Issue 5, 2018

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

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

Supplementary files

Article information

Article type
Paper
Submitted
10 Nov 2017
Accepted
09 Jan 2018
First published
10 Jan 2018

Nanoscale, 2018,10, 2533-2541

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, 10, 2533 DOI: 10.1039/C7NR08387D

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