Fig. 6: AFM and KPFM studies to identify the exposed top surface.

a AFM-derived force of adhesion distributions on exfoliated SnTiS₃ flakes. b DFT-predicted adsorption energy of water molecules on SnS and TiS₂-terminated SnTiS₃ surfaces. c KPFM-derived work function on exfoliated SnTiS₃ surface and DFT-predicted work function of SnS and TiS₂-terminated SnTiS₃ surfaces.