Electrochemical sensor for sensitive detection of triclosan based on graphene/palladium nanoparticles hybrids

In this paper, poly (diallyldimethylammonium chloride) functionalized graphene/palladium nanoparticles (PDDA-Gr/PdNPs) have been successfully synthesized through a simple one-pot method with the use of PDDA as stabilizing agents. The electrochemical response of triclosan on the PDDA-Gr/PdNPs modified glassy carbon electrode (GCE) is greatly enhanced comparing to the PDDA-Gr/GCE or the bare GCE. It is suggested that the nanocomposite exhibited good electron transfer ability and catalytic activity. Under the optimal conditions, the oxidation current increased linearly with the concentration of triclosan in the range of 9.0nM to 20.0μM. The detection limit was estimated to be 3.5nM (S/N=3). Besides, the electrochemical sensor presented superior reproducibility, excellent anti-interference performance and long-term stability. What is more, the method is promising for the determination of trace amounts of triclosan in water samples.