Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 222, Issue -, Pages 632-637Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.08.100
Keywords
Metal-organic frameworks; Nitrite; Electrochemical sensor; Au microspheres
Funding
- National Science Foundation of China [21405005, U1404208, 21301009, 21301010]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
- Project of Science and Technology Department of Henan Province [122102310521, 122102210460, 142102210586]
- Foundation of Henan Educational Committee [15A150002, 15A150031, 13B150893]
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A stable 3-dimensional (3D) Cu-based metal organic framework (Cu-MOP) was synthesized by a simple solvothermal synthesis and studied with respect to its role in the electro-oxidation of nitrite. As a novel electrode material, the Cu-MOF modified carbon paste electrode (CPE) decreases the oxidation potential of nitrite, which presented a new platform for oxidation of nitrite. It was also found that Cu-MOF exhibited strong absorption property for HAuCl4, and uniform Au microspheres were easily loaded on the surface of the MOF by absorption and electro-reduction (Au/Cu-MOF/CPE). The EDX mapping results showed that Au microspheres were anchored on the surface of Cu-MOF. The resulting Au microspheres accelerated the electron transfer rate of electrochemical reaction, and further decreased the oxidation potential of nitrite. The prepared Au/Cu-MOF/CPE demonstrated low detection limit, wide linear range, and good stability for the determination of nitrite. The results indicated that Cu-MOF would be a promising material to construct novel electrochemical sensor. (C) 2015 Elsevier B.V. All rights reserved.
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