title: New ways to synthesize lead sulfide nanosheets-substituted alkanes direct the growth of 2D nanostructures.
abstract: Two-dimensional colloidal nanosheets represent very attractive optoelectronic materials. They combine good lateral conductivity with solution-processability and geometry-tunable electronic properties. In the case of PbS nanosheets, so far synthesis has been driven by the addition of chloroalkanes as coligands. Here, we demonstrate how to synthesize two-dimensional lead sulfide nanostructures using other halogen alkanes and primary amines. Further, we show that at a reaction temperature of 170 °C a coligand is not even necessary and the only ligand, oleic acid, controls the anisotropic growth of the two-dimensional structures. Also, using thiourea as a sulfide source, nanosheets with lateral dimensions of over 10 μm are possible.
authors.affiliation: Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Bielewicz
authors.forename: Eugen
authors.initials: E
authors.lastname: Klein
authors.forename: Christian
authors.initials: C
authors.lastname: Klinke