期刊
ELECTROCHIMICA ACTA
卷 152, 期 -, 页码 146-154出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.11.115
关键词
Graphene; Single-walled carbon nanotubes; Layered double hydroxide; Au nanoparticles; Non-enzymatic glucose sensor
资金
- 973 Program [2011CBA00506]
- National Natural Science Foundation of China, Program for Beijing Engineering Center for Hierarchical Catalysts
- Fundamental Research Funds for the Central Universities [YS1406]
A novel highly sensitive non-enzymatic glucose sensor was constructed based on gold nanoparticles decorated ternary Ni-Al layered double hydroxide/single-walled carbon nanotubes/graphene nanocomposite (Au/LDH-CNTs-G). The materials were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectra and Raman spectra, and the sensing performance was investigated by electrochemical impedance spectroscopy, cyclic voltammetry and amperometric response. The results revealed that Au/LDH-CNTs-G nanocomposite modified glassy carbon electrode exhibited remarkable electrocatalytic performance toward glucose oxidation, with a wide linear range from 10 mu M to 6.1 mM, a high sensitivity of similar to 1989 mu A.mM(-1).cm(-2) and a low detection limit of 1.0 mu M based on a signal to noise ratio of 3, which was mainly attributed to the combined effects of enhanced electrical conductivity originating from three-dimensional intertwined CNTs-graphene network, good accessibility to active reaction sites from NiAl-LDH and more electron transfer passages provided by Au nanoparticles highly dispersed on the surface. What's more, as-constructed non-enzymatic sensor showed good reproducibility, repeatability, stability and anti-interference property, and was also used to practically analyze glucose concentration in human serum samples. (C) 2014 Elsevier Ltd. All rights reserved.
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