Pyrolysis of single carbon sources in SBA-15: A recyclable solid phase synthesis to obtain uniform carbon dots with tunable luminescence

Niu, Xiaoqing; Zheng, Weijie; Song, Tian‐shun; Huang, Zun‐Hui; Yang, Chunlei; Zhang, Liming; Li, Wei; Xiong, Hongwei

doi:10.1016/j.cclet.2022.05.074

Cited by 18 publications

(11 citation statements)

References 42 publications

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“…17 In addition, the presence of C�O bonds can be seen in the O 1s spectrum (Figure 2e). 18 The high-resolution N 1s spectrum was deconvoluted into two peaks with the binding energies at 399.8 and 401.6 eV, corresponding to C−N and pyrrole N. 19 The above results are in good accordance with the of FTIR analysis. To sum up, the as-prepared PET-CDs was not only successfully doped with nitrogen in the form of pyrrole N structures but also was covered with −NH 2 and abundant oxygen-containing functional group, which makes it easy to combine with various materials for modification and functionalization in the form of chemical bonds.…”

Section: Morphological Characteristics Of Pet-cdssupporting

confidence: 55%

“…It can be found that the high-resolution C 1s spectrum can be fitted with three peaks at 284.8, 286.3, and 288.8 ev, representing CC/C–C bonds, CO bonds, and C–N bonds . In addition, the presence of CO bonds can be seen in the O 1s spectrum (Figure e) . The high-resolution N 1s spectrum was deconvoluted into two peaks with the binding energies at 399.8 and 401.6 eV, corresponding to C–N and pyrrole N .…”

Section: Resultsmentioning

confidence: 91%

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Preparation of Carbon Dots with Ultrahigh Fluorescence Quantum Yield Based on PET Waste

Zhang

et al. 2022

ACS Omega

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Environmentally friendly polyethylene terephthalate-based carbon dots (PET-CDs) with ultrahigh fluorescence quantum yield were prepared with waste PET textiles as raw materials. First, oligomers were prepared from the reaction of waste PET textile and ethylene glycol by the microwave method. Then, the mixture without isolation and purification as well as pyromellitic acid and urea were adopted as precursors for the preparation of PET-CDs by the hydrothermal method. It was found that the as-prepared PET-CDs had a spherical structure with an average particle size of 2.8 nm. The carbon core of PET-CDs was a graphene-like structure doped with nitrogen atoms in the form of pyrrole nitrogen and the surface contained −NH2, which is convenient for modification and functionalization with various materials in the form of chemical bonds. The as-prepared PET-CDs exhibit excitation-independent emission properties in the range from 340 to 440 nm, and the best excitation and emission wavelengths of PET-CDs are 406 and 485 nm, respectively, while the fluorescence quantum yield is 97.3%. In terms of the application, the as-prepared PET-CDs could be adopted as a fluorescence probe for the detection of Fe3+, and the limit of detection is as low as 0.2 μmol/L. The mechanism of PET-CDs by Fe3+ was found to be the static quenching mechanism. In addition, PET-CDs can be used in LEDs and fluorescent anticounterfeiting.

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Section: Morphological Characteristics Of Pet-cdssupporting

confidence: 55%

Section: Resultsmentioning

confidence: 91%

Preparation of Carbon Dots with Ultrahigh Fluorescence Quantum Yield Based on PET Waste

Zhang

et al. 2022

ACS Omega

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“…The CQDs had a uniform size, narrow particle size distribution, and quantum yield of 88%. The emission wavelength of the synthesized CQDs was not determined by their size but by their composition and surface state, which opens the door for synthesizing high yield, low-cost, and tunable luminescent solid-phase homogeneous CQDs …”

Section: Sensing and Imaging Applications Of Cds-based Sensorsmentioning

confidence: 99%

“…The emission wavelength of the synthesized CQDs was not determined by their size but by their composition and surface state, which opens the door for synthesizing high yield, low-cost, and tunable luminescent solid-phase homogeneous CQDs. 678 Other organic materials (organic acids, amines, and polymers) can be used as carbon sources to produce CQDs containing amorphous carbon nuclei rich in doping sites and functional groups. Wu et al designed an efficient organic solvent-proportional fluorescence-sensing platform (Figure 18i) and found that CQDs synthesized using 2,5-dihydroxyterephthalic acid as the precursor underwent a visible fluorescence transition from blue to green with increasing water content in the organic solvent owing to intermolecular hydrogen-bonding interactions between CQDs and water molecules, which indicates that CQDs have promising applications as chemical sensors and multicolor displays.…”

Section: Sensing and Imaging Applications Of Cds-based Sensorsmentioning

confidence: 99%

Zero-Dimensional Carbon Nanomaterials for Fluorescent Sensing and Imaging

Yang,

Xu,

et al. 2023

Chem. Rev.

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Advances in nanotechnology and nanomaterials have attracted considerable interest and play key roles in scientific innovations in diverse fields. In particular, increased attention has been focused on carbon-based nanomaterials exhibiting diverse extended structures and unique properties. Among these materials, zero-dimensional structures, including fullerenes, carbon nano-onions, carbon nanodiamonds, and carbon dots, possess excellent bioaffinities and superior fluorescence properties that make these structures suitable for application to environmental and biological sensing, imaging, and therapeutics. This review provides a systematic overview of the classification and structural properties, design principles and preparation methods, and optical properties and sensing applications of zero-dimensional carbon nanomaterials. Recent interesting breakthroughs in the sensitive and selective sensing and imaging of heavy metal pollutants, hazardous substances, and bioactive molecules as well as applications in information encryption, super-resolution and photoacoustic imaging, and phototherapy and nanomedicine delivery are the main focus of this review. Finally, future challenges and prospects of these materials are highlighted and envisaged. This review presents a comprehensive basis and directions for designing, developing, and applying fascinating fluorescent sensors fabricated based on zero-dimensional carbon nanomaterials for specific requirements in numerous research fields.

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“…To date, researchers have established a few C-dot separation systems, which can be classified into two categories, i.e., coarse separation and fine separation. Coarse separation includes dialysis, 15,16 precipitation, 17 and extraction; 18 while fine separation here refers to various chromatography-based separation techniques. 19−23 Despite the latter possessing better separation performances as compared with the former, the adequate separation is often difficult to be achieved for the existing chromatography systems due to their intrinsic problems/limitations.…”

Section: ■ Introductionmentioning

confidence: 99%

General Separation of Carbon Dots by Polyamide Chromatography

Guo,

Xia

2024

Anal. Chem.

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Carbon dot (C-dot) separation/purification is not only a fundamental chemical issue but also an essential precondition for revealing C-dots' true nature. To date, adequate separation of C-dots has remained an open question due to the lack of an appropriate fine separation system. Herein, we discover and reveal that polyamide chromatography can provide versatile and powerful performances for C-dot separation. By a joint study of experiments and all-atom molecular dynamics simulations, we demonstrate that multiple interaction forces, including electrostatic repulsion/attraction, hydrogen bond, and van der Waals effects, exist simultaneously among the stationary phase, mobile phase, and the separated C-dots. Furthermore, the magnitude of these forces is dependent on the surface chemistry of the separated C-dots and the nature of the used mobile phases, providing a theoretical basis and experimental operability for C-dot separation. So, the proposed system possesses the capacity for adequately separating hydrophilic, amphiphilic, and lipophilic C-dots. The polyamide chromatography, due to its versatile and powerful separation performances, not only provides more thorough separation effects but also helps to correct our false perceptions from inadequate purified C-dots.

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Pyrolysis of single carbon sources in SBA-15: A recyclable solid phase synthesis to obtain uniform carbon dots with tunable luminescence

Cited by 18 publications

References 42 publications

Preparation of Carbon Dots with Ultrahigh Fluorescence Quantum Yield Based on PET Waste

Preparation of Carbon Dots with Ultrahigh Fluorescence Quantum Yield Based on PET Waste

Zero-Dimensional Carbon Nanomaterials for Fluorescent Sensing and Imaging

General Separation of Carbon Dots by Polyamide Chromatography

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