Acetonitrile-Assisted Exfoliation of Layered Grey and Black Arsenic: Contrasting Properties
Two-dimensional nanostructures of elements beyond graphene have received in recent years great attention due to their outstanding properties. Out of these elements only arsenic is known to form different allotropes with layered structure in bulk form. Orthorhombic arsenic, also termed as “black arsenic”, is a metastable form of arsenic with a structure analogous to black phosphorus and rhombohedral arsenic is known as “grey arsenic”. Here we compare the exfoliation of black and grey arsenic in acetonitrile in high yield forming stable colloidal solutions of exfoliated material. Together with exfoliation procedure, the detail structural and chemical analysis are provided as well as potential applications in gas sensing and photothermal absorption are demonstrated for potential future arsenic-based devices.