A novel highly selective and sensitive detection of serotonin based on Ag/polypyrrole/Cu2O nanocomposite modified glassy carbon electrode

作者：Selvarajan S; Suganthi A^*; Rajarajan M^*

来源：Ultrasonics Sonochemistry, 2018, 44: 319-330.

DOI：10.1016/j.ultsonch.2018.02.038

• Silver
• Polyprrole
• Copper oxide
• Nanocomposites
• Cyclic voltammetry
• Differential pulse voltammetry
• Serotonin sensor

A silver/polypyrrole/copper oxide (Ag/PPy/Cu2O) ternary nanocomposite was prepared by sonochemical and oxidative polymerization simple way, in which Cu2O was decorated with Ag nanoparticles, and covered by polyprrole (PPy) layer. The as prepared materials was characterized by UV-vis-spectroscopy (UV-vis), FT-IR, Xray diffraction (XRD), thermo-gravimetric analysis (TGA), scanning electron microscopy (SEM) with EDX, high resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS). Sensing of serotonin (5HT) was evaluated electrocatalyst using polypyrrole/glassy carbon electrode (PPy/GCE), polypyrrole/copper oxide/glassy carbon electrode (PPy/Cu2O/GCE) and silver/polypyrrole/copper oxide/glassy carbon electrode (Ag/PPy/Cu2O/GCE). The Ag/PPy/Cu2O/GCE was electrochemically treated in 0.1-MPBS solution through cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The peak current response increases linearly with 5-HT concentration from 0.01 to 250 smol L-1 and the detection limit was found to be 0.0124 mu moll L-1. It exhibits high electrocatalytic activity, satisfactory repeatability, stability, fast response and good selectivity against potentially interfering species, which suggests its potential in the development of sensitive, selective, easy-operation and low-cost serotonin sensor for practical routine analyses. The proposed method is potential to expand the possible applied range of the nanocomposite material for detection of various concerned electro active substances.

• 出版日期2018-6