Stanene sheet. Computer artwork showing the molecular structure of a sheet of stanene. Stanene is the name given by researchers to 2-dimensional sheets of tin (silver-coloured) that are only 1-atom thick, in a manner similar to graphene. Stanene is a theoretical topological insulator that may display superconductivity at its edges above room temperature. The addition of fluorine (green) atoms to the tin lattice could extend the critical temperature up to 100MB degrees Celsius.