Using multi-walled carbon nanotubes to enhance coimmobilization of poly(azure A) and poly(neutral red) for determination of nicotinamide adenine dinucleotide and hydrogen peroxide

Kuo Chiang Lin, A. T. Ezhil Vilian, Shen Ming Chen

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

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 languageEnglish
Pages (from-to)45566-45574
Number of pages9
JournalRSC Advances
Volume4
Issue number85
DOIs
StatePublished - 2014

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