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1.
J Am Chem Soc ; 136(44): 15465-8, 2014 Nov 05.
Artículo en Inglés | MEDLINE | ID: mdl-25333207

RESUMEN

We describe a general approach for the synthesis of micro-/nanostructured metal chalcogenides from elemental precursors. The excellent solubility of sulfur, selenium, and tellurium in phosphonium ionic liquids promotes fast reactions between chalcogens and various metal powders upon microwave heating, giving crystalline products. This approach is green, universal, and scalable.

2.
Adv Mater ; 26(17): 2755-61, 2618, 2014 May.
Artículo en Inglés | MEDLINE | ID: mdl-24474071

RESUMEN

An approach based on a solution-based synthesis that produces a thermally stable Ag/oxide/S2 Te3 -Te metal-semiconductor heterostructure is described. With this approach, a figure of merit of zT = 1.0 at 460 K is achieved, a record for a heterostructured material made using wet chemistry. Combining experiments and theory shows that the large increase in the material's Seebeck coefficient results from hot carrier filtering.

4.
Nano Lett ; 12(2): 1075-80, 2012 Feb 08.
Artículo en Inglés | MEDLINE | ID: mdl-22236089

RESUMEN

In this work, Ag(x)Te(y)-Sb(2)Te(3) heterostructured films are prepared by ligand exchange using hydrazine soluble metal chalcogenide. Because of the created interfacial barrier, cold carriers are more strongly scattered than hot ones and thereby an over 50% enhanced thermoelectric power factor (~2 µW/(cm·K(2))) is obtained at 150 °C. This shows the possibility of engineering multiphases to further improve thermoelectric performance beyond phonon scattering through a low-temperature solution processed route.


Asunto(s)
Antimonio/química , Membranas Artificiales , Nanopartículas del Metal/química , Plata/química , Telurio/química , Temperatura , Electricidad , Tamaño de la Partícula , Propiedades de Superficie
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