Graphene oxide reinforced core–shell structured Ag@Cu2O with tunable hierarchical morphologies and their morphology–dependent electrocatalytic properties for bio-sensing applications

Publication date: 30 July 2018
Source:Biosensors and Bioelectronics, Volume 112
Author(s): Tian Gan, Zhikai Wang, Zhaoxia Shi, Dongyun Zheng, Junyong Sun, Yanming Liu
In this study, a facile solution approach was developed for the synthesis of a series of core–shell structured Ag@Cu2O nanocrystals of various shapes including triangles, spheres, and cubes with well–defined stable heterojunctions. The electrooxidation of dopamine (DA), uric acid (UA), guanine (G), and adenine (A) using these hybrids revealed morphology–dependent sensing properties, with activities and accumulation ability following the order, triangular Ag@Cu2O > spherical Ag@Cu2O > cubic Ag@Cu2O. Further, we constructed a novel graphene oxide (GO) nanosheet–reinforced triangular Ag@Cu2O ternary hetero–nanostructure. Such a hybrid with a three–dimensional interconnected hierarchical architecture is suitable for catalysis, since it not only leads to improved interfacial electron transfer, but also readily exposes the highly catalytic Ag@Cu2O to the reactants. Therefore, more enhanced electrochemical activities were observed for the oxidation of DA, UA, G, and A. This study provides an efficient way to synthesize morphology–controlled Ag@Cu2O heterogeneous catalysts for the fabrication of potential biosensors, and also opens up attractive avenues in the design of multifunctional ternary noble metal–semiconductor–carbon hybrids.



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