title: Conjugates of graphene oxide covalently linked ligands and gold nanoparticles to construct silver ion graphene paste electrode.
abstract: 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 8.4×10(-7) to 1.0×10(-) M with a detection limit of 6.3×10(-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.
authors: Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, PR China.
authors: Chunli
authors: C
authors: Yang
authors: Yaqin
authors: Y
authors: Chai
authors: Ruo
authors: R
authors: Yuan
authors: Wenju
authors: W
authors: Xu
authors: Ting
authors: T
authors: Zhang
authors: Feng
authors: F
authors: Jia