ZnO nanorods array based field-effect transistor biosensor for phosphate detection.

Title ZnO nanorods array based field-effect transistor biosensor for phosphate detection.
Authors R. Ahmad; M.S. Ahn; Y.B. Hahn
Journal J Colloid Interface Sci
DOI 10.1016/j.jcis.2017.03.069
Abstract

A promising field-effect transistor (FET) biosensor has been fabricated based on pyruvate oxidase (PyO) functionalized ZnO nanorods (ZnO NRs) array grown on seeded SiO2/Si substrate. The direct and vertically grown ZnO NRs on the seeded SiO2/Si substrate offers high surface area for enhanced PyO immobilization, which further helps to detect phosphate with higher specificity. Under optimum conditions, the fabricated FET biosensor provided a convenient method for phosphate detection with high sensitivity (80.57?AmM(-1)cm(-2)) in a wide-linear range (0.1µM-7.0mM). Additionally, it also showed very low effect of electroactive species, stability and good reproducibility. Encouraging results suggest that this approach presents a promising method to be used for field measurements to detect phosphate.

Citation R. Ahmad; M.S. Ahn; Y.B. Hahn.ZnO nanorods array based field-effect transistor biosensor for phosphate detection.. J Colloid Interface Sci. 2017;498:292297. doi:10.1016/j.jcis.2017.03.069

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