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

298093

Sigma-Aldrich

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

267821

Sigma-Aldrich

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

267244

Sigma-Aldrich

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

205915

Sigma-Aldrich

Platinum black, black, powder, ≤20 μm, ≥99.95% trace metals basis

444685

Sigma-Aldrich

Platinum, wire, diam. 2.0 mm, 99.9% trace metals basis

349348

Sigma-Aldrich

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

349402

Sigma-Aldrich

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

520799

Sigma-Aldrich

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

520780

Sigma-Aldrich

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

349380

Sigma-Aldrich

Platinum, foil, thickness 0.1 mm, 99.9% trace metals basis

349321

Sigma-Aldrich

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

357375

Sigma-Aldrich

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

327484

Sigma-Aldrich

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

303798

Sigma-Aldrich

Platinum, foil, thickness 0.05 mm, ≥99.9% trace metals basis

204048

Sigma-Aldrich

Platinum, powder (coarse), 99.99% trace metals basis

349399

Sigma-Aldrich

Platinum, wire, diam. 1.5 mm, ≥99.9% trace metals basis

373265

Sigma-Aldrich

Platinum, wire, diam. 0.25 mm, thermocouple grade

349364

Sigma-Aldrich

Platinum, foil, thickness 0.025 mm, 99.99% trace metals basis

327492

Sigma-Aldrich

Platinum, wire, diam. 1.0 mm, 99.9% trace metals basis

267155

Sigma-Aldrich

Platinum, sponge, ≥99.9% trace metals basis

267260

Sigma-Aldrich

Platinum, foil, thickness 0.5 mm, 99.99% trace metals basis

267228

Sigma-Aldrich

Platinum, wire, diam. 0.5 mm, 99.9% trace metals basis

204013

Sigma-Aldrich

Platinum, powder, 99.995% trace metals basis

298107

Sigma-Aldrich

Platinum, gauze, 52 mesh, 99.9% trace metals basis

373214

Sigma-Aldrich

Platinum, evaporation slug, diam. × L 0.6 cm × 1.2 cm, 99.99% trace metals basis

685453

Sigma-Aldrich

Platinum, nanopowder, <50 nm particle size (TEM)

267201

Sigma-Aldrich

Platinum, wire, diam. 0.5 mm, 99.99% trace metals basis

349372

Sigma-Aldrich

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

357367

Sigma-Aldrich

Platinum, wire, diam. 0.10 mm, 99.99% trace metals basis

327433

Sigma-Aldrich

Platinum, foil, thickness 0.125-0.135 mm, 99.9% trace metals basis