Synthesis of carbon nanoparticles using one step green approach and their application as mercuric ion sensor

Roshni, V.; Ottoor, Divya

doi:10.1016/j.jlumin.2014.12.048

Cited by 58 publications

(28 citation statements)

References 39 publications

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“…The photoluminescence mechanism of C.dots is still not clear but there are reports about the role of quantum confinement and existence of surface energy traps on the C.dots surface 32 . It was found earlier that the dependence of C.dot fluorescence on its size is limited, ruling out C.dot fluorescence as size-dependent phenomenon 33 . Fluorescence emission of C.dots is recorded at different pH medium (Figure 4 a).…”

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confidence: 95%

One-Step Microwave-Assisted Green Synthesis of Luminescent N-Doped Carbon Dots from Sesame Seeds for Selective Sensing of Fe(III)

Roshni¹,

Divya²

2017

Current Science

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The present study focuses on the green synthesis of nitrogen-doped carbon dots (C.dots) from sesame seeds using microwave pyrolysis method. The C.dots obtained were characterized and extensively studied using transmission electron microscopy (TEM), UV/ visible spectroscopy, fluorescence spectroscopy and Fourier transform infra-red spectroscopy (FTIR) techniques. The results indicated the presence of highly fluorescent, aqueous soluble and significantly photostable C.dots with a quantum yield of 8.02%. The average size distributions of C.dots were found to be 5 nm. These C.dots were effectively applied as a selective sensor for Fe(III) as the fluorescence intensity was significantly quenched with increasing metal concentrations. The limit of detection (LOD) was found to be 2.56 M of Fe(III). This study demonstrates a low cost, environmental friendly and waste recyclable synthetic method for preparation of C.dots and its application as a selective Fe(III) sensor.Keywords: Carbon dots, fluorescence, sesame seeds, microwave pyrolysis, metal ions, quenching.CARBON DOTS (C.dots) are gaining increasing attention within the carbon nanomaterial family due to their varied applications in biological, sensing, optical and electrical fields 1-3 . They are swiftly replacing the conventional semiconductor nanoparticles (Q.dots) which have raised serious health and environmental concerns because of the presence of heavy metals in it 4 . C.dots are spherical, oxygenous carbon nanoparticles with size below 10 nm. C.dots akin to Q.dots show several interesting properties such as excitation-dependent emission, chemical and photostability, enhanced fluorescence quantum yields and the possibility of fine-tuning the sensing properties by surface modification [5][6][7][8][9][10][11] In order to improve the photophysical and photochemical properties of C.dots, hetero-atom doped C.dots are synthesized by different ways. Among them, nitrogendoped C.dots received much attention because of their good biocompatibility and the related broad applications in the areas of bio-imaging, electrocatalysis and sensors 25,26 . However, most of the synthesis methods reported so far have either a long reaction time or a need of extra chemicals for doping. Thus, synthesizing Ndoped C.dots in a cost effective and ecofriendly manner and using them for sensing applications, especially for biologically active and environmentally hazardous metal ions will be highly beneficial.Iron is an essential element for many biological processes 27 . The presence of iron in body either at higher levels or at lower levels can lead to several problems which eventually disturbs the lipid metabolism and glucose levels 28 . Therefore, quantitative determination of bioactive iron is an important health care challenge. Some studies have already been reported in this direction; Qian et al. 29 used the N-doped C.dots for detection of Fe(III). Wang et al. 30 used a wide variety of green carbonaceous precursors like milk, silk, honey, hair, lemon, etc. to detect Fe(III).The pre...

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confidence: 95%

One-Step Microwave-Assisted Green Synthesis of Luminescent N-Doped Carbon Dots from Sesame Seeds for Selective Sensing of Fe(III)

Roshni¹,

Divya²

2017

Current Science

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“…"top-down" [12][13][14] and "bottom-up" [15][16][17] [19][20][21][22][23], anion [24], biomolecule [25][26][27][28], and pollutants [29][30]. To the best of our knowledge, CDs used as a sensitive fluorescence probes for "Off-On" sensing SDBS has not been reported yet.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Carbon dots as fluorescent probe for “off–on” Detecting sodium dodecyl-benzenesulfonate in aqueous solution

Tao

Liao²,

et al. 2016

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…It may be pointed out that recently it has been reported that coconut milk when heated to 150-160 8C leads to formation of carbon quantum dots with size of few nm. 21 It has also been reported that nano particles of silver can be generated with the use of coconut water. 22 The control of particle size of Y 2 O 3 :Eu 31 with coconut water assisted sol-gel process has also been reported.…”

Section: Introductionmentioning

confidence: 99%

“…The treatment of FA with CW was taken up not for dispersing the filler but for size reduction. It may be pointed out that recently it has been reported that coconut milk when heated to 150–160 °C leads to formation of carbon quantum dots with size of few nm . It has also been reported that nano particles of silver can be generated with the use of coconut water .…”

Section: Introductionmentioning

confidence: 99%

Melt rheological studies of polypropylene filled with coconut water treated and untreated fly ash

Radhakrishnan¹,

Kulkarni²,

Samarth

et al. 2016

J of Applied Polymer Sci

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The melt rheology of polypropylene (PP) filled with fly ash (FA) before and after treatment with coconut water (CW) was studied for different concentration of the filler. The fly ash after coconut water treatment clearly showed additional peaks in the infrared (IR) spectra corresponding to the hydroxyl and carbonyl groups indicating good adsorption of CW on FA. The X‐ray diffraction of melt compounded PP filled with CW‐treated (CWT) FA showed large reduction of the main silica peak of FA and considerable broadening of Mullite and hematite peaks suggesting formation of fine particles by this treatment. Scanning electron microscopy (SEM) confirmed the drastic reduction of particle size in these composites. The melt rheological studies for these composites indicated considerable increase in viscosity at low filler loading for CW treated FA. The concentration dependence of melt viscosity did not follow any of the theoretical equations suggested in literature. Although, the behavior was similar to nanoparticle‐filled polymers, there were some differences especially above the critical concentration of 4.5% by volume. The frequency dependence of storage and loss modulus indicated crossover point clearly, which was greatly affected by CW treatment. The Cole–Cole plots of real and imaginary part of melt viscosity brought out the broad distribution of relaxation time for the CW treated FA. The CW treated FA melt compounded with PP gave rise to nanocomposites with uniform dispersion. However, above 4.5% by volume, there appears to be agglomerate formation along with a thin interfacial layer, which assists the melt flow even at high filler loading. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43900.

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Synthesis of carbon nanoparticles using one step green approach and their application as mercuric ion sensor

Cited by 58 publications

References 39 publications

One-Step Microwave-Assisted Green Synthesis of Luminescent N-Doped Carbon Dots from Sesame Seeds for Selective Sensing of Fe(III)

One-Step Microwave-Assisted Green Synthesis of Luminescent N-Doped Carbon Dots from Sesame Seeds for Selective Sensing of Fe(III)

Carbon dots as fluorescent probe for “off–on” Detecting sodium dodecyl-benzenesulfonate in aqueous solution

Melt rheological studies of polypropylene filled with coconut water treated and untreated fly ash

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