium nanocrystals. We synthesized bismuth telluride and antimony telluride nanoplates decorated with tellurium nanorods and nanofins using a rapid, scalable, microwave-stimulated organic surfactant-directed technique. Heterostructuring permits two- to three-fold factorial tuning of the Seebeck coefficient, and yields a 40% higher value than the highest reported for bulk antimony telluride. Microscopy and spectroscopy analyses of the nanostructures suggest that Seebeck tunability arises from carrier-energy filtration effects at the Te-chalcogenide heterointerfaces. Our approach of heterostructuring nanoscale building blocks is attractive for realizing high figure-of-merit thermoelectric nanomaterials.
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