Published online by Cambridge University Press: 24 February 2016
An electrochemical glucose sensor based on zinc oxide (ZnO) nanorods isfabricated, characterized and tested. The ZnO nanorods are synthesized on indiumtitanium oxide (ITO) coated glass substrate, using the hydrothermal sol-geltechnique. The working principle of the sensor under investigation is based onthe electrochemical reaction taking place between cathode and anode, in thepresence of an electrolyte. A platinum plate, used as the cathode andNafion/Glucose Oxidase/ZnO nanorods/ITO-coated glass substrate used as anode, isimmersed in pH 7.0 phosphate buffer solution electrolyte to test for thepresence of glucose. Several amperometric tests are performed on the fabricatedsensor to determine the response time, sensitivity and limit of detection of thesensor. A fast response time less than 3 s with a high sensitivity of 1.151 mAcm-2mM-1 and low limit of detection of 0.089 mM isreported. The glucose sensor is characterized using the cyclic voltammetrymethod in the range from -0.8 – 0.8 V with a voltage scan rate of 100mV/s.