Investigating the effect of N-doping on carbon quantum dots structure, optical properties and metal ion screening.
Journal article
Nguyen, K.G., Baragau, I-A., Gromicova, R., Nicolaev, A., Thomson, S. A J, Rennie, A., Power, N. P, Sajjad, T. and Kellici, S. (2022). Investigating the effect of N-doping on carbon quantum dots structure, optical properties and metal ion screening. Scientific Reports. 12 (1), p. 13806. https://doi.org/10.1038/s41598-022-16893-x
| Authors | Nguyen, K.G., Baragau, I-A., Gromicova, R., Nicolaev, A., Thomson, S. A J, Rennie, A., Power, N. P, Sajjad, T. and Kellici, S. |
|---|---|
| Abstract | Carbon quantum dots (CQDs) derived from biomass, a suggested green approach for nanomaterial synthesis, often possess poor optical properties and have low photoluminescence quantum yield (PLQY). This study employed an environmentally friendly, cost-effective, continuous hydrothermal flow synthesis (CHFS) process to synthesise efficient nitrogen-doped carbon quantum dots (N-CQDs) from biomass precursors (glucose in the presence of ammonia). The concentrations of ammonia, as nitrogen dopant precursor, were varied to optimise the optical properties of CQDs. Optimised N-CQDs showed significant enhancement in fluorescence emission properties with a PLQY of 9.6% compared to pure glucose derived-CQDs (g-CQDs) without nitrogen doping which have PLQY of less than 1%. With stability over a pH range of pH 2 to pH 11, the N-CQDs showed excellent sensitivity as a nano-sensor for the highly toxic highly-pollutant chromium (VI), where efficient photoluminescence (PL) quenching was observed. The optimised nitrogen-doping process demonstrated effective and efficient tuning of the overall electronic structure of the N-CQDs resulting in enhanced optical properties and performance as a nano-sensor. [Abstract copyright: © 2022. The Author(s).] |
| Keywords | Nitrogen - chemistry; Ammonia; Glucose; Quantum Dots - chemistry; Carbon - chemistry |
| Year | 2022 |
| Journal | Scientific Reports |
| Journal citation | 12 (1), p. 13806 |
| Publisher | Nature Research |
| ISSN | 2045-2322 |
| Digital Object Identifier (DOI) | https://doi.org/10.1038/s41598-022-16893-x |
| Web address (URL) | https://www.nature.com/articles/s41598-022-16893-x |
| Funder/Client | London South Bank |
| Institute of Atomic Physics of the National Institute of Materials Physics. | |
| Publication dates | |
| 15 Aug 2022 | |
| Online | 15 Aug 2022 |
| Publication process dates | |
| Deposited | 22 Aug 2022 |
| Accepted | 18 Jul 2022 |
| Publisher's version | License File Access Level Open |
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