▎ 摘　　要

NOVELTY - Preparing titanium oxide film flexible electrodes by self-assembly technology comprises preparing two-dimensional titanium dioxide (TiO2) nanosheets using graphene as a template by dispersing the few-layer graphene and a small amount of surfactant into absolute ethanol and continue to sonicate, using liquid nitrogen freeze-drying technology to modify the stacking structure of two-dimensional TiO2 nanosheets by uniformly ultrasonically dispersing the TiO2 nanosheet powder with deionized water to form a suspension, and drying it in a vacuum liquid nitrogen freeze dryer to obtain a porous surface structured TiO2 nanosheets, transferring the two-dimensional TiO2 nanosheet structure to the surface of PET substrate by self-assembly technology by dispersing the TiO2 nanosheets in isopropanol to form suspension, adding the PET substrate into a container, extracting the PET substrate with tweezers and preparing multi-layer films. USE - The electrode is useful in preparing color-changing and display devices, and as secondary battery cathode in electronic material and semiconductor device. ADVANTAGE - The method utilizes titanium dioxide nano-sheet with multi-ion channel structure which promotes charge transfer, thus enhancing photo-electrochemical activity of electrode material, has good crosslinking ability, large contact surface with PET and good adhesion. The electrode has controllable thickness, high electrochemical activity and cyclic electrochemical stability. DETAILED DESCRIPTION - Preparing titanium oxide film flexible electrodes by self-assembly technology comprises preparing two-dimensional titanium dioxide (TiO2) nanosheets using graphene as a template by dispersing the few-layer graphene and a small amount of surfactant into absolute ethanol and continue to sonicate, adding benzyl alcohol and deionized water, and adding the mixed solution on a magnetic stirrer and stir in a water bath, taking a small amount of tetrabutyl titanate and adding it dropwise to the mixed solution, and continuing to stirring, washing and filtering with alcohol to obtain a powder, and drying at room temperature, drying, grinding to obtain two-dimensional TiO2 nanosheets, (2) using liquid nitrogen freeze-drying technology to modify the stacking structure of two-dimensional TiO2 nanosheets by uniformly ultrasonically dispersing the TiO2 nanosheet powder obtained in step (1) with deionized water to form a suspension of 0.2 mg/ml, and drying it in a vacuum liquid nitrogen freeze dryer for many hours to obtain a porous surface structured TiO2 nanosheets, (3) transferring the two-dimensional TiO2 nanosheet structure to the surface of PET substrate by self-assembly technology by dispersing the TiO2 nanosheets obtained in step (2) in isopropanol to form a 2 mg/mL suspension, adding the PET substrate into a container, pouring deionized water and n-hexane in sequence to form a layered interface, drop the suspension into the interface at a constant speed, use the density difference between deionized water and n-hexane to form a stable liquid film, carefully and slowly extracting the PET substrate with tweezers, making the liquid film adhere to the PET substrate, and drying, (4) preparing multi-layer films, repeating the operation of step (3) on the PET attached with TiO2 nanosheets to obtain a titanium oxide thin film flexible electrode with high electrochemical activity.