A novel hybrid carbon materials-modified electrochemical sensor used for detection of gallic acid

[Display omitted] •Electrical conductivity measurements were reported for new hybrid carbon materials.•Carbon Spheres (CSs)/Activated Carbon (AC)-carbon nanotubes (CNTs) shows highest electrical conductivity.•The charge transfer coefficient reveals a better electro-catalytic oxidation mechanism of g...

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Published in:	Measurement : journal of the International Measurement Confederation Vol. 187; p. 110369
Main Authors:	Terbouche, Achour, Boulahia, Soumeya, Mecerli, Sarah, Ait-Ramdane-Terbouche, Chafia, Belkhalfa, Hakim, Guerniche, Djamila, Sehailia, Moussa, Bachari, Khaldoun, Mezaoui, Djillali, Hauchard, Didier
Format:	Journal Article
Language:	English
Published:	London Elsevier Ltd 01-01-2022 Elsevier Science Ltd Elsevier
Subjects:	Activated carbon Carbon Carbon nanotubes Cavity microelectrode sensor Chemical Sciences Chemical sensors Electrical conductivity measurement Electrodes Gallic acid Gallic acid analysis Hybrid carbon materials Microelectrodes Nanotubes Oxidation Reproducibility Sensors Square waves Stability Hybrid carbon materials Gallic acid analysis Electrical conductivity measurement Cavity microelectrode sensor
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Summary:	[Display omitted] •Electrical conductivity measurements were reported for new hybrid carbon materials.•Carbon Spheres (CSs)/Activated Carbon (AC)-carbon nanotubes (CNTs) shows highest electrical conductivity.•The charge transfer coefficient reveals a better electro-catalytic oxidation mechanism of gallic acid.•The cavity microelectrode (CME) modified with CSs/AC-CNTs exhibits a lower LOD of gallic acid.•The reproducibility and stability of CME/CSs/AC-CNTs revealed that the RSD % was about 1.44 and 3.7%, respectively. Novel hybrid carbon materials such as activated carbon-carbon nanotubes (AC-CNTs) and carbon spheres/activated carbon-carbon nanotubes (CSs/AC-CNTs) based on activated carbon (AC) derived from the pits of Algerian date palm have been prepared and characterized. In addition, the carbon paste electrodes based on graphite carbon (GC) and cavity microelectrode (CME) modified with these hybrid materials were used to detect gallic acid at pH = 7 using square wave voltammetry method (SWV). The conductivity measurements revealed that CSs/AC-CNTs is more conducting than AC-CNTs. SWV measurements showed that the oxidation current was directly proportional to the concentrations of gallic acid (from 0 to 0.00536 M) with the lowest limit of detection (LOD), reaching 6.43 µM and 3.64 µM using GC/CSs/AC-CNTs electrode and CME/GC/CSs/AC-CNTs sensor, respectively. The reproducibility and the stability of the studied sensor were confirmed by the relative standard deviation of the oxidation current response of gallic acid (RSD Reproducibility = 1.44% and RSD Stability = 3.7%).
ISSN:	0263-2241 1873-412X
DOI:	10.1016/j.measurement.2021.110369