Rapid response electrowetting on dielectric of Ag-ZnO@STA nanocomposite coatings with antibacterial properties and the application for diabetes detection

Electrowetting on dielectric (EWOD) has been developed dynamic blood glucose detection in many special areas of life. However, there are still disadvantages such as slow responsiveness, low sensitivity and poor reproducibility, even no bactericidal function. Herein, the superhydrophobic [email protected]/Zn composite device has been prepared by simple sol-gel and spin-coating techniques, in which [email protected] nanoparticles are embedded into the interspaces of flower-like [email protected] nanosheets and formed the micro-nano hierarchical structure with large surface roughness. The EWOD performance of [email protected]/Zn device is optimized to achieve large contact angle (CA) modulation of 100° and superlow threshold voltage less than 1 V, which completely ensure the success application for the diabetes detection. The CA under voltage is used as a strategy for sensor response, the simulated physiological fluids are used as test liquid in EWOD, the prepared [email protected]/Zn device is endowed with high sensitivity detection ability to glucose with low concentration. More importantly, as the diabetes sensor, the [email protected]/Zn device has excellent anti-corrosion and bactericidal functions.