Fabrication of Carbon Coated Nickel/Nitrogen Doped Graphene Composite Film and as Enhancer for Sensitive and Rapid Determination of Sunset Yellow

Abstract

The innovative glassy carbon electrode used in the determination of sunset yellow is modified using a carbon-coated nickel/nitrogen doped graphene composite film. (C-Ni/NGE/GCE). The morphology and structure of different materials (C-Ni and NG) were characterized by transmission electron microscope. When HAc-NaAc (pH=4) was selected as the electrolyte solution, the maximum current of C-Ni/NGE/GCE oxidation peak was reached when the electrolyte concentration was 0.15 mol·L−1, which was a reversible redox peak. The maximum linear range is 1.0×10−4 mol·L−1 and the minimum is 4.0×10−6 mol·L−1. Taking the peak current as the vertical coordinate and SY concentration as the horizontal coordinate, the working standard curve equation obtained by differential pulse voltammetry is Ip(μA)=0.187+56.91c (μmol·L−1 )(R2=0.9992). The detection limit was 5.0×10−8 mol·L−1. The electrochemical behavior of SY shows proton number (X=1) and electron transfer number (n=1). The recovery rate of SY in beverage was 101.5%-103.3%. The following research of sensor to nitrite was the linear range, recovery rate and uL, produced in small experiments.