MWCNT-ruthenium oxide composite paste electrode as non-enzymatic glucose sensor

A non-enzymatic glucose sensor of multi-walled carbon nanotube-ruthenium oxide/composite paste electrode (MWCNT-RuO2/CPE) was developed. The electrode was characterized by using XRD, SEM, TEM and EIS. Meanwhile, cyclic voltammetry and amperometry were used to check on the performances of the MWCNT-RuO2/CPE towards glucose. The proposed electrode has displayed a synergistic effect of RuO2 and MWCNT on the electrocatalytic oxidation of glucose in 3 M NaOH. This was possible via the formation of transitions of two redox pairs, viz. Ru(VI)/Ru(IV) and Ru(VII)/Ru(VI). A linear range of 0.5-50 mM glucose and a limit of detection of 33 mu M glucose (S/N=3) were observed. There was no significant interference observable from the traditional interferences, viz, ascorbic acid and uric acid. Indeed, results so obtained have indicated that the developed MWCNT-RuO2/CPE would pave the way for a better future to glucose sensor development as its fabrication was without the use of any enzyme. (c) 2012 Elsevier B.V. All rights reserved.