  Solution processable two-dimensional (2D) materials have provided an ideal
platform for both fundamental studies and wearable electronic applications.
Apart from graphene and 2D dichalcogenides, IVA-VI monochalcogenides (MMCs) has
emerged recently as a promising candidate for next generation electronic
applications. However, the dispersion behavior, which is crucial for the
quality, solubility and stability of MMCs, has been quite unexplored. Here, the
exfoliation and the dispersion behavior of Germanium (II) monosulfide (GeS) and
Tin (II) monosulfide (SnS) nanosheets has been investigated in a wide range of
organic solvents. Nine different organic solvents were examined and analyzed,
considering the solvent polarity, surface tension, and Hansen solubility
parameters. A significant yield of isolated GeS and SnS flakes, namely ~16.4
and ~23.08 {\mu}g/ml in 2-propanol and N-Methyl-2-pyrrolidone respectively were
attained. The isolated flakes are few-layers nanosheets with lateral sizes over
a few hundreds of nanometers. The MMCs colloids exhibit long-term stability,
suggesting the MMCs applicability for scalable solution processable printed
electronic device applications.
