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ZnO nanorods array based field-effect transistor biosensor for phosphate detection
- Ahmad, Rafiq, Ahn, Min-Sang, Hahn, Yoon-Bong
- Journal of colloid and interface science 2017 v.498 pp. 292-297
- biosensors, nanorods, phosphates, pyruvate oxidase, surface area, transistors, zinc oxide
- 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⁻¹cm⁻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.