Gold Nanoparticles/Carbon Nanotubes and Gold Nanoporous as Novel Electrochemical Platforms for L-Ascorbic Acid Detection: Comparative Performance and Application

Herein, the effects of nanostructured modifications of a gold electrode surface in the development of electrochemical sensors for L-ascorbic acid detection have been investigated. In particular, a bare gold electrode has been modified by electrodeposition of gold single-walled carbon nanotubes (Au/S...

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Bibliographic Details
Published in:Chemosensors 2021-08, Vol.9 (8), p.229
Main Authors: Tortolini, Cristina, Tasca, Federico, Venneri, Mary Anna, Marchese, Cinzia, Antiochia, Riccarda
Format: Article
Language:English
Subjects:
Ammonium chloride
Ascorbic acid
Chemical sensors
electrochemical characterization
Electrochemical impedance spectroscopy
electrochemical sensor
Electrodes
Gold
L-ascorbic acid
modified electrode
Nanoparticles
nanoporous gold
Nanotubes
Oxidation
Scanning electron microscopy
Sensitivity enhancement
Sensors
Silver chloride
Single wall carbon nanotubes
single walled-carbon nanotubes
Spectroscopy
Vitamin C
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Summary:Herein, the effects of nanostructured modifications of a gold electrode surface in the development of electrochemical sensors for L-ascorbic acid detection have been investigated. In particular, a bare gold electrode has been modified by electrodeposition of gold single-walled carbon nanotubes (Au/SWCNTs) and by the formation of a highly nanoporous gold (h-nPG) film. The procedure has been realized by sweeping the potential between +0.8 V and 0 V vs. Ag/AgCl for 25 scans in a suspension containing 5 mg/mL of SWCNTs in 10 mM HAuCl4 and 2.5 M NH4Cl solution for Au/SWCNTs modified gold electrode. A similar procedure was applied for a h-nPG electrode in a 10 mM HAuCl4 solution containing 2.5 M NH4Cl, followed by applying a fixed potential of −4 V vs. Ag/AgCl for 60 s. Cyclic voltammetry and electrochemical impedance spectroscopy were used to characterize the properties of the modified electrodes. The developed sensors showed strong electrocatalytic activity towards ascorbic acid oxidation with enhanced sensitivities of 1.7 × 10−2 μA μM−1cm−2 and 2.5 × 10−2 μA μM−1cm−2 for Au/SWCNTs and h-nPG modified electrode, respectively, compared to bare gold electrode (1.0 × 10−2 μA μM−1cm−2). The detection limits were estimated to be 3.1 and 1.8 μM, respectively. The h-nPG electrode was successfully used to determine ascorbic acid in human urine with no significant interference and with satisfactory recovery levels.
ISSN:2227-9040
2227-9040
DOI:10.3390/chemosensors9080229