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Controllable colloidal synthesis of anisotropic tin dichalcogenide nanocrystals for thin film thermoelectrics

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Abstract

Tin chalcogenides have shown promise in applications including energy storage, optoelectronics, photovoltaics, and thermoelectrics. Here, we present a colloidal synthesis strategy to produce tin dichalcogenide nanocrystals (NCs) with controllable stoichiometry, vacancies, shape, and crystal structure. Compared with previously reported methods, we use less expensive precursors, such as tin(IV) chloride and sulfur or selenium powder, to produce tin(IV) chalcogenide NCs. SnS2 and SnSe2 NCs with novel NC morphologies including SnS2 nanoflowers/nanoflakes, SnSe2 nanosheets with circular and hexagonal shapes, as well as mixtures of nanospheres and nanoflakes were prepared by varying the solvents and anion precursors. We were also able to reduce tin(IV) to tin(II) to produce tin(II) chalcogenide NCs. The corresponding thin films were prepared by spin-coating, followed by post-treatment to study their thermoelectric properties. Room temperature Seebeck coefficients of −150 μV K−1 and −126 μV K−1 were measured for SnS2 and SnSe2 films, demonstrating their promise as thin film thermoelectric materials.

Graphical abstract: Controllable colloidal synthesis of anisotropic tin dichalcogenide nanocrystals for thin film thermoelectrics

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Publication details

The article was received on 10 Nov 2017, accepted on 09 Jan 2018 and first published on 10 Jan 2018


Article type: Paper
DOI: 10.1039/C7NR08387D
Citation: Nanoscale, 2018, Advance Article
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    Controllable colloidal synthesis of anisotropic tin dichalcogenide nanocrystals for thin film thermoelectrics

    D. Yin, Y. Liu, C. Dun, D. L. Carroll and M. T. Swihart, Nanoscale, 2018, Advance Article , DOI: 10.1039/C7NR08387D

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