Figure 3

A Cyclic voltammograms of a 4% untreated MWCNT-GCPE, b plain GCPE, c 4% untreated DWCNT-GCPE for 1 mM catechol in 50 mM phosphate buffer at 0.1 V s⁻¹; B Cyclic voltammograms of a 4% treated glassy carbon μ-particles-included GCPE, b 4% treated DWCNT-GCPE, c 4% treated MWCNT-GCPE for 1 mM catechol in 50 mM phosphate buffer at 0.1 V s⁻¹