Cu(0) nanoparticle-decorated functionalized reduced graphene oxide sheets as artificial peroxidase enzymes: application for colorimetric detection of Cr( vi ) ions

Graphene oxide (GO) sheets were functionalized by a “click” chemistry approach using azide modified GO and alkynyl-terminated d (+)-glucose precursors to produce glucose terminated hydrophilic GO surfaces. This hydrophilic functionalized GO surface was utilized for the decoration of Cu(0) nanopartic...

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Bibliographic Details
Published in:New journal of chemistry 2019-01, Vol.43 (3), p.1404-1414
Main Authors: Borthakur, Priyakshree, Boruah, Purna K., Das, Manash R., Szunerits, Sabine, Boukherroub, Rabah
Format: Article
Language:English
Subjects:
Analytical chemistry
Catalysis
Chemical Sciences
Colorimetry
Glucose
Graphene
Hydrogen peroxide
Hydrophilicity
Hydroxyl radicals
Nanocomposites
Nanoparticles
Organic chemistry
Oxidation
Peroxidase
Sheets
Substrates
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Summary:Graphene oxide (GO) sheets were functionalized by a “click” chemistry approach using azide modified GO and alkynyl-terminated d (+)-glucose precursors to produce glucose terminated hydrophilic GO surfaces. This hydrophilic functionalized GO surface was utilized for the decoration of Cu(0) nanoparticles for sensitive colorimetric detection of Cr( vi ) ions, which has not been explored to date. The nanocomposite exhibited excellent peroxidase mimic activity towards the colourless chromogenic substance, 3,3′,5,5′-tetramethylbenzidine (TMB), to yield a blue coloured substance 3,3′,5,5′-tetramethylbenzidinediimmine (TMBDI). In an acidic medium, Cr( vi ) can decompose H 2 O 2 to molecular O 2 and H 2 O. Both O 2 and H 2 O can form hydroxyl radicals (˙OH) by combining with the electron of the peroxidase substrate, resulting in enhanced TMB oxidation in the presence of Cr( vi ). This colorimetric method was highly selective towards Cr( vi ) ions with a limit of detection (LOD) of 67.13 nM.
ISSN:1144-0546
1369-9261
DOI:10.1039/C8NJ05363D