One-step spontaneous synthesis of fluorescent carbon nanoparticles with thermosensitivity from polyethylene glycol

Li, Siqiao; Pan, Renfeng; Mehdi, Yamina Ait; Xiao, Deli; He, Hua

doi:10.1039/c5nj01129a

Cited by 19 publications

(3 citation statements)

References 40 publications

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“…With the rise in temperature, the fluorescence intensity of N,S-CQDs gradually decreased. According to previous reports, − this phenomenon could be attributed to the photoexcited electronic relaxation of N,S-CQDs during heating, which included radiative relaxation, nonradiative relaxation, and thermally activated trapping in surface and impurity states. At low temperature, nonradiative relaxation was not thermally activated, so excited electrons could radioactively emit photons.…”

Section: Resultsmentioning

confidence: 62%

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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Section: Resultsmentioning

confidence: 62%

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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“…It can be seen that the QYs increase obviously with the increase of HCl concentration up to 0.96 mol/L, and the highest QY is 43%, which is higher than the QYs of most CDs prepared from PEG (Table S1). ,, On the basis of the QYs, other reaction conditions were optimized, and the selected optimal conductions were as follows: 0.3 g [C 4 mim]Br, 0.9 g PEG 2000N , and 0.96 mol/L HCl were heated at 200 °C for 12 h.…”

Section: Results and Discussionmentioning

confidence: 99%

One-Step Synthesis of Acidophilic Highly-Photoluminescent Carbon Dots Modified by Ionic Liquid from Polyethylene Glycol

Chen

Yang

et al. 2017

ACS Omega

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Acidophilic highly-photoluminescent ionic liquid (IL)-modified carbon dots (CDs) were fabricated directly from polyethylene glycol-2000 (PEG 2000N ) by a simple one-step hydrothermal method in a system containing an IL (1-butyl-3-methylimidazolium bromide [C 4 mim]Br) and hydrochloric acid (HCl). In this process, PEG 2000N works as the carbon source, [C 4 mim]Br as the modifier, and HCl as the accelerator. CDs with low photoluminescence (PL) intensity and quantum yields (QYs) were generated in the system without H + , but CDs with high PL intensity and QYs could be prepared after H + was introduced. Moreover, with the increase of H + concentration, the QYs of the prepared CDs increase subsequently, and the highest QY reaches up to 43%. The formation mechanism was explored, and the results showed that H + changes the surface groups of the CDs generated without H + into those that exist on the CDs generated with H + , which further improves the PL performance of the CDs. Different from most CDs reported in the literature, the as-prepared CDs can still exhibit high PL intensity even under strong acidic condition.

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“…Carbon dots (CDs) are emerging nanomaterials in the nanocarbon family with sizes less than 10 nm, which were firstly obtained in the purification of single-walled carbon nanotubes (SWCNTs) by electrophoresis in 2004 [ 18 ]. It is noteworthy that CDs gradually substitute semiconductor quantum dots on the grounds of high solubility in water, low cytotoxicity, high photostability, excitation-dependent multicolor emission, preferable flexibility in surface modification, excellent cell permeability, and better biocompatibility [ 19 , 20 ]. Generally, the CDs mainly comprise carbon quantum dots (CQDs) and graphene quantum dots (GQDs).…”

Section: Synthesis Of Fluorescent Nanomaterialsmentioning

confidence: 99%

Advances and Challenges of Fluorescent Nanomaterials for Synthesis and Biomedical Applications

Xiao

Teng

et al. 2021

Nanoscale Res Lett

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With the rapid development of nanotechnology, new types of fluorescent nanomaterials (FNMs) have been springing up in the past two decades. The nanometer scale endows FNMs with unique optical properties which play a critical role in their applications in bioimaging and fluorescence-dependent detections. However, since low selectivity as well as low photoluminescence efficiency of fluorescent nanomaterials hinders their applications in imaging and detection to some extent, scientists are still in search of synthesizing new FNMs with better properties. In this review, a variety of fluorescent nanoparticles are summarized including semiconductor quantum dots, carbon dots, carbon nanoparticles, carbon nanotubes, graphene-based nanomaterials, noble metal nanoparticles, silica nanoparticles, phosphors and organic frameworks. We highlight the recent advances of the latest developments in the synthesis of FNMs and their applications in the biomedical field in recent years. Furthermore, the main theories, methods, and limitations of the synthesis and applications of FNMs have been reviewed and discussed. In addition, challenges in synthesis and biomedical applications are systematically summarized as well. The future directions and perspectives of FNMs in clinical applications are also presented.

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One-step spontaneous synthesis of fluorescent carbon nanoparticles with thermosensitivity from polyethylene glycol

Cited by 19 publications

References 40 publications

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

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

One-Step Synthesis of Acidophilic Highly-Photoluminescent Carbon Dots Modified by Ionic Liquid from Polyethylene Glycol

Advances and Challenges of Fluorescent Nanomaterials for Synthesis and Biomedical Applications

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One-step spontaneous synthesis of fluorescent carbon nanoparticles with thermosensitivity from polyethylene glycol

Cited by 19 publications

References 40 publications

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

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

One-Step Synthesis of Acidophilic Highly-Photoluminescent Carbon Dots Modified by Ionic Liquid from Polyethylene Glycol

Advances and Challenges of Fluorescent Nanomaterials for Synthesis and Biomedical Applications

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

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