Poly coated glassy carbon electrode

Fig. 2.11. Cyclic voltammograms of a poly(aniline)-coated glassy carbon electrode (deposition charge ISO mC, geometric area 0.38 cm2), recorded at 5 mV s 1 in oxygen-free 0.1 mol dm 3 citrate/phosphate buffer at pH 5 in the absence (—), and in the presence (—), of 1 mmol dm-3 NADH. Before each scan the electrode was held at -0.3 V for 3 min to ensure complete reduction of the film.

Fig. 2.17. Plots of the current at +0.1 V for a poly(aniline)/poly(vinylsulfonate)-coated glassy carbon electrode (deposition charge 150 mC, geometric area 0.38 cm2) rotated at 9 Hz in 0.1 mol dm- 1 citrate/phosphate buffer at pH 7 as a function of the NADH concentration showing the stability of the electrode response. Four replicate calibration curves recorded in succession over 4h using the same electrode are shown ( ) run 1 ( ) run 2 (A) run 3 and (O) run 4. The solid line is drawn as a guide for the eye.

Fig. 20.48 Pseudostationary current-voltage curves obtained with a poly( A -methylpyrrole) (PMPy)-coated glassy carbon electrode in a deaerated aqueous electrolyte containing I mM Ki/K4Fe(CN)6 and 0.1 M KCl. Electrodes rotated at the indicated rate.

J. Wang and R. Li, Highly stable voltammetric measurements of phenolic compounds at poly(3-methyl-thiophene)-coated glassy carbon electrodes. Anal. Chem. 6/(24) 2809 (1989). 

Mehenni H (2012) Development of an avidin sensor based on the poly(methoxy amino-p-styryl terthiophene)-coated glassy carbon electrode. Can J Chem 90(3) 271-277... 

Fig. 26.2. Amperometric immunosensors set-up using a biotinylated copolymer poly(pyrrole-biotin, pyrrole-lactitob-ionamide) coated platinum or glassy carbon electrodes and three enzymatic markers (GOX-B, PPO-B, HRP-Ab) for the detection of cholera antitoxin. (A) HRP-immunosensor, (B) GOX-B-immunosensor, (C) PPO-B-immunosensor. Mred/Mox = hydroquinone/quinone Gox = biotinylated glucose oxidase PPO — biotinylated polyphenol oxidase HRP-Ab = peroxidase-labeled IgG anti-rabbit antibody.

Fig. 2.28. Case diagram for NADH oxidation at a glassy carbon electrode coated with a poly(aniline)/poly(vinylsulfonate) film. The points are the experimental data. The surface and case boundaries have been determined from the inhibited fit parameters given in Table 2.8. The residuals are shown as a function of the concentration of NADH below the plot.

Binyamin, Chen and Heller reported that wired enzyme electrodes constituted of glassy carbon electrodes coated with poly(4-vinylpyridine) complexed with [Os(bpy)2Cl] and quarternized with 2-bromoethylamine or poly[(iV-vinylimidazole) complexed with [Os(4,4 -dimethyl-2,2 -bypyridine)2Cl] or poly(vinylpyridine) complexed with [Os(4,4 -dimethoxy-2,2 -bypyridine)2Cl] quaternized with methyl groups lost their electrocatalytic activity more rapidly in serum or saline phosphate buffer (pH 7.2) in the presence of urate and transitional metal ions such as Zn and Fe " " than in plain saline phosphate buffer (pH 7.2). It was reported that as much as two-thirds of the current is lost in 2 h in some anodes. However, when a composite membrane of cellulose acetate, Nafion, and the polyaziridine-cross-linked co-polymer of poly(4-vinyl pyridine) quaternized with bromoacetic acid was applied, the glucose sensor stability in serum was improved and maintained for at least 3 days [27,50]. 

A novel approach to data storage applications involves a glassy carbon electrode with a coating of [Ru(bipy)2(PVP)Cl]Cl, where PVP is poly-4-vinylpyridine. The rotating electrode oxidizes iron(II) at 640 mV [the polymer coating will inhibit iron(II) oxidation until ruthenium(II) centres are oxidized to ruthenium(III)]. If the electrode is irradiated, a photochemically mediated substitution of the chloro hgand by an aquo ligand will occur and, after this radiation, a more positive potential (740 mV) is required to oxidize iron(II). Thus if the electrode potential is held between 640 and 740 mV a yes / no device is possible since irradiation will eliminate the flow of current. ... 

A Thin-layer flow detector with a glassy carbon electrode coated with a film of protonated poly(4-vinylpyridine) 2.3 X KT No data 12 Aqueous solutions 1987 159 > Cl Q, 11 <... 

Chairam, S., Buddhalee, R, Amatatongchai, M. A novel hydrogen peroxide biosensor based on horseradish peroxidase immobilized on poly(aniline-co-o-aminobenzoic acid) modified glassy carbon electrode coated with chitosan film. Int. J. Electrochem. Sci. 8(8), 10250-10264 (2013)... 

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