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
AuthorsNguyen, K.G., Baragau, I-A., Gromicova, R., Nicolaev, A., Thomson, S. A J, Rennie, A., Power, N. P, Sajjad, T. and Kellici, S.
AbstractCarbon 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).]
KeywordsNitrogen - chemistry; Ammonia; Glucose; Quantum Dots - chemistry; Carbon - chemistry
Year2022
JournalScientific Reports
Journal citation12 (1), p. 13806
PublisherNature Research
ISSN2045-2322
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/ClientLondon South Bank
Institute of Atomic Physics of the National Institute of Materials Physics.
Publication dates
Print15 Aug 2022
Online15 Aug 2022
Publication process dates
Deposited22 Aug 2022
Accepted18 Jul 2022
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Kellici, S, Acord, J, Vaughn, A, Power, N, Morgan, D, Heil, T, Facq, S and Lampronti, G (2016). Calixarene Assisted Rapid Synthesis of Silver-Graphene Nanocomposites with Enhanced Antibacterial Activity. ACS applied materials & interfaces. 8 (29), pp. 19038-19046. https://doi.org/10.1021/acsami.6b06052
Controlling exciton diffusion and fullerene distribution in photovoltaic blends by side chain modification
Sajjad, T, Ward, Alexander J, Kästner, Christian, Ruseckas, Arvydas, Hoppe, Harald and Samuel, Ifor DW (2015). Controlling exciton diffusion and fullerene distribution in photovoltaic blends by side chain modification. The journal of physical chemistry letters. 6 (15), pp. 3054-3060. https://doi.org/10.1021/acs.jpclett.5b01059
Fluorescent Red-Emitting BODIPY Oligofluorene Star-Shaped Molecules as a Color Converter Material for Visible Light Communications
Sajjad, T, Manousiadis, Pavlos P, Orofino, Clara, Cortizo-Lacalle, Diego, Kanibolotsky, Alexander L, Rajbhandari, Sujan, Amarasinghe, Dimali, Chun, Hyunchae, Faulkner, Grahame and O’Brien, Dominic C (2015). Fluorescent Red-Emitting BODIPY Oligofluorene Star-Shaped Molecules as a Color Converter Material for Visible Light Communications. Advanced optical materials. 3 (4), pp. 536-540. https://doi.org/10.1002/adom.201400424
Mercaptophosphonic acids as efficient linkers in quantum dot sensitized solar cells
Aldakov, D, Sajjad, T, Ivanova, V, Bansal, AK, Park, J, Reiss, P and Samuel, IDW (2015). Mercaptophosphonic acids as efficient linkers in quantum dot sensitized solar cells. Journal of Materials Chemistry A. 3 (37), pp. 19050-19060. https://doi.org/10.1039/C5TA04021C
Novel fast color-converter for visible light communication using a blend of conjugated polymers
Sajjad, T, Manousiadis, Pavlos P, Chun, Hyunchae, Vithanage, Dimali A, Rajbhandari, Sujan, Kanibolotsky, Alexander L, Faulkner, Grahame, O’Brien, Dominic, Skabara, Peter J and Samuel, Ifor DW (2015). Novel fast color-converter for visible light communication using a blend of conjugated polymers. Acs Photonics. 2 (2), pp. 194-199. https://doi.org/10.1021/ph500451y
Photophysical and structural characterisation of in situ formed quantum dots
Bansal, AK, Antolini, F, Sajjad, T, Stroea, L, Mazzaro, R, Ramkumar, SG, Kass, K-J, Allard, S, Scherf, U and Samuel, IDW (2014). Photophysical and structural characterisation of in situ formed quantum dots. Physical Chemistry Chemical Physics. 16 (20), pp. 9556-9564. https://doi.org/https://www.doi.org/10.1039/C4CP00727A
Synthesis and properties of novel star-shaped oligofluorene conjugated systems with BODIPY cores
Orofino-Pena, Clara, Cortizo-Lacalle, Diego, Cameron, Joseph, Sajjad, T., Manousiadis, Pavlos P, Findlay, Neil J, Kanibolotsky, Alexander L, Amarasinghe, Dimali, Skabara, Peter J and Tuttle, Tell (2014). Synthesis and properties of novel star-shaped oligofluorene conjugated systems with BODIPY cores. Beilstein journal of organic chemistry. 10, pp. 2704-2714. https://doi.org/https://www.doi.org/10.3762/bjoc.10.285
Imaging the continuous hydrothermal flow synthesis of nanoparticulate CeO2 at different supercritical water temperatures using in situ angle-dispersive diffraction
Middelkoop, V, Tighe, CJ, Kellici, S, Gruar, RI, Perkins, JM, Jacques, SDM, Barnes, P and Darr, JA (2014). Imaging the continuous hydrothermal flow synthesis of nanoparticulate CeO2 at different supercritical water temperatures using in situ angle-dispersive diffraction. Journal of Supercritical Fluids. 87, pp. 118 - 128. https://doi.org/10.1016/j.supflu.2013.12.022
Optical and photocatalytic behaviours of nanoparticles in the Ti-Zn-O binary system
Goodall, JBM, Kellici, S, Illsley, D, Lines, R, Knowles, JC and Darr, JA (2014). Optical and photocatalytic behaviours of nanoparticles in the Ti-Zn-O binary system. RSC Advances. 4 (60), pp. 31799 - 31809. https://doi.org/10.1039/c3ra48030e
Measurement of a reaction-diffusion crossover in exciton-exciton recombination inside carbon nanotubes using femtosecond optical absorption
Allam, J, Sajjad, T, Sutton, R, Litvinenko, K, Wang, Zilong, Siddique, S, Yang, Q-H, Loh, Wei H and Brown, T (2013). Measurement of a reaction-diffusion crossover in exciton-exciton recombination inside carbon nanotubes using femtosecond optical absorption. Physical review letters. 111 (19), pp. 197401-197401. https://doi.org/10.1103/PhysRevLett.111.197401