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

Author(s) Ahmad, R.; Ahn, M.S.; Hahn, Y.B.
Journal J Colloid Interface Sci
Date Published 2017 Jul 15

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 (80.57μAmM(-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.

DOI 10.1016/j.jcis.2017.03.069
ISSN 1095-7103
Citation J Colloid Interface Sci. 2017;498:292297.

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