The Preparation of Ag Nanoparticles/Graphene Nanocomposites with Polydopamine as Coupling Agent for Enhanced Detection of H2O2

In this paper, a new Ag nanoparticles (AgNPs)/graphene nanocomposites with polydopamine (PDA) as coupling agent was electrochemically synthesized and has been used as electrode modifications for the electrochemical detection of H 2 O 2 . The structural characterizations clearly showed that small sized and highly dispersed AgNPs were electrodeposited on reduced graphene oxide (RGO) with the help of PDA agent. The obtained AgNPs/PDA/RGO nanocomposites exhibited higher electrocatalytic activities toward reduction of H 2 O 2 compared with the AgNPs/RGO composites without involvement of PDA. The AgNPs/PDA/RGO nanocomposites presented excellent electrochemical sensing performance for detection of H 2 O 2 with wide linear concentration range, high detection sensitivity, good selectivity and excellent reprodutibility and stability. The successful application of AgNPs/PDA/RGO nanocomposites in human serum samples for the detection of H 2 O 2 was also demonstrated.