ZnO nanorods array based field-effect transistor biosensor for phosphate detection
2017; Elsevier BV; Volume: 498; Linguagem: Inglês
10.1016/j.jcis.2017.03.069
ISSN1095-7103
AutoresRafiq Ahmad, Min‐Sang Ahn, Yoon‐Bong Hahn,
Tópico(s)Electrochemical sensors and biosensors
ResumoA 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 μA mM−1 cm−2) in a wide-linear range (0.1 µM–7.0 mM). 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.
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