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
16 شوال 1435
Accepted
23 ذو القعدة 1435
First published
23 ذو القعدة 1435

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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