The importance of surface states in N-doped carbon quantum dots

Dsouza, Slavia Deeksha; Buerkle, Marius; Brunet, Paul; Maddi, Chiranjeevi; Padmanaban, Dilli Babu; Morelli, Alessio; Payam, Amir Farokh; Maguire, Paul; Mariotti, Davide; Švrček, Vladimír

doi:10.1016/j.carbon.2021.06.088

Cited by 94 publications

(49 citation statements)

References 85 publications

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“… 18 Third, the doping atoms that originate from the precursors and the configuration of their bonds with carbon atoms. 19 The experimental conditions may lead to one of these pathways, selectively enabling control of the PL properties of the CNPs. Therefore, in this work, we developed solid-state CNPs by microwave heating and elucidated the emission pathways of the as-synthesized CNPs based on experimental and time-dependent density functional theory (TD-DFT) studies.…”

Section: Introductionmentioning

confidence: 99%

Solid-state nitrogen-doped carbon nanoparticles with tunable emission prepared by a microwave-assisted method

et al. 2021

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Section: Introductionmentioning

confidence: 99%

Solid-state nitrogen-doped carbon nanoparticles with tunable emission prepared by a microwave-assisted method

et al. 2021

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“…In addition, the CQDs synthesised from biomass or biomass waste, commonly possess poor optical properties and a low PLQY. The doping of heteroatom such as (N, P, S) is one of the most common methods to improve the optical properties of biomass-derived CQDs 6 , 7 . However, the questions related to the origin of the optical improvement with optimised dosing of these heteroatoms still need to be answered.…”

Section: Introductionmentioning

confidence: 99%

Investigating the effect of N-doping on carbon quantum dots structure, optical properties and metal ion screening

Nguyen

Bărăgău

Gromicova

et al. 2022

Sci Rep

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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.

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“…4(c and f)) showed four distinct peaks. Among them, the peak located at 284.6 eV could be attributed to CQC/C-C, 51,52 Fig. 2 while the peak located at 285.4 eV was attributed to C-N, 53,54 the peak at 287.5 eV to C-O, 53,54 and the peak at 288.6 eV to -CQO.…”

Section: Synthesis and Optical Properties Of The C-dotsmentioning

confidence: 99%