Abstract
A poly(brilliant cresyl blue) (PBCB) functionalized single walled-carbon nanotube (SWCNT) modified glassy carbon electrode (PBCB/SWCNT/GCE) is fabricated by electropolymerization. The electrocatalytic activity of the PBCB/SWCNT/GCE towards the reduction of hydrogen peroxide is then investigated. The electrode shows high sensitivity [4.1 nA (μM) −1] to the electrocatalytic reduction of H2O2 at an applied potential of −0.30 V (vs. SCE). Important practical advantages such as a fast response time (within 5 s), a low detection limit (0.12 μM), wide linear dynamic range (4.9 × 10−7 to 2.3 × 10−4 M, R2 = 0.994) and stability (remains ∼93% of its original activity after 30 days) are achieved with the PBCB/SWCNT/GCE. Further, the presence of probable interferences such as glucose, ascorbic acid, dopamine and uric acid does not interfere during the detection of H2O2. The application of the sensor to determine H2O2 in tap water with recovery values of 96% to 102% shows the sensor is suitable for routine analysis.
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