Amperometric response of GOx/RTIL/NH2-MWCNTs/GC (a) and GOx/NH2-MWCNTs/GC (b) electrodes to glucose. The electrodes were held at −0.51 V (versus Ag/AgCl), while its rotation speed was 500 rpm in 0.1 M PBS, pH 7.0. The final concentration of glucose after each successive addition was 0.10, 0.25, 0.50, 0.87, 1.36, 2.0, 2.7, 3.5, 4.4, 5.4, 6.5, 7.7, 9.0, 10.3, 11.7, 13.1, 14.6, 16.1, 17.7, 19.3, 20.9, 22.5, 24.3, 26.4, 28.8, 31.0, 33, 35.3, 37.6, 40, 43, 45.6, and 48.3 μM, respectively. Inset shows the calibration plot for glucose.
