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Colloidal synthesis of metastable zinc-blende IV-VI SnS nanocrystals with tunable sizes.

Nanoscale (2011-09-15)
Zhengtao Deng, Dongran Han, Yan Liu
ABSTRACT

Here we report the colloidal synthesis of size-tunable SnS nanocrystals that have an unusual meta-stable cubic zinc-blende phase instead of the more stable layered orthorhombic phase. The single-crystalline zinc-blende SnS nanocrystals with sizes of 8 nm, 60 nm, and 700 nm were achieved by injecting the sulfur-oleylamine precursor into tin-oleylamine solution in the presence of hexamethyldisilazane (HMDS) at different temperatures. The morphology and structure of the SnS nanocrystals were studied by high-resolution electron microscopy techniques. The small SnS nanoparticles (∼8 nm and ∼60 nm) are nearly spherical and have the polyhedral shape. The large (∼700 nm) crystals display a unique crystal morphology that have T(d) symmetry with a truncated tetrahedron configuration, and the four truncated surfaces each outgrow to form a convex triangular pyramid corner. Careful structural analysis revealed that each of the crystal is enclosed by 4 low-index {111} hexangular facets and 12 high-index {220} triangular facets using a lift-out technique with a focused ion beam (FIB) and followed by high resolution electron microscope imaging. The direct band gaps of the different sized SnS nanocrystals range from 1.63 eV to 1.68 eV. These heavy-metal-free and low cost nanocrystals are highly efficient absorptive materials in the whole UV-visible range, suitable for applications in photovoltaic cells.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Oleylamine, technical grade, 70%
Sigma-Aldrich
Lithium bis(trimethylsilyl)amide solution, 1.0 M in THF
Sigma-Aldrich
Hexamethyldisilazane, reagent grade, ≥99%
Sigma-Aldrich
Sodium bis(trimethylsilyl)amide solution, 1.0 M in THF
Sigma-Aldrich
Potassium bis(trimethylsilyl)amide solution, 1 M in THF
Sigma-Aldrich
Lithium bis(trimethylsilyl)amide, 97%
Sigma-Aldrich
Hexamethyldisilazane, ReagentPlus®, 99.9%
Sigma-Aldrich
Potassium bis(trimethylsilyl)amide, 95%
Sigma-Aldrich
Potassium bis(trimethylsilyl)amide solution, 0.5 M in toluene
Supelco
Hexamethyldisilazane, for GC derivatization, LiChropur, ≥99.0% (GC)
Sigma-Aldrich
Lithium bis(trimethylsilyl)amide solution, 1 M in toluene
Sigma-Aldrich
Sodium bis(trimethylsilyl)amide, 95%
Sigma-Aldrich
Lithium bis(trimethylsilyl)amide solution, 1.5 M in THF
Sigma-Aldrich
Lithium bis(trimethylsilyl)amide solution, 1.0 M in hexanes
Sigma-Aldrich
Sodium bis(trimethylsilyl)amide solution, produced by Wacker Chemie AG, Burghausen, Germany, 40% in THF
Sigma-Aldrich
Sodium bis(trimethylsilyl)amide solution, 0.6 M in toluene
Sigma-Aldrich
Hexamethyldisilazane, produced by Wacker Chemie AG, Burghausen, Germany, ≥97.0% (GC)
Sigma-Aldrich
Tin(II) sulfide, 96%
Sigma-Aldrich
Tin(II) sulfide, granular, ≥99.99% trace metals basis
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Tris[N,N-bis(trimethylsilyl)amide]yttrium
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Tris[N,N-Bis(trimethylsilyl)amide]gadolinium(III), 98%
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Lithium bis(trimethylsilyl)amide solution, 1 M in tert-butyl methyl ether
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Tris[N,N-bis(trimethylsilyl)amide]samarium(III), 98%
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Tris[N,N-bis(trimethylsilyl)amide]europium(III), 98%
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Lithium bis(trimethylsilyl)amide solution, 0.5 M in 2-methyltetrahydrofuran
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Potassium bis(trimethylsilyl)amide solution, 1.0 M in 2-methyltetrahydrofuran
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Potassium bis(trimethylsilyl)amide solution, 1.0 M in methyl tert-butyl ether
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Sodium bis(trimethylsilyl)amide solution, 0.5 M in methyl tert-butyl ether
Sigma-Aldrich
Lithium bis(trimethylsilyl)amide solution, 0.5 M in toluene
Sigma-Aldrich
Tris[N,N-bis(trimethylsilyl)amide]yttrium, packaged for use in deposition systems