Abstract
A novel nano-sized tetragonal pyramid-shaped porous ZnO (TPSP-ZnO) structure was, for the first time, prepared with a high morphological yield by a simple polyglycol-assisted wet chemical method. It was found that the polyglycol had a significant influence on the nucleation and pore formation in the ZnO nanostructure. The OH−concentration and the zinc counter-ion affected the morphology of the produced ZnO nanostructure. TPSP-ZnO can be used as an efficient matrix for immobilizing horseradish peroxidase (HRP) and applied to sense hydrogen peroxide (H2O2). Interestingly, it had better biosensing properties than solid spherical ZnO nanoparticles, which might result from the larger specific surface area of TPSP-ZnO, causing a higher HRP loading, and the tetragonal pyramid-shaped porous nanostructure having high fraction of surface atoms located on the corners and edges, resulting in an improved catalytic activity.
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