Amperometric determination of dopamine Ndoped graphene/Au@Pt core-shell nanoparticles modified glassy carbon electrode

Abstract

The formation of N-doped graphene (NG) use hydrothermal method with urea as reducing agent and nitrogen source.The surface elemental composition of the catalyst was analyzed through XPS, which showed the atomic ratio of N/C is 5.0%, indicative of the effective N-doping.The Au@Pt core-shell nanoparticles were prepared by seed-mediated growth method, where tens of small Pt nanoparticles aggregated on gold seeds.Finally, the Au@ Pt core-shell nanoparticles was introduced into the interlayers of NG nanosheets to form Au@Pt/NG hybrid materials by sonication technique.The as-prepared Au@Pt/NG hybrid materials modified glassy carbon electrode (Au@Pt/NG/GCE) was first employed for the determination of DA.The DA oxidation current is linear to its concentration in the range of 6.0×10 -8 ～1.3×10 -6 M, and the detection limit was found to be 1.0×10 -8 (S/N=3).