Green synthesis of carbon dots using expired agar for a label-free fluorescence signal-amplified detection of ferric ion utilizing oxalate functionalization

Achadu, Ojodomo J. and Elizur, Gideon L. and Boye, ThankGod E. and Park, Enoch Y. (2022) Green synthesis of carbon dots using expired agar for a label-free fluorescence signal-amplified detection of ferric ion utilizing oxalate functionalization. Materials Advances, 3 (15). pp. 6307-6315. ISSN 2633-5409 (https://doi.org/10.1039/d2ma00567k)

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Abstract

Surface passivation strategies for functional carbon-based nanoparticles can provide unrivalled performance whilst fine-tuning their optical properties in addition to giving routes for large-scale syntheses. Herein, the synthesis of highly fluorescent agar-derived and oxalate-functionalized carbon dots (ag-oxCDs) is presented. We deployed a facile hydrothermal protocol, using expired potato dextrose agar and oxalate as "green" precursors to prepare fluorescent ag-oxCDs with a relative fluorescence (FL) quantum yield of ∼32% (emission/excitation wavelengths: 445/340 nm). The switchable fluorescence properties of the prepared ag-oxCDs was used for developing a sensitive nanosensor for ferric ion [Fe(iii)] detection. Through Fe(iii) coordination to the oxalate passivated surface of ag-oxCDs, the FL of ag-oxCDs was enhanced by an aggregation-induced emission enhancement mechanism. The tested and optimized concentration of Fe(iii) was within a broad linear range of 0.5-1500 μM, with a detection limit of 75 nM (s/N = 3). The practical application of the ag-oxCDs-based FL nanosensor for real-time quantitative monitoring of Fe(iii) was demonstrated by detecting up to 0.15 μM of Fe(iii) in spiked human serum and water samples.

  • Item type:Article
    ID code:82550
    Dates:
    Date
    Event
    7 August 2022
    Published
    29 June 2022
    Published Online
    29 June 2022
    Accepted
    Subjects:Science > Chemistry
    Department:UNSPECIFIED
    Depositing user: Pure Administrator
    Date deposited:04 Oct 2022 14:20
    Last modified:20 Apr 2024 00:51
    URI:https://strathprints.strath.ac.uk/id/eprint/82550
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