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

Ojodomo J. Achadu, Gideon L. Elizur, Thank God E. Boye, Enoch Y. Park

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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.

Original languageEnglish
Pages (from-to)6307-6315
Number of pages9
JournalMaterials Advances
Volume3
Issue number15
DOIs
Publication statusPublished - 29 Jun 2022

Bibliographical note

Funding Information:
The Japan Society for the promotion of Science (JSPS) is gratefully acknowledged for the funding (Grant No. P19348) to carry out part of the research work. Funding from the European Union's Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No. 945380 is gratefully acknowledged.

Publisher Copyright:
© 2022 The Author(s).

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