Issue 10, 2011

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

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 Td 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.

Graphical abstract: Colloidal synthesis of metastable zinc-blende IV–VI SnS nanocrystals with tunable sizes

Supplementary files

Article information

Article type
Paper
Submitted
14 Jul 2011
Accepted
12 Aug 2011
First published
14 Sep 2011

Nanoscale, 2011,3, 4346-4351

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

Z. Deng, D. Han and Y. Liu, Nanoscale, 2011, 3, 4346 DOI: 10.1039/C1NR10815H

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