Scalable large nanosheets of transition metal disulphides through exfoliation of amine intercalated MS2 [M = Mo, W] in organic solvents

摘要

Various alkylamine intercalated MS2 (M = Mo, W) have been prepared by reacting LixMS2 with aqueous solutions of the amines. The amine intercalated MS2 exfoliate readily in alcohols. While the shorter amine intercalated MS2 exfoliate better in lower alcohols the longer amine intercalated MS2 exfoliate better in higher alcohols. The longer amine intercalated MS2 exfoliate well even in a nonpolar solvent, toluene. Up to 9 millimoles of MS2 per liter could be dispersed through exfoliation in organic solvents. The dispersions are quite stable and comprise 2D-nanosheets of MS2. Hybrids of MoS2 and WS2 could be prepared by evaporating the solvent from a mixture of colloidal dispersions of amine intercalated MoS2 and WS2. The hybrid exhibits features of a heterostructure in its photoluminescence spectrum.