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

AbstractA 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 μM 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.

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