The Facile Synthesis of Novel ZnO Nanostructure for Galactose Biosensor Application

We introduce a novel structure of ZnO nanorods (NRs) grown on ZnO NRs (ZnO NRs/NRs) via a facile, low-cost, and environmentally friendly synthesis for galactose biosensor application. The galactose oxidase enzyme (GalO(x)) is immobilized on the ZnO NR/NR surface to form the novel electrode structure (GalO(x)|ZnO NRs/NRs). The GalO(x)|ZnO NR/NR electrode has a linear detection range of current density from 11.30A/mm(2) to 18.16A/mm(2) over a galactose concentration range from 40mM to 230mM, indicating the increment of electrode sensitivity up to 60.7%. The ZnO NR/NR morphology with a high surface area to volume ratio has a great contribution to the electrochemical performance of galactose biosensor. Our results propose a straightforward approach to fabricate architecturally ZnO-based nanostructure for biosensor application.