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Electrochemical and Photoelectrochemical Sensing of Dihydronicotinamide Adenine Dinucleotide and Glucose Based on Noncovalently Functionalized Reduced Graphene Oxide‐Cadmium Sulfide Quantum Dots/Poly‐Nile Blue Nanocomposite
Author(s) -
Jafari Fereydoon,
Salimi Abdollah,
Navaee Aso
Publication year - 2014
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.201400164
Subject(s) - graphene , nanocomposite , quantum dot , cadmium sulfide , oxide , fourier transform infrared spectroscopy , materials science , electrochemistry , graphene quantum dot , inorganic chemistry , chemical engineering , nuclear chemistry , chemistry , nanotechnology , electrode , engineering , metallurgy
Reduced graphene oxide‐CdS quantum dots (rGO‐CdS QDs) nanocomposite was synthesized with a one‐pot and facile solvothermal strategy and characterized with X‐ray diffraction, Fourier transform infrared spectroscopy, and transmission electron microscopy. The nanocomposite modified with electropolymerized Nile blue (NB) had high electrocatalytic and photoelectrocatalytic activity toward NADH oxidation with lowering 700 mV of overvoltage compared to bare GCE. The linear response up to 200 µM was obtained for photoamperometric determination of NADH and the detection limit was 1 µM ( S / N =3). Furthermore, with covalence immobilizing of glucose dehydrogenase onto the nanocomposite, the electrochemical and photoelectrochemical ability of the proposed system toward glucose biosensing was also investigated.