Nickel (II) phthalocyanine-tetrasulfonic-Au nanoparticles nanocomposite film for tartrazine electrochemical sensing

[Display omitted] •Efficient LbL Film Based Voltage Detection Sensor (AuNP-PAH/NiTsPc)5.•The composition of AuNp with NiTiPc makes highly stable and sensitive sensor for tartrazine detection.•Electrode accuracy was verified using a juice real sample.•The sensor demonstrates satisfying performances for the detection tartrazine. In this work, we report the analytical detection of tartrazine through differential pulse voltammetry (DPV) using gold nanoparticles (AuNPs) and Nickel(II)-phthalocyanine-tetrasulfonic (NiTsPc). The Layer-by-Layer (LbL) film was constructed following the Au-(AuNPs-PAH/NiTsPc)5 architecture. The electric current characteristics of this sensor were verified by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). As a result of these measurements, a large and well-defined redox peak was obtained, indicating a significant enhancement in electron transfer. Excellent sensing performance was achieved with high sensitivity (25.79 ± 0.47 (µA cm−2) (µmol L−1)−1 and 8.80 ± 0.36 (µA cm−2) (µmol L−1)−1), low limit of detection (0.055 µmol L−1 and 0.122 µmol L−1), and excellent anti-interference and repeatability behavior. The Au electrode modified with the LbL film was also evaluated in commercially available juice samples with a recovery range from 97.74% to 108.26%.