Sayed Ahmad Mozaffari
Iranian Research Organization for Science and Technology (IROST), Iran
Title: Preparation and electrochemical characterization of ZnO based disposable urea biosensors
Biography
Biography: Sayed Ahmad Mozaffari
Abstract
Semiconductor based transducers play an important role in electrochemical sensing. Recently, zinc oxide (ZnO) nanostructures have drawn many attentions in the fabrication of biosensors with many advantages including nontoxicity, biological compatibility, fast electron transfer rates, high specific surface area, high catalytic efficiency and easy preparation. In this presentation, nanostructured zinc oxide thin films were prepared by different deposition methods such as sol-gel, RF magnetron sputtering, and electrochemical deposition on the F-doped SnO2 conductive glass (FTO/ZnO-Nano). The effect of deposition technique on the growth and crystallization of ZnO, morphology, thickness and electrical conductivity of ZnO thin film transducer, enzyme immobilization, enzyme activity and stability, and biosensor response will be discussed. EIS technique as a powerful, non-destructive and informative diagnostic tool has become increasingly popular for biosensing applications and is widely used for studying electrical and electrochemical interfacial properties of a large variety of systems. In these studies the electrochemical impedance spectroscopy (EIS) was applied as an assessment method. The fabricated biosensors showed remarkable stability and reproducibility for urea sensing with high sensitivity, low detection limit, broad dynamic range, fast response time and better calibration curve.
