Extended Data Fig. 3: Meniscus-surface contact.
From: Proton transport through nanoscale corrugations in two-dimensional crystals
a, Schematic of the approach and retract stages for our scanning protocol. b, Example of Idc - t characteristics (ion current between the two electrodes in the nanopipette) for proton conducting (blue) and non-conducting (red) areas in a graphene device. c, Map showing changes in Idc during step ii with respect to the current in step i (ΔIdc = \({I}_{{\rm{dc}}}^{{\rm{ii}}}\) − \({I}_{{\rm{dc}}}^{{\rm{i}}}\)) for the graphene device in b. d, Map of ΔIdc = \({I}_{{\rm{dc}}}^{{\rm{iii}}}\) − \({I}_{{\rm{dc}}}^{{\rm{i}}}\) for the same device. e–g, Same as in panels b–d but for a monolayer hBN device. Scale bars, 1 μm.
