Blue-fluorescent and biocompatible carbon dots derived from abundant low-quality coals

Das, Tonkeswar; Saikia, Binoy K.; Dekaboruah, Hari P.; Bordoloi, Manobjyoti; Neog, Dipankar; Bora, Jayanta; Lahkar, Jiumoni; Narzary, Bardwi; Roy, Sonali; Ramaiah, Danaboyina

doi:10.1016/j.jphotobiol.2019.04.004

Cited by 70 publications

(53 citation statements)

References 49 publications

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“…The similar physical properties observed for the two types of CDs may be due to the precursors' subjection to the same time and temperature of carbonization. The nanomaterials synthesized here in this research have similar shapes, particle size, and excitation/emission wavelengths at 360 nm/430 nm despite utilizing different dopants, and the different dopants may be responsible for the different levels of crystallinity and peak intensities of the CDs [1,65,75,83,84]. X-ray diffraction (XRD) technique is a fundamental analytical process that helps in studying, determining, and identifying powdered heteroatoms dopped CDs structure, purity, and crystallinity [85,86].…”

Section: Determination Of Photoluminescence Quantum Yieldmentioning

confidence: 99%

Facile Hydrothermal and Solvothermal Synthesis and Characterization of Nitrogen-Doped Carbon Dots from Palm Kernel Shell Precursor

et al. 2021

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Carbon dots (CDs), a nanomaterial synthesized from organic precursors rich in carbon content with excellent fluorescent property, are in high demand for many purposes, including sensing and biosensing applications. This research focused on preparing CDs from natural and abundant waste, palm kernel shells (PKS) obtained from palm oil biomass, aiming for sensing and biosensing applications. Ethylenediamine and L-phenylalanine doped CDs were produced via the hydrothermal and solvothermal methods using one-pot synthesis techniques in an autoclave batch reactor. The as-prepared N-CDs shows excellent photoluminescence (PL) property and a quantum yield (QY) of 13.7% for ethylenediamine (EDA) doped N-CDs (CDs-EDA) and 8.6% for L-phenylalanine (L-Ph) doped N-CDs (CDs-LPh) with an excitation/emission wavelength of 360 nm/450 nm. The transmission electron microscopy (TEM) images show the N-CDs have an average particle size of 2 nm for both CDs. UV-Visible spectrophotometric results showed C=C and C=O transition. FTIR results show and confirm the presence of functional groups, such as -OH, -C=O, -NH2 on the N-CDs, and the X-ray diffraction pattern showed that the N-CDs were crystalline, depicted with sharp peaks. This research work demonstrated that palm kernel shell biomass often thrown away as waste can produce CDs with excellent physicochemical properties.

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Section: Determination Of Photoluminescence Quantum Yieldmentioning

confidence: 99%

Facile Hydrothermal and Solvothermal Synthesis and Characterization of Nitrogen-Doped Carbon Dots from Palm Kernel Shell Precursor

et al. 2021

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“…As shown in Figure 2F, the Raman I D /I G ratio of the CDs is 0.97, which suggests the prepared CDs contain sp 2 and sp 3 hybrid carbonaceous cores. 56 To further investigate the optical properties of the CDs, exhaustive research of UV-vis and PL were carried out, respectively. As exhibited in Figure 3A, The UV-vis spectrum depicts that the CDs exhibited strong light absorption in the ultraviolet, and the tail can extend the visible light tends, which resembles the CDs reported in the previous study.…”

Section: Preparation and Characterization Of Cdsmentioning

confidence: 99%

“…Furthermore, as shown in Figure 3C obvious excitation-dependent PL property, which is attributed to numerous chromophore or fluorophore systems with aromatic and oxidation groups are present. 46,56 In Figure 3D, the time-resolved single-photon counting spectroscopy of the prepared CDs is shown. The timeresolved PL decay exhibits a bi-exponential decay function with an average lifetime of 4.96 ns, which included two components of the fast decay time τ 1 of 2.07 ns (35.2%), and the long decay time τ 2 of 7.85 ns (64.8%).…”

Section: Preparation and Characterization Of Cdsmentioning

confidence: 99%

Hydrothermal synthesis of blue‐green emitting carbon dots based on the liquid products of biodegradation of coal

et al. 2021

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The liquid products of biodegradation of coal (LPBC) without further separation and purification are generally difficult to apply. In this study, a simple and low-cost method had been described for the preparation of carbon dots (CDs) by hydrothermal treatment of original LPBC. The as-synthesized CDs scence emission intensity when possessed narrowly distributed sizes and a mean diameter of 3.5 nm, and they showed significant excitation-dependent fluorescence emission. Meanwhile, the CDs exhibited good water solubility and photo-, metal ions-stability. Furthermore, the fluorescent emission intensity of CDs had been demonstrated sensitivity to pH value and temperature, showing great promise in sensor application.

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“…Usually, top‐down tactics suffers from cumbersome and inefficient techniques, including for laser ablation, arc discharge, thermal decomposition, electrochemical/ultrasonicated oxidation. [ 51–54,59–67 ] In this way, Hu et al operated on coal with the assistance of active hydroxyl radicals (*OH) from H 2 O 2 oxidizing agent and obtained inexpensive excited‐wavelength‐dependent CDs ( Figure a). [ 68 ] Meng et al developed concentration‐dependent multicolor CDs through a facile reaction of coal pitch powder with the mixed solution of formic acid and H 2 O 2 without any external heating and additional energy input (Figure 2b).…”

Section: The Preparation Of Multicolor Cdsmentioning

confidence: 99%

Preparation and Biomedical Applications of Multicolor Carbon Dots: Recent Advances and Future Challenges

Huo

Karmaker

Liu

et al. 2020

Part & Part Syst Charact

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as 0D and discrete, quasispherical nanoparticles with the characteristic size of less than 10 nm in shape. In the past few decades, many researchers have been intrigued by overwhelming application of CDs in fields other than solar photovoltaics, [23][24][25] semiconductor photocatalysis, [26] or light-emitting materials, [27][28][29] like in bioimaging, [30][31][32][33] drug delivery/ release, [34][35][36] theranostics, [37] and biosensing/bioassay. [38][39][40] Albeit with biological imaging agents in vitro and in vivo, heavy metals as the essential elements for the core materials of available high-performance semiconductor quantum dots (QDs) exist substantial toxicity, carcinogenic effects, and environmental hazard, even at low levels. [41][42][43][44][45] Historically, boasting the natural virtues of fascinating optical properties (e.g., up/down-conversion and excitation-dependent fluorescence emission, high fluorescence quantum yields (QY), and long fluorescence lifetime), eco-friendliness, high waterdispersible peculiarity, easy surface-functionality, low cost, highly abundant, and inexpensive raw materials, noninvasiveness, low cytotoxicity, and good biocompatibility afford CDs suitable as the elegant alternatives for toxic QDs containing heavy metals. [46][47][48][49] On the other hand, the CDs have excellent photostability against photobleaching and photoblinking as compared with the conventional organic dyes (typically fluorescein and rhodamine B). [50] In particular, multicolor CDs exhibit tunable photoluminescence by exciting the identical CDs, allowing for multimodal biophotosensitizer in biological field without interference from background autofluorescence. In this review, we aim to systematically offer a summary of preparing multicolor CDs and its various biomedical applications, mainly including for bioimaging, drug delivery/release, theranostics, and biosensing/bioassay, highlighting the complete horizons of multiplexed quantitative detection, high-resolution fluorescence imaging, and long-term, real-time monitoring of multicolor CDs.Multicolor carbon dots (CDs) as an emerging subclass of carbonaceous nanomaterials have inspired intensive attention due to the fascinating fluorogenic properties of quantum dots, exhibiting great potential applications in the biomedical field. In some cases, reported CDs with blue or green fluorescence are not desirable for further biological applications owing to the conflicting background autofluorescence, low penetration, and relatively large damage to biological tissue. However, multicolor CDs that can work in the longer wavelength region are being developed to address this issue by overcoming the autofluorescence from the cellular components (usually in the blue and green range). In this review, the development of multicolor CDs is described comprehensively, including for red-emissive or NIR-emissive CDs. Additionally, the preparation methods of multicolor CDs are summarized. Moreover, the factors affecting the luminescence of multicolor CDs are discussed in de...

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Blue-fluorescent and biocompatible carbon dots derived from abundant low-quality coals

Cited by 70 publications

References 49 publications

Facile Hydrothermal and Solvothermal Synthesis and Characterization of Nitrogen-Doped Carbon Dots from Palm Kernel Shell Precursor

Facile Hydrothermal and Solvothermal Synthesis and Characterization of Nitrogen-Doped Carbon Dots from Palm Kernel Shell Precursor

Hydrothermal synthesis of blue‐green emitting carbon dots based on the liquid products of biodegradation of coal

Preparation and Biomedical Applications of Multicolor Carbon Dots: Recent Advances and Future Challenges

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