A carbon nanotube PVC based matrix modified with glutaraldehyde suitable for biosensor applications

Carbon nanotubes (CNTs) are offering a great promise for developing electrochemical sensors. Distinctive properties of CNTs such as a high surface area, ability to accumulate analyte, minimization of surface fouling and electrocatalytic activity are very attractive for electrochemical sensing. The electrochemical study of a glassy carbon (GC) electrode coated with a matrix based in multiwall carbon nanotubes (MWCNTs), tetrahydrofuran (THF) mixed with poly(vinyl chloride) (PVC) and with a glutaraldehyde (GA) solution (MWCNTs-TPG/GC), for β-Nicotinamide adenine dinucleotide (NADH) detection is discussed in this work using cyclic voltammetry (CV) and chronoamperometry. The used CNTs matrix promotes better the electron transfer of NADH minimizing the fouling effect. The obtained results show remarkable electrochemical and mechanical advantages of MWCNTs-TPG/GC electrode compared to bare glassy carbon electrode with a great promise for future amperometric biosensors applications. © 2008 Wiley-VCH Verlag GmbH & Co. KGaA.