Co3O4/ZnO/CNTs Photoelectrochemical Sensor for Sensitive and Selective LA Detection

As an intermediate product of an important biological tumor marker, lactic acid (LA) seriously affects human health and athlete body assessment, and the sensitivity detection of LA in human fluids is crucial. In this work, Co3 O4 /ZnO/CNTs electrodes were prepared by simple hydrothermal and annealing methods, and the electrode materials and photoelectrochemical (PEC) properties were systematically characterized and tested. In the simulated sweat samples, the Co3 O4 /ZnO/CNTs electrodes had a linear relationship with the LA concentration in the range of 0.1-100 mu m, with a linear correlation coefficient of 0.995 and high sensitivity and low detection limits, respectively, of 165.8 mu AmM-1 cm(-2) and 0.01 mu m, respectively. The electrode opens up new frontiers for enzyme-free, noninvasive, and real-time monitoring.

Automated summary

In this study, Co3 O4/ZnO/CNTs electrodes were prepared and used for the sensitive detection of lactic acid (LA) in human fluids. The electrodes showed high sensitivity and low detection limits, making them suitable for enzyme-free, noninvasive, and real-time monitoring.