Design of Nanostructured Hybrid Electrodes Based on a Liquid Crystalline Zn(II) Coordination Complex-Carbon Nanotubes Composition for the Specific Electrochemical Sensing of Uric Acid

A metallomesogen based on an Zn(II) coordination complex was employed as precursor to obtain a complex matrix nanoplatform for the fabrication of a high-performance electrochemical hybrid sensor. Three representative paste electrodes, which differ by the weight ratio between Zn(II) metallomesogen an...

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Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2022-11, Vol.12 (23), p.4215
Main Authors: Negrea, Sorina, Andelescu, Adelina A, Ilies B Motoc, Sorina, Cretu, Carmen, Cseh, Liliana, Rastei, Mircea, Donnio, Bertrand, Szerb, Elisabeta I, Manea, Florica
Format: Article
Language:English
Subjects:
Amperometry
Analytical chemistry
Carbon
Carbon nanotubes
Chemical Sciences
Composition
Cooling
Coordination compounds
Dopamine
Electric properties
Electrical measurement
Electrochemical analysis
Electrochemistry
Electrodes
Fabrication
Ligands
Liquid crystals
Material chemistry
metallomesogen
nanocomposite paste electrode
Nanotechnology
Nanotubes
Other
Oxidation
Phase transitions
sensor
Solvents
Uric acid
Voltammetry
Zinc
Zn(II)
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Summary:A metallomesogen based on an Zn(II) coordination complex was employed as precursor to obtain a complex matrix nanoplatform for the fabrication of a high-performance electrochemical hybrid sensor. Three representative paste electrodes, which differ by the weight ratio between Zn(II) metallomesogen and carbon nanotubes (CNT), i.e., PE_01, PE_02 and PE_03, were obtained by mixing the materials in different amounts. The composition with the largest amount of CNT with respect to Zn complex, i.e., PE_03, gives the best electrochemical signal for uric acid detection by cyclic voltammetry in an alkaline medium. The amphiphilic structure of the Zn(II) coordination complex likely induces a regular separation between the metal centers favoring the redox system through their reduction, followed by stripping, and is characterized by enhanced electrocatalytic activity towards uric acid oxidation. The comparative detection of uric acid between the PE_03 paste electrode and the commercial zinc electrode demonstrated the superiority of the former, and its great potential for the development of advanced electrochemical detection of uric acid. Advanced electrochemical techniques, such as differential-pulsed voltammetry (DPV) and square-wave voltammetry (SWV), allowed for the highly sensitive detection of uric acid in aqueous alkaline solutions. In addition, a good and fast amperometric signal for uric acid detection was achieved by multiple-pulsed amperometry, which was validated by urine analysis.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano12234215