Zinc oxide nanorods biosensors based on electrochemical reaction for glucose sensing

4^th International Conference and Exhibition on Biosensors & Bioelectronics

September 28-30, 2015 Atlanta, USA

Mohammed Marie and M O Manasreh

University of Arkansas, USA

Posters-Accepted Abstracts: J Biosens Bioelectron

Abstract :

Glucose biosensor based on zinc oxide ZnO nanorods was investigated. A sol â�� gel technique was used in the fabrication process and the working electrode was deposited on glass coated indium tin oxide with an area 0.3x0.3 cm2. Zinc oxide nanorods were well aligned in a hexagonal structure with variety of diameters between 68 â�� 116.3 nm as it shown the scanning electron microscopy image. The Raman and absorbance spectroscopy were used to characterize the material. The absorbance optical peak was observed ~ 370 nm corresponding with the band gap of ZnO 3.37 eV and the measured was performed in the range from 300 â�� 1000 nm. The observed peak in Raman spectrum was at 440 cm-1 matching with the lattice vibration of ZnO. Glucose oxidase GOx and nafion membrane were spin coated with a speed 4000 rotation per minute on top of the nanorods to increase the sensitivity and prevent any undesired chemical reaction. The time response of the fabricated biosensor was 3 sec and the cyclic voltammetry curve illustrates the oxidation reduction process of glucose by GOx and the oxidation peak was around 0.5 V. The obtained sensitivity was 10.911 mA/mM cm2 and the lower limit of detection was 0.22 �¼M which indicates the high performance of the fabricated ZnO biosensor.

Biography :

Email: msmarie@uark.edu