Abstract
In order to prepare poly-(3-hexylthiophene) (P3HT)/octadecylamine (ODA)/ glucose oxidase (GOx) mixed monolayer,P3HT/ODA mixed monolayer was used as a template to adsorb GOx from solution to air/liquid interface by interactions between the template and GOx. The behaviors of the P3HT/ODA/GOx mixed monolayer at air/liquid interface were studied by the pressure-area (π-A) isotherm and the pressure-time (π-t) isotherm. The morphology of the P3HT/ODA/GOx mixed LB film was examined using an atomic force microscope (AFM). The monolayers were then transferred on Pt substrates to fabricate biosensors for sensing study on LB films characteristics. The P3HT aggregation at air/liquid interface can be controlled by regulating the concentration of the P3HT/ODA solution.P3HT chains extend at air/liquid interface while the degree of P3HT aggregation decrease and they fix the adsorbed GOx molecules.The sensing experiments demonstrate that performance of sensors is enhanced with improvement of the P3HT aggregation.The sensor exhibits the highest current sensitivity (4.2μA/cm2.Mm) and the lowest the slope of current change (0.106μA/cm2.s). It is possible to improve the P3HT aggregation by interactions between ODA and P3HT and to fabricate P3HT on sensors for immobilizing enzyme and transferring electron.
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