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Abstract
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In the present work, a novel nanocomposite based on the graphene quantum dots and CoNiAl-layered
double-hydroxide was successfully synthesized by co-precipitation method. To achieve the morphological,
structural and compositional information, the resulted nanocomposite was characterized by
scanning electron microscopy X-ray diffraction, thermal gravimetric analysis, Fourier transform infrared
spectroscopy, and photoluminescence. Then, the nanocomposite was used as a modifier to fabricate a
modified carbon paste electrode as a non-enzymatic sensor for glucose determination. Electrochemical
behavior and determination of glucose at the nanocomposite modified carbon paste electrode were
investigated by cyclic voltammetry and chronoamperometry methods, respectively. The prepared sensor
offered good electrocatalytic properties, fast response time, high reproducibility and stability. At the
optimum conditions, the constructed sensor exhibits wide linear range; 0.01e14.0 mM with a detection
limit of 6 mM (S/N ¼ 3) and high sensitivity of 48.717 mAmM1. Finally, the sensor was successfully
applied to determine the glucose in real samples which demonstrated its applicability.
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