▎ 摘　　要

We reported on the synthesis and application of ionophore-gold nanoparticle conjugates in Ag+ graphene paste electrode. Ionophore was a novel graphene oxide nanosheets (NGO) covalently grafted 2-thiophenecarboxylic (TPC) hybrid material. The hybrid material NGO-TPC decorated with gold nanoparticles was used as both a receptor and an ion-to-electron transducer to fabricate Ag+ graphene paste electrode. The developed electrode was highly selective to Ag+ over other tested cations and exhibited an excellent Nernstian slope of 59.3 mV dec(-1) ranging from 8.4 x 10(-7) to 1.0 x 10(-) M with a detection limit of 6.3 x 10(-7) M. Moreover, it also showed a fast response time and a long lifetime. Importantly, the new method of immobilizing ligands on NGO nanosheets to construct electrode successfully solved the universal problem of the electrode components loss from ion-selective electrode. (C) 2012 Elsevier B.V. All rights reserved.