Novel synthesis of high-thermal stability carbon dots and nanocomposites from oleic acid as an organic substrate

Rimal, Vishal; Shishodia, Shubham; Srivastava, Priyanka

doi:10.1007/s13204-019-01178-z

Cited by 42 publications

(25 citation statements)

References 10 publications

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“…Two strong Phen absorption peaks at 291 nm and 324 nm were observed clearly, ascribed to the π→π * transition and n →π * transition [ 33 ]. The ligand oleic acid has only one peak at 286 nm, which is ascribed to a n –π transition [ 34 ]. The Phen absorption peak red-shifts about 2 nm after complexing with Eu 3+ , indicating the coordination between Eu 3+ ions with N atoms in Phen [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

“…The Phen absorption peak red-shifts about 2 nm after complexing with Eu 3+ , indicating the coordination between Eu 3+ ions with N atoms in Phen [ 35 ]. The UV absorption intensity of oleic acid is very low, but the addition of carboxyl groups and hydrophobic tails will change the spatial structure of the complexes, potentially improving the stability of the complexes [ 34 ].…”

Section: Resultsmentioning

confidence: 99%

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Stable Fluorescence of Eu3+ Complex Nanostructures Beneath a Protein Skin for Potential Biometric Recognition

et al. 2021

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We designed and realized highly fluorescent nanostructures composed of Eu3+ complexes under a protein coating. The nanostructured material, confirmed by photo-induced force microscopy (PiFM), includes a bottom fluorescent layer and an upper protein layer. The bottom fluorescent layer includes Eu3+ that is coordinated by 1,10-phenanthroline (Phen) and oleic acid (O). The complete complexes (OEu3+Phen) formed higher-order structures with diameter 40–150 nm. Distinctive nanoscale striations reminiscent of fingerprints were observed with a high-resolution transmission electron microscope (HRTEM). Stable fluorescence was increased by the addition of Eu3+ coordinated by Phen and 2-thenoyltrifluoroacetone (TTA), and confirmed by fluorescence spectroscopy. A satisfactory result was the observation of red Eu3+ complex emission through a protein coating layer with a fluorescence microscope. Lanthanide nanostructures of these types might ultimately prove useful for biometric applications in the context of human and non-human tissues. The significant innovations of this work include: (1) the structural set-up of the fluorescence image embedded under protein “skin”; and (2) dual confirmations of nanotopography and unique nanofingerprints under PiFM and under TEM, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Stable Fluorescence of Eu3+ Complex Nanostructures Beneath a Protein Skin for Potential Biometric Recognition

et al. 2021

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“…Although CDs from natural products have various prominent advantages, as mentioned above, they usually need more time for pretreatment and have low quantum yields (QYs) compared to those derived from synthetic products. Some synthetic products have also been used to prepare CDs before incorporating them with polymers, such as citric acid [63], glucose [64], oleic acid [65], ethanolamine [66], and several others. Furthermore, several polymer precursors have been utilized to prepare CD/polymer composites, including natural precursors such as chitosan [67], cellulose acetate [65], and alginate [68] and synthetic precursors such as APTES [69], polyethersulfone [70], polyethyleneimine [71], polydopamine [72], polystyrene [73], polyvinyl alcohol [74], and many others.…”

Section: Precursors For Cd/polymer Compositesmentioning

confidence: 99%

“…Some synthetic products have also been used to prepare CDs before incorporating them with polymers, such as citric acid [63], glucose [64], oleic acid [65], ethanolamine [66], and several others. Furthermore, several polymer precursors have been utilized to prepare CD/polymer composites, including natural precursors such as chitosan [67], cellulose acetate [65], and alginate [68] and synthetic precursors such as APTES [69], polyethersulfone [70], polyethyleneimine [71], polydopamine [72], polystyrene [73], polyvinyl alcohol [74], and many others. Some of these are functional monomers used to produce polymers during the polymerization process with CDs.…”

Section: Precursors For Cd/polymer Compositesmentioning

confidence: 99%

“…Afterward, the films were directly immersed in a water bath to thicken and produce the membranes. Finally, they were stored in water overnight, dried at 25 °C, cut off, and immersed in water for 12 h. Moreover, Rimal, Shishodia, and Srivastava produced CDs from oleic acid, and the CDs were incorporated in a cellulose acetate polymer matrix to obtain a composite [65]. The procedure involved the pyrolysis method.…”

Section: Pyrolysis/thermal Decompositionmentioning

confidence: 99%

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Carbon Dot/Polymer Composites with Various Precursors and Their Sensing Applications: A Review

et al. 2021

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Carbon dots (CDs) have generated much interest because of their significant fluorescence (FL) properties, extraordinary photophysical attributes, and long-term colloidal stability. CDs have been regarded as a prospective carbon nanomaterial for various sensing applications because of their low toxicity, strong and broad optical absorption, high chemical stability, rapid transfer properties, and easy modification. To improve their functionality, CD/polymer composites have been developed by integrating polymers into CDs. CD/polymer composites have diversified because of their easy preparation and applications in sensing, optoelectronics, semiconductors, molecular delivery, and various commercial fields. Many review articles are available regarding the preparation and applications of CDs. Some review articles describing the production and multiple applications of the composites are available. However, no such article has focused on the types of precursors, optical properties, coating characteristics, and specific sensing applications of CD/polymer composites. This review aimed to highlight and summarize the current progress of CD/polymer composites in the last five years (2017–2021). First, we overview the precursors used for deriving CDs and CD/polymer composites, synthesis methods for preparing CDs and CD/polymer composites, and the optical properties (absorbance, FL, emission color, and quantum yield) and coating characteristics of the composites. Most carbon and polymer precursors were dominated by synthetic precursors, with citric acid and polyvinyl alcohol widely utilized as carbon and polymer precursors, respectively. Hydrothermal treatment for CDs and interfacial polymerization for CDs/polymers were frequently performed. The optical properties of CDs and CD/polymer composites were almost identical, denoting that the optical characters of CDs were well-maintained in the composites. Then, the chemical, biological, and physical sensing applications of CD/polymer composites are categorized and discussed. The CD/polymer composites showed good performance as chemical, biological, and physical sensors for numerous targets based on FL quenching efficiency. Finally, remaining challenges and future perspectives for CD/polymer composites are provided.

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Nanocomposites Based on Polymer Blends and CNT

Tyagi

Devnani

2022

Handbook of Carbon Nanotubes

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Novel synthesis of high-thermal stability carbon dots and nanocomposites from oleic acid as an organic substrate

Cited by 42 publications

References 10 publications

Stable Fluorescence of Eu3+ Complex Nanostructures Beneath a Protein Skin for Potential Biometric Recognition

Stable Fluorescence of Eu3+ Complex Nanostructures Beneath a Protein Skin for Potential Biometric Recognition

Carbon Dot/Polymer Composites with Various Precursors and Their Sensing Applications: A Review

Nanocomposites Based on Polymer Blends and CNT

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