Solvothermal assisted phosphate functionalized graphitic carbon nitride quantum dots for optical sensing of Fe ions and its thermodynamic aspects

Vashisht, Devika; Sharma, Ekta; Kaur, Manpreet; Vashisht, Aseem; Mehta, S.K.; Singh, Kulvinder

doi:10.1016/j.saa.2019.117773

Cited by 28 publications

(11 citation statements)

References 52 publications

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“…As shown in Figure S18b, the relative fluorescence of C18 after SHPP was added was recovered at least among three CNQDs. Metal ions would bond with the CNQDs via covalent bonding, 33 nonspecific interactions, 42 or surface-catalyzed energy transfer, 15 leading to the difference in PL responses of CNQDs. In this article, besides the pyridinic N and pyrrolic N combining with Fe 3+ , the fluorescence quenching may be also attributed to the nonspecific interactions between the carboxylic groups and the metal ions.…”

Section: ■ Introductionmentioning

confidence: 99%

“…For the latter route, synthetic approaches for fluorescent CNQDs are obtained from nitrogen and carbon sources. Given its inexpensive and nitrogen-rich skeleton, urea is often selected as the nitrogen source. , Sodium citrate, , citric acid, and ammonium citrate , can also be used as a carbon source to prepare CNQDs for yielding high photoluminescence (PL). For instance, the highly fluorescent CNQDs with a QY of 42% are successfully obtained using urea as the nitrogen source and sodium citrate as the carbon source .…”

Section: Introductionmentioning

confidence: 99%

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High-Quality Carbon Nitride Quantum Dots on Photoluminescence: Effect of Carbon Sources

et al. 2021

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Graphitic carbon nitride quantum dots (CNQDs) are a new class of nanomaterial with an extraordinary photoluminescent property. Here, three highly water-soluble and photoluminescent CNQDs are synthesized through a green and facile one-step hydrothermal approach, with urea as the nitrogen source and citric acid and its salts as carbon sources. The photoluminescence (PL) performance demonstrated that the fluorescence emission peak was altered by neither the structures nor the molar ratio of urea to the carbon source. Three highly luminescent CNQDs with a quantum yield of 40% were obtained when the molar ratio of urea to sodium citrate, citric acid, and ammonium citrate was 6:1, 18:1, and 18:1, which have average sizes of 4.1, 4.6, and 6.3 nm, respectively. Moreover, the possibility of using CNQDs as potential probes to determine the concentration of iron is also discussed. The results show that the as-prepared CNQDs has high selectivity for Fe3+ ions. The quenching mechanism of CNQDs by iron is connected with the nitrogen functional groups on the surface of CNQDs. Results showed valuable information about the effects of the carbon source on the PL efficiency, biocompatibility, and metal ion detection properties of CNQDs.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-Quality Carbon Nitride Quantum Dots on Photoluminescence: Effect of Carbon Sources

et al. 2021

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“…3a ). The N 1s spectrum of rGO presented two main peaks at 399.1 and 401.0 eV, which could be ascribed to pyridine N and pyrrolic N, 42 respectively ( Fig. 3b ).…”

Section: Resultsmentioning

confidence: 99%

Fabrication of recyclable reduced graphene oxide/graphitic carbon nitride quantum dot aerogel hybrids with enhanced photocatalytic activity

et al. 2021

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“…The limit of detections was 58.44 and 25.18 μM for Fe 2 + and Fe 3 + respectively. [108] Li and co-workers prepared g-CNQDs by chemical oxidation and liquid exfoliation of bulk g-C 3 N 4 for Fe 3 + detection. The response is linear in the Fe 3 + concentration range of μM, and the detection limit is 23 nM.…”

Section: Chromium Ion (Cr 6 + ) Sensingmentioning

confidence: 99%

“…Recently, Vashisht and co‐workers developed the functionalization of g‐CNQDs with phosphate for the detection of Fe 2+ and Fe 3+ . The limit of detections was 58.44 and 25.18 μM for Fe 2+ and Fe 3+ respectively [108] . Li and co‐workers prepared g‐CNQDs by chemical oxidation and liquid exfoliation of bulk g‐C 3 N 4 for Fe 3+ detection.…”

Section: Sensing Applications Of G‐c3n4mentioning

confidence: 99%

Carbon Nitride Nanomaterials: Properties, Synthetic Approaches and New Insights in Fluorescence Spectrometry for Assaying of Metal Ions, Organic and Biomolecules

Patel

Kailasa

2022

ChemistrySelect

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Recent years, carbon nitride (C3N4) nanomaterials have engraved new insights into fluorescence spectrometry for the analysis of wide variety analytes (metal ions, organic and biomolecules). This review concentrates on the properties of C3N4 nanomaterials, synthetic routes for C3N4 nanomaterials and insights in fluorescence spectrometry for the detection of various chemical species. Firstly, this review summarizes the properties (photoluminescence, electrochemical, thermal and chemical stability) of C3N4 nanostructure materials. Secondly, the recent advances on the synthetic routes for the fabrication of C3N4 nanostructures including top‐down (hydrothermal, solvothermal and exfoliation) and bottom‐up (hard and soft templet, template‐free, solvothermal, hydrothermal and microwave) are discussed. Thirdly, we describe the new insights of C3N4 nanostructures as probes for assaying of metal ions, organic and biomolecules from complex samples via fluorescence spectrometry. Finally, we have summarized the future perspectives of carbon nitride nanostructures in analytical chemistry are described.

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Solvothermal assisted phosphate functionalized graphitic carbon nitride quantum dots for optical sensing of Fe ions and its thermodynamic aspects

Cited by 28 publications

References 52 publications

High-Quality Carbon Nitride Quantum Dots on Photoluminescence: Effect of Carbon Sources

High-Quality Carbon Nitride Quantum Dots on Photoluminescence: Effect of Carbon Sources

Fabrication of recyclable reduced graphene oxide/graphitic carbon nitride quantum dot aerogel hybrids with enhanced photocatalytic activity

Carbon Nitride Nanomaterials: Properties, Synthetic Approaches and New Insights in Fluorescence Spectrometry for Assaying of Metal Ions, Organic and Biomolecules

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