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Title
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Multi-walled carbon nanotubes decorated with palladium nanoparticles as a novel platform for electrocatalytic sensing applications
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Type
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JournalPaper
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Keywords
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Multi-walled carbon nanotubes, palladium nanoparticles, electrocatalytic
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Abstract
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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.
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Researchers
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Hadi Beitollahi (Not In First Six Researchers), Hassan Karimimaleh (Fifth Researcher), Behrooz Maleki (Fourth Researcher), Hamed Veisi (Third Researcher), Hojat Veisi (Second Researcher), Mehdi Baghayeri (First Researcher)
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