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

Publication year: 2020
Authors: de Lima L. 1, Maciel C. 2, Ferreira A. 1, de Almeida J. 2, Ferreira M. 1*
1 - Center of Science and Technology for Sustainability (CCTS), Federal University of São Carlos (UFSCar), CEP 18052-780, Sorocaba, SP, Brazil
2 - Sao Paulo State University Julio de Mesquita Filho(UNESP), Sorocaba, SP, Brazil
Published in: Materials Letters, 2020 Vol. 262, p. 127186
doi: 10.1016/j.matlet.2019.127186

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%.

MP-SPR keywords: azo dye detection, biosensors, food additives, food safety, gold nanoparticles, layer-by-layer (LbL), nickel complex, polymer, tartrazine