Evolution from CRS to SRS in a multifunctional Ag/TiO₂@MoO₃/Ti memristor for emotional perception application

The emerging information technologies related to artificial intelligence (AI) have intensified the high-power data movement of traditional von Neumann systems in time and space, and the demand for information processing systems with high-density storage and high-speed computing capabilities has become an inevitable development trend. In this work, the Ag/TiO₂@MoO₃/Ti device was prepared by hydrothermal methods, which shows the evolution from capacitive coupled resistive switching (CRS) behavior to self-rectifying coupled resistive switching (SRS) behavior by adjusting the thickness of TiO₂@MoO₃ film and applied voltage amplitude. In addition, the CRS behavior with four different characteristics was realized simultaneously in the Ag/TiO₂@MoO₃/Ti device by controlling the applied voltage, and an emotion sensing system based on human sweat was proposed by testing the response currents in NaCl solution with different mass concentrations (MCs). Finally, based on the in-depth analysis of the experimental data, combined with the energy band theory, the conductive filaments (CFs) model formed by the interaction of ions and electrons and an internal electric field model were proposed to explain the evolution process. Therefore, this work has great guiding significance for understanding the physical mechanisms of the evolution between CRS and SRS, and promotes the application prospects of multifunctional memristor in AI.