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

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

Materials science & engineering. C, Materials for biological applications (2013-03-19)

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

ABSTRACT

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.

MATERIALS

Product Number

Brand

Product Description

520799

Sigma-Aldrich

Platinum black, low bulk density, ≥99.9% trace metals basis

298093

Sigma-Aldrich

Platinum, gauze, 100 mesh, 99.9% trace metals basis

267244

Sigma-Aldrich

Platinum, foil, thickness 0.025 mm, 99.9% trace metals basis

205915

Sigma-Aldrich

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349402

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Platinum, wire, diam. 0.25 mm, 99.9% trace metals basis

349348

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Platinum, foil, thickness 0.127 mm, 99.99% trace metals basis

349380

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357375

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Platinum, wire, diam. 0.076 mm, ≥99.99% trace metals basis

327484

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Platinum, shot, ≤3 mm, ≥99.9% trace metals basis

267821

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Platinum, wire, diam. 0.127 mm, 99.9% trace metals basis

520780

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Platinum black, fuel cell grade, ≥99.9% trace metals basis

349321

Sigma-Aldrich

Platinum, foil, thickness 0.25 mm, 99.99% trace metals basis

444685

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349356

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349372

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Platinum, foil, thickness 1.0 mm, 99.99% trace metals basis

349399

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298107

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373214

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267163

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Platinum, wire, diam. 0.127 mm, 99.99% trace metals basis

357359

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327433

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267228

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327492

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267260

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Sigma-Aldrich

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Sigma-Aldrich

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