Extended Data Fig. 8: Proton transport on SLBs.
From: Single-chain heteropolymers transport protons selectively and rapidly
a, Liquid atomic force microscopy images of a Pd surface covered with SLBs, showing a surface roughness of about 0.74 nm. b, Image for SLB+RHP1 (RHP1-to-lipid molar ratio, 0.001), showing a roughness of about 2.07 nm. c, Surface covered with SLB+RHP1 (RHP1-to-lipid molar ratio, 0.01), showing a roughness of about 5.61 nm. d, Current–voltage sweep of the protonic device. The Pd/SLB contact has a current of <0.01 nA across the entire voltage range, confirming the high polarization resistance of the SLB (black trace). With RHP1 incorporated, an oxidation peak is observed at about 48 mV, indicating H+ flow across the SLB; a reduction peak is observed at about −45 mV, indicating conduction of H across the SLB.
