Fabrication of graphene-platinum nanocomposite for the direct electrochemistry and electrocatalysis of myoglobin.

Wei Sun, Linfang Li, Bingxin Lei, Tongtong Li, Xiaomei Ju, Xiuzheng Wang, Guangjiu Li, Zhenfan Sun

College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, PR China. swyy26@hotmail.com

Materials science & engineering. C, Materials for biological applications 2013 May 1

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In this paper a platinum (Pt) nanoparticle decorated graphene (GR) nanosheet was synthesized and used for the investigation on direct electrochemistry of myoglobin (Mb). By integrating GR-Pt nanocomposite with Mb on the surface of carbon ionic liquid electrode (CILE), a new electrochemical biosensor was fabricated. UV-Vis absorption and FT-IR spectra indicated that Mb remained its native structure in the nanocomposite film. Electrochemical behaviors of Nafion/Mb-GR-Pt/CILE were investigated with a pair of well-defined redox peak appeared, which indicated that direct electron transfer of Mb was realized on the underlying electrode with the usage of the GR-Pt nanocomposite. The fabricated electrode showed good electrocatalytic activity to the reduction of trichloroacetic acid in the linear range from 0.9 to 9.0 mmol/L with the detection limit as 0.32 mmol/L (3σ), which showed potential application for fabricating novel electrochemical biosensors and bioelectronic devices. Copyright © 2012 Elsevier B.V. All rights reserved.

Citation

Wei Sun, Linfang Li, Bingxin Lei, Tongtong Li, Xiaomei Ju, Xiuzheng Wang, Guangjiu Li, Zhenfan Sun. Fabrication of graphene-platinum nanocomposite for the direct electrochemistry and electrocatalysis of myoglobin. Materials science & engineering. C, Materials for biological applications. 2013 May 1;33(4):1907-13