Fig. 6: Pore size modulation by pH control.
a An illustrative description of a chemistry-driven autonomous membrane interfacing 2 M MnCl2 and acidic PBS with HCl. b Ionic current traces recorded for the MnCl2/(PCB + HCl) systems with a 100 nm nanopore in a 20 nm-thick SiNx membrane under Vb = −0.5 V. pH at trans is 6.7 (red) and 3.2 (blue). c–e Ip versus td scatter plots for the cases of pH 6.7 (c), 5.2 (d), and 3.2 (e). f Log10Ip distributions at pH 6.7 (red), 5.2 (green), and 3.2 (blue) at the trans. g Average Ip estimated by the Gaussian fits. Axis at the right denotes the pore diameter dpore estimated from the pulse heights based on Maxwell–Hall’s model. h Variations in the pulse heights are represented as the full-widths at half-maxima of the Gaussian peaks fitted in (f).
