Li Fu, Ramin Moayed Mohammad Mehdi, Klein Eugen, Lesyuk Rostyslav, Klinke Christian
Institute of Physical Chemistry , University of Hamburg , Martin-Luther-King-Platz 6 , Hamburg 20146 , Germany.
Pidstryhach Institute for Applied Problems of Mechanics and Mathematics of NAS of Ukraine , Naukowa Str. 3b , Lviv 79060 , Ukraine.
J Phys Chem Lett. 2019 Mar 7;10(5):993-999. doi: 10.1021/acs.jpclett.9b00251. Epub 2019 Feb 19.
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.
