Galactose biosensor based on ZnO nano material

Abstract

ZnO nanomaterial is a n-type semiconductor material and exits in a variety of one-dimensional nanostructures such as: nanorods, nanotubes, nanowalls, nanowires, ect… [3]. They have potential applications in making devices such as: light emiting diodes, optical waveguides, nanolaser, gas sensor, biosensor. Due to the high surface area to volume ratios, nontoxicity, chemical stability, biocompatibility, the high isoelectric point (IEP: 9.5), ect…; ZnO nanorods were largely used for biosensor. In this work, we developed enzyme electrode biosensor based on ZnO nanorods to test galactose solution by immobilizing galactose oxidase on ZnO nanorods grown on FTO substrate. The result showed that the proposed biosensor had the linear detection range from 40 to 230 mM galactose solution.