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Carbon quantum dot coated Fe3O4 hybrid composites for sensitive electrochemical detection of uric acid
Natl Inst Biotechnol and Genet Engn, Pakistan.
Natl Inst Biotechnol and Genet Engn, Pakistan; Univ Sindh, Pakistan; Univ Bristol, England.
Shah Abdul Latif Univ, Pakistan.
Natl Inst Biotechnol and Genet Engn, Pakistan.
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2019 (English)In: Microchemical journal (Print), ISSN 0026-265X, E-ISSN 1095-9149, Vol. 146, p. 517-524Article in journal (Refereed) Published
Abstract [en]

The study explores carbon quantum dots (C-dots) as potential candidates for enhancing the signal sensitivity of an electrochemical sensor devised for biologically important molecule, such as uric acid (UA). The C-dots were evaluated for their electrochemical characteristics in combination with Fe3O4 nanoparticles (Fe3O4 NPs), which were applied as the primary electro-catalytic promoter. The hybrid nanocomposite (C-dots/Fe3O4 HCs) formation was achieved by facilitating the adsorption of C-dots over Fe3O4 NPs using amine-carbonyl interactions. Unlike, one pot method, the proposed strategy enables aggregation-free coverage of Fe3O4 NPs with highly conductive layer of C-dots that can act as conduction centres to support ultra-fast electron transfer kinetics to satisfy the need of high signal sensitivity. The hybrid composite demonstrated remarkable signal improvement when tested against the electrochemical oxidation of UA. The heighten current response and lower over-potential values enabled development of a DC-amperometric (DC-AMP) sensor for UA with a linear working range of 0.01 to 0.145 mu M and signal sensitivity measurable up to 6.0 x 10(-9) M. The said improvement was manifested as a synergetic outcome of active redox couple (Fe (III/II)), larger surface area of Fe3O4 NPs engulfed with a layer of highly conductive C-dots acting as efficient charge sensitisers.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2019. Vol. 146, p. 517-524
Keywords [en]
C-dots; Magnetite NPs; Uric acid; Electrochemical sensors
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:liu:diva-156927DOI: 10.1016/j.microc.2019.01.034ISI: 000463132100066OAI: oai:DiVA.org:liu-156927DiVA, id: diva2:1318698
Note

Funding Agencies|Scientific and Technological Research Council of Turkey (TUBITAK) [1059B211600383]

Available from: 2019-05-28 Created: 2019-05-28 Last updated: 2019-05-28

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