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Magnetite Nanoparticles Bonded Carbon Quantum Dots Magnetically Confined onto Screen Printed Carbon Electrodes and their Performance as Electrochemical Sensor for NADH
Author(s) -
Canevari Thiago C.,
Cincotto Fernando H.,
Gomes Delmarcio,
Landers Richard,
Toma Henrique E.
Publication year - 2017
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201700167
Subject(s) - x ray photoelectron spectroscopy , materials science , electrode , magnetite , detection limit , biosensor , electrochemistry , magnetic nanoparticles , transmission electron microscopy , quantum dot , carbon fibers , nanoparticle , analytical chemistry (journal) , nanotechnology , chemical engineering , composite number , chemistry , chromatography , composite material , engineering , metallurgy
Hybrid magnetite/carbon quantum dots (MagNP/C‐dots) were prepared and their characterization performed by high resolution transmission electron microscopy (HR‐TEM), X‐ray diffraction (XRD) and X‐ray photoelectron spectroscopy (XPS). Because of their suitable magnetization and electrochemical properties, they were used as versatile electrode modifiers after magnetically confining onto screen printed carbon electrodes (SPE), with the aid of a miniature external magnet. The reported strategy introduces a convenient procedure for assembling modified electrodes, since the nanoparticles can be easily released by removing the magnet. The non‐enzymatic magnetic biosensor showed excellent performance in the determination of NADH at the concentration range 2×10 −7 to 5×10 −6 mol L −1 , exhibiting a sensitivity of 0.15 μmol L −1 and detection limit of 20 nmol L −1 . The MagNP/C‐dots/SPE sensor was also successfully applied for the determination of NADH in serum samples. The interference of typical biological molecules has also been investigated.