Fig. 8.

(A) Schematic design display the mechanism of glucose sensor using of the glucose oxidase (GOx) on the Fe3O4–chitosan nanoparticles for catalytic oxidation of glucose producing the H2O2 enzymatically generated. Furthermore, the Au NPs enhanced the catalytic oxidation of luminol via H2O2, Reproduced with permission [178]. (B) Schematic decoration of ZnO NW by GOx that surrounded by glucose under experimental conditions of i) no strain, and ii) compressive strain; iii) Scanning electron microscope (SEM) of low- and high-magnification of ZnO NWs; iv) I–V signaling of ZnO NWs-glucose biosensor, and the inset photos show digital and optical microscopy, respectively; v) I–t signaling of ZnO NWs-glucose biosensor as function of glucose concentrations, (v)-inset) The experimental set-up system [181].