title: Synthesis and characterization of graphene quantum dots/CoNiAl-layered double-hydroxide nanocomposite: Application as a glucose sensor.
abstract: 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; 0.01-14.0 mM with a detection limit of 6 μM (S/N = 3) and high sensitivity of 48.717 μAmM-1. Finally, the sensor was successfully applied to determine the glucose in real samples which demonstrated its applicability.
authors.affiliation: Inorganic Chemistry Laboratory, Department of Chemistry, Faculty of Sciences, Azarbaijan Shahid Madani University, Tabriz 53714-161, Iran.
authors.forename: Sara
authors.initials: S
authors.lastname: Samuei
authors.affiliation: Electroanalytical Chemistry Laboratory, Department of Chemistry, Faculty of Sciences, Azarbaijan Shahid Madani University, Tabriz 53714-161, Iran.
authors.forename: Jila
authors.initials: J
authors.lastname: Fakkar
authors.affiliation: Inorganic Chemistry Laboratory, Department of Chemistry, Faculty of Sciences, Azarbaijan Shahid Madani University, Tabriz 53714-161, Iran. Electronic address: zrezvani@azaruniv.ac.ir.
authors.forename: Zolfaghar
authors.initials: Z
authors.lastname: Rezvani
authors.affiliation: Organic Chemistry Laboratory, Department of Chemistry, Faculty of Sciences, Azarbaijan Shahid Madani University, Tabriz, 53714-161, Iran.
authors.forename: Ashkan
authors.initials: A
authors.lastname: Shomali
authors.affiliation: Electroanalytical Chemistry Laboratory, Department of Chemistry, Faculty of Sciences, Azarbaijan Shahid Madani University, Tabriz 53714-161, Iran. Electronic address: B.Habibi@azaruniv.ac.ir.
authors.forename: Biuck
authors.initials: B
authors.lastname: Habibi
mesh_terms: D015374:Biosensing Techniques / Q000379:methods; D002244:Carbon / Q000737:chemistry; D055664:Electrochemical Techniques / Q000379:methods; D004566:Electrodes; D005947:Glucose / Q000032:analysis*; D006108:Graphite / Q000737:chemistry*; D006801:Humans; D006878:Hydroxides / Q000737:chemistry*; D007770:L-Lactate Dehydrogenase / Q000737:chemistry; D008670:Metals / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning / Q000379:methods; D053761:Nanocomposites / Q000737:chemistry*; D045663:Quantum Dots; D014961:X-Ray Diffraction / Q000379:methods
chemical_list: D006878:Hydroxides; D008670:Metals; D002244:Carbon; D006108:Graphite; D007770:L-Lactate Dehydrogenase; D005947:Glucose
keywords: Electrocatalytic; Glucose; Graphene quantum dots; Layered double-hydroxide; Non-enzymatic; Sensor