Chitosan and κ-carrageenan-derived nitrogen and sulfur co-doped carbon dots “on-off-on” fluorescent probe for sequential detection of Fe3+ and ascorbic acid

Xu, Jiyao; Wang, Yesheng; Sun, Lili; Qi, Quan; Zhao, Xia

doi:10.1016/j.ijbiomac.2021.09.165

Cited by 47 publications

(21 citation statements)

References 43 publications

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“…Furthermore, heteroatom doping can effectively improve the fluorescence performance of CDs (Jana et al, 2019). Notably, nitrogen has a similar size and structure to carbon, and its lone pair electrons easily bond to carbon-based materials, thus remarkably improving the optical properties of CDs (Sun et al, 2021;Xu et al, 2021;Wang et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

One-step synthesis of highly fluorescent carbon dots as fluorescence sensors for the parallel detection of cadmium and mercury ions

Tan

Wang

et al. 2022

Front. Chem.

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Cadmium (Cd2+) and mercury ions (Hg2+) are essential for the quality control of food samples because of their serious toxicity to human health, but the effective and simple strategy for their parallel detection remains challenging. In this paper, a rapid and simple parallel detection method for Cd2+ and Hg2+ was developed using carbon dots (CDs) as fluorescent sensors. A one-step hydrothermal method with a single precursor l-arginine as both the carbon and nitrogen sources was employed to prepare nitrogen-doped CDs (N-CDs). N-CDs exhibited a uniform particle size and excitation-independent fluorescence emission. The maximum emission wavelength of N-CDs was observed at 354 nm with the excitation wavelength at 295 nm. The quantum yield of N-CDs reached as high as 71.6% in water. By using sodium diphosphate and phytic acid as masking agents, the fluorescent sensor can be quenched by Cd2+ and Hg2+ in the linear range of 0–26.8 μM and 0–49.9 μM within 5 min. Other common ions in farm products showed no significant effect on the fluorescence intensity of the sensing system. The results demonstrated that the sensing system had good selectivity and sensitivity for Cd2+ and Hg2+. The detection limits for Cd2+ and Hg2+ were 0.20 and 0.188 μM, respectively. In addition, the fluorescent sensor had been successfully applied for the detection of Cd2+ and Hg2+ in fruits and vegetables, and the recoveries were 86.44–109.40% and 86.62–115.32%, respectively. The proposed fluorescent sensor provides a rapid, simple, and sensitive detection method for Cd2+ and Hg2+ in food samples and thus a novel quantitative detection method for heavy metal ions in foods.

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Section: Introductionmentioning

confidence: 99%

One-step synthesis of highly fluorescent carbon dots as fluorescence sensors for the parallel detection of cadmium and mercury ions

Tan

Wang

et al. 2022

Front. Chem.

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“…35 Xu et al used chitosan and κ-carrageenan to synthesize nitrogen and sulfur codoped carbon dots for the detection of Fe 3+ and ascorbic acid. 36 Herein, a novel nitrogen and sulfur codoped carbon quantum dot (N,S-CQD) fluorescent sensor was constructed in this study using α-methacrylic acid as the carbon source and L-cysteine as the nitrogen and sulfur source for the detection of Fe 3+ , H 2 S, pH, and temperature (Scheme 1). The synthesized N,S-CQDs containing imine groups (−RC�N−) had strong complexation ability and provided good conditions for the binding of metal ions.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Zhao et al developed nitrogen-doped carbon dots via hydrothermal heating of citric acid and urea for the fast detection of glucose and pH . Xu et al used chitosan and κ-carrageenan to synthesize nitrogen and sulfur codoped carbon dots for the detection of Fe 3+ and ascorbic acid …”

Section: Introductionmentioning

confidence: 99%

Temperature- and pH-Sensitive Nitrogen and Sulfur Codoped Carbon Quantum Dots for Sequential Detection of Fe³⁺ and H₂S

Yuan

Liang³

et al. 2022

ACS Appl. Nano Mater.

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In this study, nitrogen and sulfur codoped carbon quantum dot (N,S-CQD) fluorescent nanoprobes were synthesized through a one-step hydrothermal method using l-cysteine and α-methacrylic acid as raw materials, and an “on–off–on” fluorescence mechanism was designed using N,S-CQDs for sequential determination of Fe3+ and H2S in human serum. The quenching process (on–off) and mechanism of N,S-CQDs by Fe3+ were studied via fluorescence spectroscopy, zeta potential, cyclic voltammetry, and orbital energy level simulation. Meanwhile, an “off–on” strategy for the N,S-CQD/Fe3+ fluorescence sensing platform was constructed for the determination of the H2S-based “on–off” mechanism. This study not only achieved highly selective detection of Fe3+ and H2S over a wide concentration range of 0–250, 250–500, and 2.5–900 μM, respectively, but also improved our understanding on the specific identifications between N,S-CQDs, Fe3+, and H2S. What is more, it was found that N,S-CQDs also possessed pH and temperature sensing performance. Finally, N,S-CQD fluorescent nanoprobes were successfully applied for the determination of Fe3+ and H2S in spiked serum samples, which also proved their potential application in medical diagnosis and biosensors.

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“…The calculated d-spacing value of the NN-CDs was 0.36 nm, which was greater than that of a standard graphene interlayer spacing (0.34 nm, d-spacing), along with the broadness character. The larger interlayer spacing and peak broadening were associated with an amorphous carbon phase and a moderately graphitized structure [ 37 ]. The higher interlayer spacing might also have been due to the presence of various functional groups on the surface and the edges of the prepared NN-CDs [ 38 ].…”

Section: Resultsmentioning

confidence: 99%

Natural Nitrogen-Doped Carbon Dots Obtained from Hydrothermal Carbonization of Chebulic Myrobalan and Their Sensing Ability toward Heavy Metal Ions

Atchudan

Perumal

Edison

et al. 2023

Sensors

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Chebulic Myrobalan is the main ingredient in the Ayurvedic formulation Triphala, which is used for kidney and liver dysfunctions. Herein, natural nitrogen-doped carbon dots (NN-CDs) were prepared from the hydrothermal carbonization of Chebulic Myrobalan and were demonstrated to sense heavy metal ions in an aqueous medium. Briefly, the NN-CDs were developed from Chebulic Myrobalan by a single-step hydrothermal carbonization approach under a mild temperature (200 °C) without any capping and passivation agents. They were then thoroughly characterized to confirm their structural and optical properties. The resulting NN-CDs had small particles (average diameter: 2.5 ± 0.5 nm) with a narrow size distribution (1–4 nm) and a relatable degree of graphitization. They possessed bright and durable fluorescence with excitation-dependent emission behaviors. Further, the as-synthesized NN-CDs were a good fluorometric sensor for the detection of heavy metal ions in an aqueous medium. The NN-CDs showed sensitive and selective sensing platforms for Fe3+ ions; the detection limit was calculated to be 0.86 μM in the dynamic range of 5–25 μM of the ferric (Fe3+) ion concentration. Moreover, these NN-CDs could expand their application as a potential candidate for biomedical applications and offer a new method of hydrothermally carbonizing waste biomass.

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Chitosan and κ-carrageenan-derived nitrogen and sulfur co-doped carbon dots “on-off-on” fluorescent probe for sequential detection of Fe3+ and ascorbic acid

Cited by 47 publications

References 43 publications

One-step synthesis of highly fluorescent carbon dots as fluorescence sensors for the parallel detection of cadmium and mercury ions

One-step synthesis of highly fluorescent carbon dots as fluorescence sensors for the parallel detection of cadmium and mercury ions

Temperature- and pH-Sensitive Nitrogen and Sulfur Codoped Carbon Quantum Dots for Sequential Detection of Fe³⁺ and H₂S

Natural Nitrogen-Doped Carbon Dots Obtained from Hydrothermal Carbonization of Chebulic Myrobalan and Their Sensing Ability toward Heavy Metal Ions

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Chitosan and κ-carrageenan-derived nitrogen and sulfur co-doped carbon dots “on-off-on” fluorescent probe for sequential detection of Fe3+ and ascorbic acid

Cited by 47 publications

References 43 publications

One-step synthesis of highly fluorescent carbon dots as fluorescence sensors for the parallel detection of cadmium and mercury ions

One-step synthesis of highly fluorescent carbon dots as fluorescence sensors for the parallel detection of cadmium and mercury ions

Temperature- and pH-Sensitive Nitrogen and Sulfur Codoped Carbon Quantum Dots for Sequential Detection of Fe3+ and H2S

Natural Nitrogen-Doped Carbon Dots Obtained from Hydrothermal Carbonization of Chebulic Myrobalan and Their Sensing Ability toward Heavy Metal Ions

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Temperature- and pH-Sensitive Nitrogen and Sulfur Codoped Carbon Quantum Dots for Sequential Detection of Fe³⁺ and H₂S