Moisture-modulated resistive switching behavior based on CaTiO₃ prepared by the appropriate NaOH concentration

It is well known that the multi-mode responsive memristor has a great application prospect in the complex environment. The CaTiO₃-based memristor was prepared under different NaOH concentrations, which exhibited an obvious resistive switching (RS) behavior at the working voltage of 1 V. The experimental results indicate that the purity of CaTiO₃ is affected by different NaOH concentrations, leading to changes in its microstructure. Interestingly, moisture as an electrical stimulus can change the RS behavior. By comparison, a large memory window with stable cycling performance can be observed at the relative humidity (RH) of 60%. A physical model, which involves Ag⁺ ions, oxygen vacancy (V_o) and OH⁻ ions, was proposed to explain the charge transport mechanism of the moisture-modulated RS behavior. As an effective method to improve the memristive characteristics, the moisture-modulated RS behavior provides a great application for multi-mode-controlled memristor in physiological monitoring, such as sweat and infant urine monitoring.