Preparation of ZnO/Ti3C2Tx/Nafion/Au electrode

In this study, monolayer titanium carbide (Ti3C2Tx) material was prepared, then the modified ZnO and Ti3C2Tx were self-assembled to obtain the MXene based composite material. Finally, ZnO/Ti3C2Tx/Nafion/Au electrodes were prepared to construct a dopamine electrochemical sensor for detection of dopamine. SEM, XRD measurements and so on verified the synthesis of monolayer Ti3C2Tx and preparation of the MXene based composite material. Utilizing Chronoamperometry (I-t), we found the electrodes displayed a linear dynamic range from 0.1 to 1200 μM with a limit of detection of 0.076 μM (S/N = 3). Meanwhile, the sensitivity of the sensor is 96nA/μM and in the prepared biological samples, the recoveries of the sensor were 97.8%∼102.2%. Finally, the electrochemical sensor showed a good reproducibility and stability.