Study On Preparation And Properties Of Boehmite-based Memristors

The increasing demand for real-time and long-term monitoring of human health in recent years has generated great interest in developing implantable memristors with resistive switching properties and biocompatibility.Currently,natural biomaterials represented by protein and glucose are considered as the main candidates for building the next generation of implantable memristors due to their excellent biocompatibility.However,protein-based biomemristors have relatively poor switching performance,which are not conducive to the expansion of implantable memristors.Therefore,it is imperative to seek candidate materials for novel biomemristors with excellent memristive properties and outstanding biosafety.In this paper,AlOOH with good biocompatibility is selected as the resistive switching layer material of the memristor for the first time.A series of boehmite-based memristors with memristive function were successfully fabricated.A series of characterization techniques analyze the composition and microstructure of boehmite.Keithley 4200semiconductor test platform was used to test its electrical properties and characterized the resistive memory,synaptic properties and nociceptor behavior of boehmite-based memristors.In addition,the resistance-switching mechanism of the boehmite-based memristor is elucidated based on the DFT.The excellent biocompatibility of boehmite-based memristors was confirmed by the CCK-8 test and in vivo experiments in mice.Specific research contents include:1.Boehmite nanosheets were synthesized by a hydrothermal method,and a flexible biomemristor was successfully fabricated by drop coating,and realizes four discrete resistance levels at different I_CC,showing stable multi-resistance states,and all four states are high durability（>10³ cycles）and reliable resistance state retention（>3.2×10³ s）,it is significantly better than protein-based biological memristors under the same conditions.2.Boehmite nanoparticles were synthesized by sol-gel method,and Pt/AlOOH/ITO:PET memristor was successfully fabricated by spin coating method.The memristor exhibits excellent flexibility,high transparency,and good biocompatibility with low threshold voltage and high on-off ratio（>10³）with good switching durability（>10⁴ cycles）and retention time（>2×10⁴ s）.This flexible memristor systematically simulates synaptic functions,and realizes behaviors such as sensitization,desensitization,hyperalgesia,and allodynia of real nociceptors.3.Innovatively reveal the direct effect of boehmite hydrogen bonds on memristive behavior through DFT calculations and experimental simulations.The carrier mobility of boehmite under the action of electric field is further calculated by phonon scattering mechanism(247cm²·V^-1·s^-1).The high carrier mobility is attributed to the tunnel effect formed in the layered AlOOH material,which improves the hydrogen proton transport properties.4.The excellent biocompatibility of AlOOH nanosheets was confirmed by CCK-8 test.In addition,flexible memristive devices were implanted in mice to test the biosafety of the devices.The results indicate the AlOOH device has good biocompatibility in vivo and has the potential for implantable applications.The AlOOH-based memristive devices studied in the work are promising candidates for flexible biocompatible electronics.This work provides a new direction for the material selection of wearable and implantable memristors.47 Figures,7 Tables and 145 References are listed in the dissertation.