In-Plane Anisotropic Faceting of Ultralarge and Thin Single-Crystalline Colloidal SnS Nanosheets
journal contributionposted on 2019-02-14, 00:00 authored by Fu Li, Mohammad Mehdi Ramin Moayed, Eugen Klein, Rostyslav Lesyuk, Christian Klinke
The colloidal synthesis of large, thin two-dimensional (2D) nanosheets is fascinating but challenging, since the growth along the lateral and vertical dimensions needs to be controlled independently. In-plane anisotropy in 2D nanosheets is attracting more attention as well. We present a new synthesis for large colloidal single-crystalline SnS nanosheets with the thicknesses down to 7 nm and lateral sizes up to 8 μm. The synthesis uses trioctylphosphine-S (TOP-S) as sulfur source and oleic acid (with or without trioctylphosphine, TOP) as ligands. Upon adjusting the capping ligand amount, the growth direction can be switched between anisotropic directions (armchair and zigzag) and isotropic directions (“ladder” directions), leading to an edge-morphology anisotropy. This is the first report on solution-phase synthesis of large thin tin(II) sulfide (SnS) nanosheets (NSs) with tunable edge faceting. Furthermore, electronic transport measurements show strong dependency on the crystallographic directions confirming structural anisotropy.
growth direction7 nmThin Single-Crystalline Colloidal SnS Nanosheets8 μ mNSanisotropic directionsTOP-Stransport measurements showIn-Plane Anisotropic Facetingligand amountoleic acid2 D nanosheetstunable edge facetingsulfur sourceedge-morphology anisotropyIn-plane anisotropysingle-crystalline SnS nanosheetssolution-phase synthesis