Cape Peninsula University of Technology, South Africa
Title: Solution deposition of Cu doped Co3O4 for electrooxidation of glucose
Biography: Mahabubur Chowdhury
One of the major causes of death and disability in the world is due to diabetes mellitus. The frequent testing of physiological blood glucose levels to avoid grave emergencies is vital for the confirmation of effective diabetic treatment. The current glucose sensors that are being used by diabetic patients are glucose oxidase sensors. However, due to problems associated with fabrication of enzymatic glucose sensors, non-enzymatic glucose sensors have been of focus recently. In this study, a simple solution-based deposition process has been utilized to fabricate a Cu doped Co3O4 electrode for non-enzymatic glucose detection. The substitution of Cu into the Co3O4 host lattice resulted in an enhanced electrochemical performance compared to the pristine Co3O4 as was measured from the Hall Effect measurement. The sensor exhibited two distinctive linear ranges covering upto 7.6 mM at an applied potential of + 0.65 V vs. Ag/AgCl in 0.1 M NaOH solution. The sensor depicted good repeatability (RSD of <10%), stability and reproducibility (RSD of <10%). The sensitivity of the sensor was determined to be 1333 μA/cm2 mM (lower concentration range) and 141 μA/cm2 mM (upper concentration range), with a lower detection limit of 0.15 μM (S/N=3). The as prepared electrode showed a response time of <10 seconds and was very selective towards glucose in the presence of various interference species (Figure-1). The ease of fabrication, good electrochemical activity and good inter and intra electrode reproducibility makes this electrode a promising candidate for non-enzymatic glucose detection.