Journal
BIOSENSORS & BIOELECTRONICS
Volume 112, Issue -, Pages 23-30Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2018.04.029
Keywords
Graphene oxide; Ag; Cu2O; Biomolecules; Morphology-dependent; Electrochemical sensor
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Funding
- National Natural Science Foundation of China [61201091]
- Program for Science & Technology Innovation Talents in University of Henan Province [16HASITT004]
- Key Scientific and Technological Project of Henan Province [162102210126, 182102310689]
- Key Scientific Research Projects in University of Henan Province [18A150047]
- Plan for Scientific Innovation Talent of Henan Province [2017JR0016]
- Hubei Key Laboratory of Medical Information Analysis and Tumor Diagnosis Treatment [PJS140011709]
- Nanhu Scholars Program for Young Scholars of XYNU
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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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