2016
DOI: 10.1039/c6ra12148a
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Highly luminescent N-doped carbon quantum dots from lemon juice with porphyrin-like structures surrounded by graphitic network for sensing applications

Abstract: Here we demonstrate a simple, low cost, and green synthetic approach to synthesizing water-soluble, nitrogen-doped, fluorescent carbon quantum dots (NCQDs) from lemon juice and ammonia by hydrothermal treatment. Chemical characterizations and low temperature photoluminescence and photoconductivity results show interesting structural features of the as-prepared NCQDs. These new NCQDs consist of a ring type moiety (porphyrin/chlorin) in the centre surrounded by the graphitic network and serve as an efficient flu… Show more

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Cited by 63 publications
(33 citation statements)
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“…With the standard PL measurement [ 22 ], the fluorescence quantum yield of the CQDs is 16.7% with an excitation wavelength of 410 nm, where quinine sulfate had been used as the reference. This value is significantly better than the QY (8.95%) of CQDs made from lemon juice in the previous report [ 24 ]. It is known that the QY of the CQDs can be dramatically enhanced after surface modification or passivation [ 30 ].…”
Section: Resultscontrasting
confidence: 58%
See 1 more Smart Citation
“…With the standard PL measurement [ 22 ], the fluorescence quantum yield of the CQDs is 16.7% with an excitation wavelength of 410 nm, where quinine sulfate had been used as the reference. This value is significantly better than the QY (8.95%) of CQDs made from lemon juice in the previous report [ 24 ]. It is known that the QY of the CQDs can be dramatically enhanced after surface modification or passivation [ 30 ].…”
Section: Resultscontrasting
confidence: 58%
“…as carbon precursors. Our facile hydrothermal reaction is at a lower temperature (120 °C) and takes less time (3 h), compared to the reported method [ 24 ].
Fig.
…”
Section: Methodsmentioning
confidence: 99%
“…Fe 3+ has an outer electronic configuration of 4s 2 3d 5 , which means that it has five half‐filled d orbitals in the outer shell. Therefore, when they are added to the CD solution, the excited electrons from the conduction band of CD are transferred to the half‐filled 3d orbital of Fe 3+ and hence a fluorescence quenching takes place . However, when KH 2 PO 4 is added to the CD‐Fe 3+ solution, then the fluorescence property of the CD particles returns.…”
Section: Resultsmentioning
confidence: 99%
“…5%. Mondal et al used lemon juice as the precursor for the synthesis of N doped CDs, which they used as a sensing probe to detect Fe 3+ in water, and their work reports a detection limit of 140 ppb (2.5 μM). Although a considerable amount of research on the synthesis of CDs from bio‐resources has been conducted successfully, there are many more bio‐resources to be discovered for synthesizing CDs with substantial properties.…”
Section: Introductionmentioning
confidence: 99%
“…In recent years, synthesis C‐dots using hydrothermal carbonization of bio‐precursor such as glucose, orange juice, lemon juice, soy milk and egg is of particular interest to researchers because of its simple and low‐cost preparation . Despite light emission properties of lemon derived C‐dots been documented, controlling for its long‐term stability and luminescence still remain a challenge, which would be strongly dependent on the hydrothermal parameters.…”
Section: Introductionmentioning
confidence: 99%