Au nanocorals are grown on gold screen-printed electrodes (SPEs) by using a novel and simple one-step electrodeposition process. Scanning electron microscopy was used for the morphological characterization. The devices were assembled on a three-electrode SPE system, which is flexible and mass producible. The electroactive surface area, determined by cyclic voltammetry in sulphuric acid, was found to be 0.07 ± 0.01 cm2 and 35.3 ± 2.7 cm2 for bare Au and nanocoral Au, respectively. The nanocoral modified SPEs were used to develop an enzymatic glucose biosensor based on H2O2 detection. Au nanocoral electrodes showed a higher sensitivity of 48.3 ± 0.9 μA/(mM cm2) at + 0.45 V vs Ag | AgCl compared to a value of 24.6 ± 1.3 μA/(mM cm2) at + 0.70 V vs Ag | AgCl obtained with bare Au electrodes. However, the modified electrodes have indeed proven to be extremely powerful for the direct detection of glucose with a non-enzymatic approach. The results confirmed a clear peak observed by using nanocoral Au electrode even in the presence of chloride ions at physiological concentration. Amperometric study carried out at + 0.15 V vs Ag | AgCl in the presence of 0.12 M NaCl showed a linear range for glucose between 0.1 and 13 mM.

Bubble electrodeposition of gold porous nanocorals for the enzymatic and non-enzymatic detection of glucose / Sanzo', Gabriella; Taurino, Irene; Antiochia, Riccarda; Gorton, LO GUNNAR OTTO; Favero, Gabriele; Mazzei, Franco; De Micheli, Giovanni; Carrara, Sandro. - In: BIOELECTROCHEMISTRY. - ISSN 1567-5394. - STAMPA. - 112:(2016), pp. 125-131. [10.1016/j.bioelechem.2016.02.012]

Bubble electrodeposition of gold porous nanocorals for the enzymatic and non-enzymatic detection of glucose

SANZO', GABRIELLA
;
ANTIOCHIA, RICCARDA
;
GORTON, LO GUNNAR OTTO;FAVERO, Gabriele;MAZZEI, Franco;
2016

Abstract

Au nanocorals are grown on gold screen-printed electrodes (SPEs) by using a novel and simple one-step electrodeposition process. Scanning electron microscopy was used for the morphological characterization. The devices were assembled on a three-electrode SPE system, which is flexible and mass producible. The electroactive surface area, determined by cyclic voltammetry in sulphuric acid, was found to be 0.07 ± 0.01 cm2 and 35.3 ± 2.7 cm2 for bare Au and nanocoral Au, respectively. The nanocoral modified SPEs were used to develop an enzymatic glucose biosensor based on H2O2 detection. Au nanocoral electrodes showed a higher sensitivity of 48.3 ± 0.9 μA/(mM cm2) at + 0.45 V vs Ag | AgCl compared to a value of 24.6 ± 1.3 μA/(mM cm2) at + 0.70 V vs Ag | AgCl obtained with bare Au electrodes. However, the modified electrodes have indeed proven to be extremely powerful for the direct detection of glucose with a non-enzymatic approach. The results confirmed a clear peak observed by using nanocoral Au electrode even in the presence of chloride ions at physiological concentration. Amperometric study carried out at + 0.15 V vs Ag | AgCl in the presence of 0.12 M NaCl showed a linear range for glucose between 0.1 and 13 mM.
2016
electroactive surface area; glucose oxidase; glucose oxidation; gold nanocorals; hydrogen template electrodeposition; potassium ferricyanide; biophysics; electrochemistry; physical and theoretical chemistry
01 Pubblicazione su rivista::01a Articolo in rivista
Bubble electrodeposition of gold porous nanocorals for the enzymatic and non-enzymatic detection of glucose / Sanzo', Gabriella; Taurino, Irene; Antiochia, Riccarda; Gorton, LO GUNNAR OTTO; Favero, Gabriele; Mazzei, Franco; De Micheli, Giovanni; Carrara, Sandro. - In: BIOELECTROCHEMISTRY. - ISSN 1567-5394. - STAMPA. - 112:(2016), pp. 125-131. [10.1016/j.bioelechem.2016.02.012]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/904458
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