The role of the chemical composition on the photoluminescence properties of N-doped carbon nanoparticles

Solana, Andres; García-Fierro, José Luis; Moreno, María Dolores Merchán; Velázquez, M. Mercedes

doi:10.1016/j.jlumin.2019.116954

Cited by 9 publications

(7 citation statements)

References 59 publications

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“…Furthermore, three samples have similar IR bands within the range of ~1000 cm -1 which are assigned to the stretching vibrations of C-H. In addition, the peak at 1250 cm -1 is observed in UCQDs and UCQDs-peel assigned to armchair configuration, which appears at the edges of graphene layers being consistent with carbine and carbine structures at armchair sites [13]. And the presence at about 3173, 750, 1667, and 1448 cm -1 in the NCQDs due to the stretching or bending vibration of the N-H, CONH, and C-N groups [27], which indicates the effective nitrogen doping into CQDs occurring from urea.…”

Section: The Analysis Of Surface Chemistry Compositionsmentioning

confidence: 70%

“…According to studies of the existing luminescence mechanism, the fluorescence intensity of CQDs was influenced by surface states [12] and the structure [13] and size [14] of the materials. So far, scientists have made some researches on the enhancement of fluorescence intensity and tunable multi-color emissions of CQDs in order to realize its practical application.…”

Section: Introductionmentioning

confidence: 99%

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Green Synthesis of Carbon Dots from Grapefruit and Its Fluorescence Enhancement

Huo

et al. 2020

Journal of Nanomaterials

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In this study, undoped carbon quantum dots (UCQDs, UCQDs-peel) and N-doped carbon dots (NCQDs) were prepared by a facile one-pot environmentally friendly hydrothermal method using grapefruit as carbon sources in the absence and presence of area, respectively. The structure, morphology, and fluorescence properties of three samples were characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), and photoluminescence (PL). It was found that three types of CQDs could emit blue fluorescence with different intensities when irradiated with ultraviolet light. Compared to the luminescence properties of UCQDs, NCQDs, and UCQDs-peel, it can be seen that the fluorescence intensity of NCQDs was strongest due to the presence of NH and C-N bonds.

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Section: The Analysis Of Surface Chemistry Compositionsmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Green Synthesis of Carbon Dots from Grapefruit and Its Fluorescence Enhancement

Huo

et al. 2020

Journal of Nanomaterials

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“…CNPs were synthesized using the acidic oxidative process previously reported [65,67]. Briefly, 0.30 g of the graphitic materials were dispersed into a mixture of H 2 SO 4 (60 mL) and HNO 3 (20 mL).…”

Section: Synthesis Of Cnpsmentioning

confidence: 99%

“…To the best of our knowledge, this is the first time in the literature that Monod's model has been used to study the antibacterial capacity of CNPs as ligands. With this purpose, we have selected N-doped carbon nanoparticles synthesized from four different carbon precursors using acid oxidative synthesis, since we have proved in a previous work that both, size and chemical composition, depends on the precursors [65]. In particular, we have shown that the type of C-N bonds strongly depends on the precursor material used in the synthesis, and since that, the ability to donate electrons depends significantly on the type of C-N bond.…”

Section: Introductionmentioning

confidence: 99%

N-Doped Carbon Nanoparticles as Antibacterial Agents on Escherichia coli: The Role of the Size and Chemical Composition of Nanoparticles

2023

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In the last years N-doped carbon nanoparticles have been shown to have improved antibacterial activity over the undoped nanomaterial, but it is difficult to find correlations between the structure of the nanoparticle and its antibacterial activity. This prevents us from proposing a clear antibacterial mechanism and makes it difficult to select materials with the best physical and chemical properties for use as antibacterial agents. With this purpose, here, we analyze the effect of, the size and the surface chemical composition of four N-doped carbon nanoparticles on the growth of Escherichia coli bacteria, used in this work as a model of Gram-negative bacteria. Our results indicated great antibacterial activity as the concentration of the carbon nanoparticles increased. The IC50 values obtained ranged between 23 and 34 μg/mL, the lowest values found in the literature for CNPs in the absence of metals. The reduction rate was analyzed using a Ligand-Substrate model based on Monod’s equation, which allows us to interpret the dependence of the nanoparticle-bacteria affinity with the nanomaterial structure. The results of the model indicate the contribution of two mechanisms, oxidative stress and the nanoknife in the antibacterial process on Escherichia coli bacteria.

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“…The synthesis (scheme in Figure a) and structural characterization of this family of nanodots were thoroughly uncovered in our previous studies . The purification allows to obtain remarkable homogeneity in the dots and to unambiguously exclude the presence of impurities in the liquid phase. − Furthermore, this process was recently proven as a valuable tool to advance the CDs’ emission mechanism investigation. , In section S1 of the Supporting Information we report the complete structural characterization of the CDs herein investigated (as-synthesized and purified by SEC) with atomic force microscopy, high-resolution transmission electron microscopy, selected-area electron diffraction, X-ray photoelectron spectroscopy, and Fourier-transform infrared spectroscopy (Figures S1–S7). In particular, the structural analysis confirms that the crystalline structure of these dots is hexagonal β-C 3 N 4 .…”

Section: Introductionmentioning

confidence: 99%

Photocycle of Excitons in Nitrogen-Rich Carbon Nanodots: Implications for Photocatalysis and Photovoltaics

Gazzetto

Sciortino

Nazari

et al. 2020

ACS Appl. Nano Mater.

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Nitrogen-rich carbon nanodots have emerged as promising nanomaterials for a wide range of applications where a highly emissive and photoactive material with low toxicity and cost-effectiveness is required. One of their hallmarks is indeed a bright, tunable fluorescence of excitonic nature. Disentangling the origin of their optical absorption and fluorescence properties and uncovering relaxation channels and interactions with solvents are some of the most debated issues in the field. Uncovering these aspects is essential for targeted applications, especially in the fields of photocatalysis but also photovoltaics and optoelectronics. Here, we present dedicated transient absorption measurements of purified monodispersed nanodots covering all relevant electronic transitions. Monodispersed nanodots of about 6 nm size exhibit well-separated absorption and emission features and allow us to unambiguously establish the complete and size-independent femtosecond-to-nanosecond photocycle of nitrogen-rich carbon nanodots. Further rigorous analysis shows that the often complex absorption and emission spectra of an ensemble of nanodots with a broad size distribution result from the superposition of individual size-selective contributions.

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The role of the chemical composition on the photoluminescence properties of N-doped carbon nanoparticles

Cited by 9 publications

References 59 publications

Green Synthesis of Carbon Dots from Grapefruit and Its Fluorescence Enhancement

Green Synthesis of Carbon Dots from Grapefruit and Its Fluorescence Enhancement

N-Doped Carbon Nanoparticles as Antibacterial Agents on Escherichia coli: The Role of the Size and Chemical Composition of Nanoparticles

Photocycle of Excitons in Nitrogen-Rich Carbon Nanodots: Implications for Photocatalysis and Photovoltaics

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