Journal
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 58, Issue -, Pages 450-457Publisher
ELSEVIER
DOI: 10.1016/j.msec.2015.08.049
Keywords
Three-dimensional graphene; Gold nanoparticle; Myoglobin; Direct electrochemistry; Electrocatalysis
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Funding
- National Natural Science Foundation of China [21365010]
- Natural Science Foundation of Shandong Province [ZR2013BM014]
- Nature Science Foundation of Hainan Province [20152016]
- International Science and Technology Cooperation Project of Hainan Province [KJHZ2015-13]
- Undergraduate Training Programs for Innovation and Entrepreneurship of Hainan Province
- Hainan Normal University
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In this paper a three-dimensional (3D) reduced graphene oxide (RGO) and gold (Au) composite was synthesized by electrodeposition and used for the electrode modification with carbon ionic liquid electrode (CILE) as the substrate electrode. Myoglobin (Mb) was further immobilized on the surface of 3D RGO-Au/CILE to obtain an electrochemical sensing platform. Direct electrochemistry of Mb on the modified electrode was investigated with a pair of well-defined redox waves appeared on cyclic voltammogram, indicating the realization of direct electron transfer of Mb with the modified electrode. The results can be ascribed to the presence of highly conductive 3D RGO-Au composite on the electrode surface that accelerate the electron transfer rate between the electroactive center of Mb and the electrode. The Mb modified electrode showed excellent electrocatalytic activity to the reduction of trichloroacetic acid in the concentration range from 0.2 to 36.0 mmol/L with the detection limit of 0.06 mmol/L (3 sigma). (C) 2015 Elsevier B.V. All rights reserved.
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