Abstract
Coimmobilization of poly(azure A) (PAA) and poly(neutral red) (PNR) has been successfully performed and further enhanced by a multi-walled carbon nanotube (MWCNT) modified electrode. The PAA-PNR/MWCNTs hybrid composite is electroactive, pH-dependent, and stable in the electrochemical system. It shows electrocatalytic activity toward nicotinamide adenine dinucleotide (NADH) and hydrogen peroxide (H2O2) with high current response and low overpotential. By amperometry, it shows a high sensitivity of 265.8 μA mM-1cm-2toward NADH (Eapp.= +0.05 V). Linearity is estimated in a concentration range of 1 × 10-6to 1.455 × 10-3M with a detection limit of 1 × 10-7M (S/N = 3). It shows a high sensitivity of 10.3 μA mM-1cm-2toward H2O2(Eapp.= -0.25 V) with a linear concentration range of 8 × 10-4to 1.91 × 10-3M and a detection limit of 1 × 10-6M (S/N = 3). By the result, it proves the coimmobilization and activity of PAA and PNR can be effectively enhanced by MWCNTs, suggesting a bifunctional sensor for determination of NADH and H2O2.
Original language | English |
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Pages (from-to) | 45566-45574 |
Number of pages | 9 |
Journal | RSC Advances |
Volume | 4 |
Issue number | 85 |
DOIs | |
State | Published - 2014 |