CuO decorated TiCT MXene composites for non-enzymatic glucose sensing with large linear ranges.

TiCT MXene/CuO composites were prepared by acid etching combined with electrochemical technique. The abundant active sites on the surface of MXene greatly increase the loading of CuO nanoparticles, and the synergistic effect between the different components of the composite can accelerate the oxidation reaction of glucose. The results indicate that at the working potential of 0.55 V (vs. Ag/AgCl), the glucose sensor based on TiCT MXene/CuO composite presents large linear concentration ranges from 1 µM to 4.655 mM (sensitivity of 361 µA mM cm) and from 5.155 mM to 16.155 mM (sensitivity of 133 µA mM cm). The limit of detection is 0.065 µM. In addition, the sensor effectively avoids the oxidative interference of common interfering species such as ascorbic acid, dopamine and uric acid. The sensor has good reproducibility, stability and acceptable recoveries for the detection of glucose in human sweat sample (97.5-103.3%) with RSD values less than 4%. Based on these excellent properties it has great potential for the detection of glucose in real samples.