Highly fluorescent carbon dots as nanoprobes for sensitive and selective determination of 4-nitrophenol in surface waters

Ahmed, Gaber Hashem Gaber; Badía‐Laiño, Rosana; Calzón, Josefa A. Garcı́a; Dı́az-Garcı́a, Marta Elena

doi:10.1007/s00604-014-1302-x

Cited by 91 publications

(34 citation statements)

References 33 publications

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“…Recently, using the bottom-up approach, we prepared C-dots based on the thermal carbonization of a mixture of nitrogen-containing organic compounds, ethyleneglycol bis(2-aminoethyl ether)- N , N , N ′, N ′-tetraacetic acid (EGTA) and Tris, thus providing them not only with surface hydroxy but also with amino groups. These C-dots were successfully employed for sensitive detecting 4-nitrophenol in water [7]. In another work, with the aim to provide surface boronic groups, we prepared C-dots by hydrothermal treatment of a mixture of 6-bromohexylboronic acid, polyethyleneglycol bis(3-aminopropyl)-terminated (PEGA) and 1,2-aminopropane (DPA) at 180 °C.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of water-soluble carbon nano-onions under alkaline conditions

Ahmed¹,

Badía‐Laiño²,

Calzón³

et al. 2016

Beilstein J. Nanotechnol.

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SummaryCarbonization of tomatoes at 240 °C using 30% (w/v) NaOH as catalyst produced carbon onions (C-onions), while solely carbon dots (C-dots) were obtained at the same temperature in the absence of the catalyst. Other natural materials, such as carrots and tree leaves (acer saccharum), under the same temperature and alkaline conditions did not produce carbon onions. XRD, FTIR, HRTEM, UV–vis spectroscopy, and photoluminescence analyses were performed to characterize the as-synthesized carbon nanomaterials. Preliminary tests demonstrate a capability of the versatile materials for chemical sensing of metal ions. The high content of lycopene in tomatoes may explain the formation of C-onions in alkaline media and a possible formation mechanism for such structures was outlined.

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Section: Introductionmentioning

confidence: 99%

Facile synthesis of water-soluble carbon nano-onions under alkaline conditions

Ahmed¹,

Badía‐Laiño²,

Calzón³

et al. 2016

Beilstein J. Nanotechnol.

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“…For example, 4-nitrophenol (4NP) has shown to quench GQDs in aqueous solutions 27 . In this context, we examined whether nitrocellulose-embedded GQDs strip irradiated by a simple LED and coupled only to a smartphone camera is able to provide a sensitive response to this type of pollutants.…”

Section: Resultsmentioning

confidence: 99%

Paper strip-embedded graphene quantum dots: a screening device with a smartphone readout

Álvarez-Diduk

Orozco

Merkoçi

2017

Sci Rep

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Simple, inexpensive and rapid sensing systems are very demanded for a myriad of uses. Intrinsic properties of emerging paper-based analytical devices have demonstrated considerable potential to fulfill such demand. This work reports an easy-to-use, low cost, and disposable paper-based sensing device for rapid chemical screening with a smartphone readout. The device comprises luminescent graphene quantum dots (GQDs) sensing probes embedded into a nitrocellulose matrix where the resonance energy transfer phenomenon seems to be the sensing mechanism. The GQDs probes were synthesized from citric acid by a pyrolysis procedure, further physisorbed and confined into small wax-traced spots on the nitrocellulose substrate. The GQDs were excited by an UV LED, this, is powered by a smartphone used as both; energy source and imaging capture. The LED was contained within a 3D-printed dark chamber that isolates the paper platform from external light fluctuations leading to highly reproducible data. The cellulose-based device was proven as a promising screening tool for phenols and polyphenols in environmental and food samples, respectively. It opens up new opportunities for simple and fast screening of organic compounds and offers numerous possibilities for versatile applications. It can be especially useful in remote settings where sophisticated instrumentation is not always available.

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“…The fluorescent CDs synthesized by thermal carbonization of ethyleneglycol bis-(2-aminoethyl ether)-N,N,N′,N′-tetraacetic acid (ETGA) and Tris were used to detect 4 NP [114]. The fluorescence of CDs was quenched by 4 NP due to the formation of the zwitterionic spirocyclic meisenheimer non-fluorescent complex via the energy transfer process (Fig.…”

Section: -Nitrophenol Detectionmentioning

confidence: 99%

Carbon dots: synthetic methods and applications as fluorescent probes for the detection of metal ions, inorganic anions and organic molecules

et al. 2015

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and biological materials. It has been found that fluorescent probes are one of the most successful approaches. Fluorescent probes such as organic molecules have the advantages of high sensitivity and fast analysis, but they suffer from low water solubility. Semiconductor quantum dots (QDs) can be used as fluorescent probes, while the issue of toxicity limits their practical applications [1,2]. Fluorescent carbon dots (CDs) with similar physicochemical properties of QDs and relatively low in toxicity and cost of synthesis are the most suitable alternatives to organic molecules and QDs [3]. CDs gradually become a rising star as fluorescent probes in a number of fields [4,5]. CDs, a new member of carbon nanomaterial family with diameter below 10 nm, have great fluorescent performance, excellent dispersity and biocompatibility [6,7]. The synthetic methods of CDs can be classified into top-down and bottom-up approaches [8].Top-down methods rely on reducing the size of the graphite-like structures until the products become fluorescent nanoparticles. In the bottom-up processes, anything with carbogenic nature can synthesize CDs under suitable conditions [9]. Always the synthetic strategies and the precursors affect the internal properties of the resulting nanoparticles such as the size, crystallinity, oxygen or nitrogen content, emission characteristics and compatibility with a particular solvent [10][11][12][13]. Particularly, with the advantages of great dispersibility in water and tunable fluorescence, CDs are also becoming attractive alternatives for novel fluorescence markers, fluorescent probes and optical probes [14,15].In this review, we mainly summarize the recent advances of CDs about the easy synthesises, sensitive fluorescent detections of ions and organic molecules and possible detection mechanisms. It is our aim that the synthesis of this knowledge will offer valuable insight and inspire research into the exciting areas. Some suggestions and an outlook are put forward about the applications of CDs.Abstract Carbon dots (CDs), a new class of fluorescent materials, have recently attracted considerable research interest. CDs have overcome some defects of traditional nanomaterial. In addition to their small size and optical properties, CDs have the excellent advantages of good biocompatibility and are easy to achieve surface functionalization. Since this discovery, CDs can be widely used in the field of biochemical sensing and environmental testing. This article reviews the progress in the research and development of CDs on their syntheses, applications for the fluorescence detection and possible mechanisms. Finally, we have an outlook of the research trends and future prospects of CDs.

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Highly fluorescent carbon dots as nanoprobes for sensitive and selective determination of 4-nitrophenol in surface waters

Cited by 91 publications

References 33 publications

Facile synthesis of water-soluble carbon nano-onions under alkaline conditions

Facile synthesis of water-soluble carbon nano-onions under alkaline conditions

Paper strip-embedded graphene quantum dots: a screening device with a smartphone readout

Carbon dots: synthetic methods and applications as fluorescent probes for the detection of metal ions, inorganic anions and organic molecules

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