fig6

Figure 6. (A) Schematic and SEM images of the chemo-memristive gas sensor, showing the Pt/TiO₂ nanorod/TiN crossbar structure and the highly porous morphology of TiO₂ nanorods; (B) Response curves of TiO₂ nanorods and NiO nanorods upon exposure to 1% H₂ before electroforming; (C) Schematic illustration of the sensor response to H₂ in the initial state and after the formation of oxygen vacancies induced by the reaction with H₂. Response curves of TiO₂ nanorods and NiO nanorods in high resistance state (HRS) and low resistance state (LRS) (red line in inset); (D) Hysteretic response curve of TiO₂ nanorods to 10 consecutive 0.2% H₂ pulses after electroforming; (E) Schematic illustration of controlling the synaptic weights based on the generation and elimination of oxygen vacancies using different target gases; (F) Three sequential conductance modulations based on the type of target gas (reducing or oxidizing); (G) 3D image of the trend in sensor response measured at 25 different locations; (H) MNIST-based neural network simulation for gas generation location inference and corresponding recognition accuracy (~ 92.76%). Reprinted with permission. Copyright 2023(A-H)^[18], Wiley. Distributed under the terms of the CC BY-NC-ND license. No modifications have been made to the original images. PPF: Paired-pulse facilitation; PPD: paired-pulse depression; SEM: scanning electron microscopy; MNIST: Modified National Institute of Standards and Technology.