Green synthesis of fluorescent carbon quantum dots from Eleusine coracana and their application as a fluorescence ‘turn-off’ sensor probe for selective detection of Cu2+

Murugan, Nagaraj; Prakash, M.; Jayakumar, M.; Sundaramurthy, Anandhakumar; Sundramoorthy, Ashok K.

doi:10.1016/j.apsusc.2019.01.090

Cited by 203 publications

(87 citation statements)

References 77 publications

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“…The ensuing carbon dots, even with the same particle-size distribution and chemical groups, have different degrees of surface oxidation (Liu et al 2017b). Additionally, highly fluorescent carbon quantum dots (~ 6 nm) were prepared by the pyrolysis of Eleusine coracana as a carbon source wherein Cu 2+ strongly quenched the fluorescent intensity of carbon quantum dots compared to other metal ions; Cu 2+ preferentially adsorbed on aromatic CC (π-bond) of carbon quantum dots, whereas other divalent metals form σ-bond(s) with the carbon quantum dots (Murugan et al 2019).…”

Section: Eco-friendly and Sustainable Synthesis Of Carbon Quantum Dotsmentioning

confidence: 99%

“…Expectantly, increasing interest in the fabrication of these quantum dots, in view of their straightforward production and their integration with other nanomaterials, is sustainable. Although various processes and starting materials have been researched for their assembly, none or handful of these nanostructures have been able to make into marketable products yet (Liu et al 2017b;Wang et al 2016b;Murugan et al 2019;Halder et al 2018;Chen et al 2019;de Menezes et al 2019;Barras et al 2016;Nekoueian et al 2019;Li et al 2015;Mei et al 2016;Lin et al 2014).…”

Section: Challenges and Opportunitiesmentioning

confidence: 99%

“…Photoluminescence is one of the extremely attractive characteristics of carbon and graphene quantum dots, but these properties are highly dependent on the raw materials deployed in fabrication and the presence of surface functionalities on these particles which are noticeable in the case of carbon quantum dots from organic molecules and biomass. Most importantly, one of the lingering challenges has been to improve and develop the quantum yield of carbon quantum dots while taking full advantage of their intrinsic characteristics and to fine-tune their emission spectrum; the improvement in carbon quantum dots with strong fluorescence emission is crucial for biomedical imaging without harmful effects (Liu et al 2017b;Wang et al 2016b;Murugan et al 2019;Halder et al 2018;Chen et al 2019;de Menezes et al 2019;Barras et al 2016;Nekoueian et al 2019;Li et al 2015;Mei et al 2016;Lin et al 2014).…”

Section: Challenges and Opportunitiesmentioning

confidence: 99%

See 2 more Smart Citations

Green synthesis, biomedical and biotechnological applications of carbon and graphene quantum dots. A review

2020

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Carbon and graphene quantum dots are prepared using top-down and bottom-up methods. Sustainable synthesis of quantum dots has several advantages such as the use of low-cost and non-toxic raw materials, simple operations, expeditious reactions, renewable resources and straightforward post-processing steps. These nanomaterials are promising for clinical and biomedical sciences, especially in bioimaging, diagnosis, bioanalytical assays and biosensors. Here we review green methods for the fabrication of quantum dots, and biomedical and biotechnological applications.

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Section: Eco-friendly and Sustainable Synthesis Of Carbon Quantum Dotsmentioning

confidence: 99%

Section: Challenges and Opportunitiesmentioning

confidence: 99%

Section: Challenges and Opportunitiesmentioning

confidence: 99%

See 1 more Smart Citation

Green synthesis, biomedical and biotechnological applications of carbon and graphene quantum dots. A review

2020

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“…After freeze drying, the CDs powders can be isolated from the solution that must undergo a purification action with high efficiency no matter how the synthetic method changes, and it is related to the varying sizes and the luminescent concerns. Several purification operations have been launched, including silica‐gel column chromatography, [ 99 ] dialysis, [ 112b,113 ] filtration, [ 114,115 ] and so on. It is often difficult to get higher PL QY%.…”

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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“…Compared with the traditional organic fluorescent materials, QD fluorescent probes have narrower emission spectra, better stability, and photobleaching resistance. For example, carbon QDs,8,9 CdSe QDs,10 CdS QDs,11 perovskites QDs,12 and a combination of functional molecules and QDs have been studied to detect metal ions such as Fe 3+ , Pb 2+ , Hg 2+ , Zn 2+ , and Cd 2+ 13–18. However, currently reported fluorescent probes can be used in only one solvent, it is therefore necessary to develop fluorescent probes with strong selectivity, wide detection range, and low detection limit, which can be used in both aqueous and organic solutions.…”

Section: Introductionmentioning

confidence: 99%

A Fluorescence Probe for Metal Ions Based on Black Phosphorus Quantum Dots

Yuan

et al. 2020

Adv Materials Inter

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spectroscopy (ICP-AES), and surface plasmon resonance sensing. [4][5][6] Although these methods have high detection performances, the complicated preprocessing process and the excessive cost limit their range of use and the detection rate. On the other hand, with the advancement of fluorescence technology, fluorescence detection techniques for metal ions by monitoring the fluorescence enhancement, quenching, or shifting of peak positions have attracted great interests. This type of method has advantages of strong visibility, simple operation, wide detection range, and low price. [7] Recently, quantum dot (QD) fluorescent probes are gradually receiving more attentions. Compared with the traditional organic fluorescent materials, QD fluorescent probes have narrower emission spectra, better stability, and photobleaching resistance. For example, carbon QDs, [8,9] CdSe QDs, [10] CdS QDs, [11] perovskites QDs, [12] and a combination of functional molecules and QDs have been studied to detect metal ions such as Fe 3+ , Pb 2+ , Hg 2+ , Zn 2+ , and Cd 2+ . [13][14][15][16][17][18] However, currently reported fluorescent probes can be used in only one solvent, it is therefore necessary to develop fluorescent probes with strong selectivity, wide detection range, and low detection limit, which can be used in both aqueous and organic solutions.Black phosphorus (BP) as one of the three major allotropes of phosphorus is a 2D van der Waals material whose atomic layers are stacked by weak van der Waals forces. BP can be stripped into nanosheets down to a single layer or quantum dots with bandgaps varying from 0.3 (bulk BP) to 2.0 eV. Due to this unique property, BP has the size and composition-dependent light absorption, long exciton lifetime, high photo luminescence quantum yield, and ability of surface modification. So far, BP has been used as photothermal agents, photodetectors, photocatalysts, organic photovoltaics, electrocatalysts, and the storage media. [19][20][21][22][23][24] BP has also been studied in the field of sensors, such as humidity sensors, [25] ratiometric fluorescent probes developed by the surface modification of organic molecules, [26,27] field effect transistor detection of metal ions. [28] In addition, BP has a wide range of applications in the biological field, including the medicine, drug carriers, and cancer treatment. [29][30][31] In this research, we have successfully prepared black phosphorus quantum dots (BP QDs) with green fluorescence emission, which can directly detect trace Hg 2+ and Cu 2+ ions without the help of organic molecules. In particular, Fluorescence method for detecting metal ions has advantages of fast detection speed, simple operation, and low price over the conventional methods. Black phosphorus quantum dots (BP QDs) have high photoluminescence quantum yield and modifiable surface, which have great potential in the field of fluorescent probes. In this study, high quality BP QDs are prepared by pyrolysis method and are first time used as trace metal ion probes in both organic solut...

show abstract

Green synthesis of fluorescent carbon quantum dots from Eleusine coracana and their application as a fluorescence ‘turn-off’ sensor probe for selective detection of Cu2+

Cited by 203 publications

References 77 publications

Green synthesis, biomedical and biotechnological applications of carbon and graphene quantum dots. A review

Green synthesis, biomedical and biotechnological applications of carbon and graphene quantum dots. A review

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

A Fluorescence Probe for Metal Ions Based on Black Phosphorus Quantum Dots

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