Fig. 1: Schematics of a tube memristor and its response recorded using a source measure unit (SMU).
From: EGaIn tube memristors offering reliable switching on a biological time scale

a EGaIn tube memristor is composed of two external copper electrodes inserted into a plastic tube. The electrodes' surfaces facing each other are covered with EGaIn and are separated by 3M NaOH solution. b Measurement setup. c–e Representative examples of current–voltage curves. The recording in (c) was obtained using the voltage ramp, γ, of 0.09 V/s. f Temporal current response to a constant voltage level, V0. “V0 = 0.6 V → 0.2 V” indicates the measurement at V0 = 0.2 V was performed after the device was switched to its off state by applying V0 = 0.6 V.