Issue 91, 2014

Multi-walled carbon nanotubes decorated with palladium nanoparticles as a novel platform for electrocatalytic sensing applications

Abstract

A simple method is described for decorating multi-walled carbon nanotubes (MWCNTs) with palladium nanoparticles (PdNPs). MWCNTs were functionalized via a C–C covalent bond with metformin (Met/fMWCNT). The subsequent bonding of the imine groups with palladium offered strong adhesion of PdNPs on functionalized MWCNT surface (Pd@Met/fMWCNT). The structure and morphology of the resulting MWCNT-based nanocomposite were characterized by transmission electron microscopy, X-ray diffraction and FT-IR. Pd@Met/fMWCNT nanocomposite was used to immobilize glucose oxidase (GOx) on glassy carbon electrode. Detailed electrochemical analysis was performed and it was found that Pd@Met/fMWCNT nanocomposite significantly improved direct electron transfer between GOx and glassy carbon electrode, leading to fabrication of a potential biosensor offering very sensitive detection of glucose. The surface coverage of GOx and the electron transfer rate constant (ks) were calculated to be 4.17 × 10−10 mol cm−2 and 3.24 s−1, respectively. The apparent Michaelis–Menten constant of the immobilized GOx was 0.48 mM, implying a strong catalytic activity and a remarkable affinity of the immobilized GOx for glucose. The linear detection range of glucose was 4.0–1500 μM, with a detection limit of 1.4 ± 0.04 μM.

Graphical abstract: Multi-walled carbon nanotubes decorated with palladium nanoparticles as a novel platform for electrocatalytic sensing applications

Associated articles

Article information

Article type
Paper
Submitted
12 Mha 2014
Accepted
18 Ndz 2014
First published
18 Ndz 2014

RSC Adv., 2014,4, 49595-49604

Multi-walled carbon nanotubes decorated with palladium nanoparticles as a novel platform for electrocatalytic sensing applications

M. Baghayeri, H. Veisi, H. Veisi, B. Maleki, H. Karimi-Maleh and H. Beitollahi, RSC Adv., 2014, 4, 49595 DOI: 10.1039/C4RA08536A

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