New insight into pyrrolic-N site effect towards the first NIR window absorption of pyrrolic-N-rich carbon dots

Permatasari, Fitri Aulia; Umami, Reza; Sundari, Citra Deliana Dewi; Mayangsari, Tirta Rona; Ivansyah, Atthar Luqman; Muttaqien, Fahdzi; Ogi, Takashi; Iskandar, Ferry

doi:10.1007/s12274-022-5131-7

Cited by 14 publications

(14 citation statements)

References 56 publications

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“…Correspondingly, the peaks of pyridine N, pyrrolic N, and graphite N are also obtained from their high-resolution N 1s XPS envelopes (third column in Figure ). A sequential decrease of pyridine N and increase of pyrrolic N in CQDs-3-1, CQDs-7-2, CQDs-9-1, and CQDs-7-1 (Table S2) can explain why CQDs-7-1 has a strongest absorption in the long wavelength. ,, At last, two peaks at 532 and 531 eV are discerned from the high-resolution O 1s XPS spectra (fourth column in Figure ), attributed to the C–O and CO bonds, respectively. The deconvoluted results (Table S3) indicate that the carbonyl bond increases in the order of CQDs-3-1, CQDs-7-2, CQDs-9-1, and CQDs-7-1.…”

Section: Resultsmentioning

confidence: 95%

“…Differences in chemical states between various CQDs are also discussed. Considering that the addition of UR is relatively low when preparing CQDs-3-1, it is not surprising that these CQDs have lower N-doping and pyrrolic N. On the other hand, overcarbonization would occur for CQDs-7-2 due to the longer reaction time, which results in a high content of aryl C. Although both UV–vis absorption spectra (Figure a) and NMR spectra (Figure ) of CQDs-7-1 and CQDs-9-1 are very similar, the results of FTIR and XPS demonstrate that the former has more amide groups and pyrrolic N, which play a vital role in increasing the absorption of long wavelength. ,, This contributes to the formation of photothermal CQDs. Combining the FTIR, NMR, and XPS results, the CQDs prepared under the optimal parameters (CA/UR = 1/7, 150 °C, and 1 h) were schematically depicted (Figure S3) and applied in the following research works.…”

Section: Resultsmentioning

confidence: 95%

“…Besides, more N- and O-functional groups (e.g., amide, amino, carboxyl and aryloxyl) on the surfaces of CQDs would also increase the absorption in the near-infrared region. , In addition, we found that there was no fluorescence emission when excited at 650 nm, indicating that much of absorbed energy will be converted to thermal energy through a nonradiative relaxation. Apart from these reasons, the as-prepared CQDs have ultrasmall size and excellent solubility and dispersion in water, which lead to more efficient energy conversion and rapid transfer of the generated heat to the surrounding medium. ,,− …”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Carbon Quantum Dots with High Photothermal Conversion Efficiency and Their Application in Photothermal Modulated Reversible Deformation of Poly(N-isopropylacrylamide) Hydrogel

Zhai

Dong

et al. 2023

ACS Appl. Bio Mater.

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The fluorescence of carbon quantum dots (CQDs) has been paid a lot of attention, but its photothermal performance attracts less attention since preparing CQDs with high photothermal conversion efficiency (PCE) is a big challenge. In this work, CQDs with an average size of 2.3 nm and a PCE of up to 59.4% under 650 nm laser irradiation were synthesized by a simple one-pot microwave-assisted solvothermal method using citric acid (CA) and urea (UR) as the precursors and N,N-dimethylformamide as the solvent under an optimized condition (CA/UR = 1/7, 150 °C, and 1 h). The as-prepared CQDs were demonstrated to have unique surface chemical states; i.e., abundant pyrrole, amide, carboxyl, and hydroxyl groups were found on the surfaces of CQDs, which ensure a high PCE. These CQDs were introduced into a thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) to form a CQDs@PNIPAM nanocomposite, and then, a bilayer hydrogel composed of CQDs@PNIPAM and polyacrylamide (PAM) was fabricated. The bilayer hydrogel can be reversibly deformed just by a light switching on/off operation. Based on the excellent photothermal performance, the developed CQDs are expected to be used in photothermal therapy, photoacoustic imaging, and other biomedical fields, and the CQDs@PNIPAM hydrogel nanocomposite is promising to be applied in intelligent device systems as a light-driven smart flexible material.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Carbon Quantum Dots with High Photothermal Conversion Efficiency and Their Application in Photothermal Modulated Reversible Deformation of Poly(N-isopropylacrylamide) Hydrogel

Zhai

Dong

et al. 2023

ACS Appl. Bio Mater.

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“…Carbon dot (CDs)-derived ligands in this investigation were screened for their inhibitory ability against ACE2, with the optimized structure shown in Figure . Pyridinic-N, Pyrrolic-N, and Graphitic-N CDs are a variation of N-doped CDs, which are attractive to be explored in previous studies and applications. ,, The results of docking using YASARA software on the four ligand compounds and ACE2 yielded data with binding energy values. The binding energy is calculated using an empirical equation as shown in eq …”

Section: Resultsmentioning

confidence: 99%

“…Pyridinic-N, Pyrrolic-N, and Graphitic-N CDs are a variation of N-doped CDs, which are attractive to be explored in previous studies and applications. 35 , 43 , 44 The results of docking using YASARA software on the four ligand compounds and ACE2 yielded data with binding energy values. The binding energy is calculated using an empirical equation as shown in eq 1 .…”

Section: Resultsmentioning

confidence: 99%

In Vitro and Silico Studies on the N-Doped Carbon Dots Potential in ACE2 Expression Modulation

et al. 2023

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The alteration of ACE2 expression level, which has been studied in many diseases, makes the topic of ACE2 inducer potential crucial to be explored. The ACE2 inducer could further be designed to control the ACE2 expression level, which is appropriate to a specific case. An in vitro study of well-characterized carbon dots (CDs), made from citric acid and urea, was performed to determine their ability to modulate the ACE2 receptor. Gene expression of ACE2 was quantified using concentrations adjusted for IC50 results from CDs viability assays in HEK 293 and A549 cell lines. RT-qPCR was used to assess the expression of the ACE2 gene and its induction effect in normal cell lines (HEK-293A). According to the results of the tests, ACE2 is expressed in HEK-293A cell lines, and diminazene aceturate can increase ACE2 expression. The effect of CDs on ACE2 gene expression was further examined on the cell lines that had previously been induced with diminazene aceturate, which resulted in upregulation of the ACE2 expression level. An in silico study has been done by using a molecular docking approach. The molecular docking results show that CDs can make strong interactions with ACE2 amino acid residues through hydrophobic interaction, π–π interaction, π-cation interaction, and ionic interaction.

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Carbon Dots for Electroluminescent Light‐Emitting Diodes: Recent Progress and Future Prospects

Shi

Yuan

et al. 2023

Advanced Materials

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Carbon dots (CDs), as emerging carbon nanomaterials, have been regarded as promising alternatives for electroluminescent light‐emitting diodes (LEDs) owing to their distinct characteristics, such as low toxicity, tuneable photoluminescence, and good photostability. In the last few years, despite remarkable progress achieved in CD‐based LEDs, their device performance is still inferior to that of well‐developed organic, heavy‐metal‐based QDs, and perovskite LEDs. To better exploit LED applications and boost device performance, in this review, a comprehensive overview of currently explored CDs is presented, focusing on their key optical characteristics, which are closely related to the structural design of CDs from their carbon core to surface modifications, and to macroscopic structural engineering, including the embedding of CDs in the matrix or spatial arrangement of CDs. The design of CD‐based LEDs for display and lighting applications based on the fluorescence, phosphorescence, and delayed fluorescence emission of CDs is also highlighted. Finally, it is concluded with a discussion regarding the key challenges and plausible prospects in this field. It is hoped that this review inspires more extensive research on CDs from a new perspective and promotes practical applications of CD‐based LEDs in multiple directions of current and future research.

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New insight into pyrrolic-N site effect towards the first NIR window absorption of pyrrolic-N-rich carbon dots

Cited by 14 publications

References 56 publications

Carbon Quantum Dots with High Photothermal Conversion Efficiency and Their Application in Photothermal Modulated Reversible Deformation of Poly(N-isopropylacrylamide) Hydrogel

Carbon Quantum Dots with High Photothermal Conversion Efficiency and Their Application in Photothermal Modulated Reversible Deformation of Poly(N-isopropylacrylamide) Hydrogel

In Vitro and Silico Studies on the N-Doped Carbon Dots Potential in ACE2 Expression Modulation

Carbon Dots for Electroluminescent Light‐Emitting Diodes: Recent Progress and Future Prospects

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