Journal
ELECTROCHIMICA ACTA
Volume 176, Issue -, Pages 827-835Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.07.091
Keywords
Bimetallic nanoparticles; Graphene oxide; Electrochemical sensing; Vanillin
Categories
Funding
- National Natural Science Foundation of China [21171174]
- Provincial Natural Science Foundation of Hunan [09JJ3024, 13JJ3112]
- Scientific Research Project of Education Department of Hunan Province [14C0168, 13K105]
- Provincial Environmental Science and Technology Foundation of Hunan
- Opening Subjects of State Key Laboratory of Powder Metallurgy and Province Key Laboratory of Functional Metal Organic Materials [GN14K03]
- Key Discipline Project of Hunan Province
- Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
- Open-end Fund for the Valuable and Precision Instruments of Central South University
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In this work, a fascinating hybrid based on Ag-Pd bimetallic nanoparticles-decorated graphene oxide (Ag-Pd/GO) has been successfully synthesized by a green and in situ chemical reduction strategy. The resultant hybrid was particularly characterized by scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, ultraviolet-visible spectroscopy and electrochemical techniques. The morphological results illustrate that Ag-Pd nanoparticles in microspheric appearances are highly dispersed and embedded on the GO layers, resulting in a rough surface and three-dimensional (3D) microstructure with a high Ag-Pd content in the matrix. The as-synthesized 3D Ag-Pd/GO hybrid displays distinctly enhanced electrocatalytic activity for the vanillin oxidation in comparison with that of the monometal-decorated GO, revealing a synergistic effect of the matrix GO and the doped bimetallic Ag-Pd. Therefore, the Ag-Pd/GO composite can be used as an enhanced electrochemical sensing platform for the sensitive determination of vanillin, and the fabricated sensor displays a wide detection range of 0.02-45 mu mol dm(-3), low detection limit of 5 nmol dm(-3) and satisfactory recoveries between 98.8 % and 103.5 %. All the results demonstrate that the 3D hybrids integrated graphene with bimetallic nanoparticles are promising candidates for the development of high-performance electrochemical sensors. (C) 2015 Elsevier Ltd. All rights reserved.
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