Extended Data Fig. 1: Determine the thickness of the intrinsic water layer on the diamond surface.
From: Experimental observation of liquid–solid transition of nanoconfined water at ambient temperature
(a) Topographic image of diamond surface without the hBN flake, corresponding to the open system. The position of the NV center was determined by the procedures described in Supplementary Fig. 1, denoted as an orange dashed circle with the nearby reference protrusion being marked by an arrow. (b) Topographic image of the same area with the hBN flake and without confined water molecules, which was confirmed by the nanoscale-NMR measurement. (c) Z-profile was measured along the dashed line in (a) (black) and in (b) (red). The position of the NV center was estimated with an uncertainty denoted by the shades. The measured height difference of the two profiles indicates the thickness of the intrinsic water layer on the diamond surface: dwater = 2.7 ± 0.2 nm. Scale bar: 250 nm.
