Abstract
An electrochemical glucose sensor based on zinc oxide (ZnO) nanorods is
fabricated, characterized and tested. The ZnO nanorods are synthesized on indium
titanium oxide (ITO) coated glass substrate, using the hydrothermal sol-gel
technique. The working principle of the sensor under investigation is based on
the electrochemical reaction taking place between cathode and anode, in the
presence of an electrolyte. A platinum plate, used as the cathode and
Nafion/Glucose Oxidase/ZnO nanorods/ITO-coated glass substrate used as anode, is
immersed in pH 7.0 phosphate buffer solution electrolyte to test for the
presence of glucose. Several amperometric tests are performed on the fabricated
sensor to determine the response time, sensitivity and limit of detection of the
sensor. A fast response time less than 3 s with a high sensitivity of 1.151 mA
cm-2mM-1 and low limit of detection of 0.089 mM is
reported. The glucose sensor is characterized using the cyclic voltammetry
method in the range from -0.8 – 0.8 V with a voltage scan rate of 100
mV/s.