Multifunctional fluorescent “Off-On-Off” nanosensor for Au3+ and S2− employing N-S co-doped carbon–dots

Sharma, Vinay; Kaur, Navdeep; Tiwari, Pranav; Saini, Anoop Kumar; Mobin, Shaikh M.

doi:10.1016/j.carbon.2018.07.004

Cited by 88 publications

(44 citation statements)

References 60 publications

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“…The system is sensitive to Cu 2+ ions over a concentration range of 2–80 × 10 −9 m , with a limit of detection of 1.8 × 10 −9 m . C dots prepared from rose petals with the addition of ethylenediamine as nitrogen‐dopant and cysteine as sulfur‐dopant were used to determine S 2− down to 92.4 × 10 −9 m based on the analyte induced fluorescence enhancement . Further addition of Au 3+ quenched the fluorescence of the C dots, which allowed detection of Au 3+ with LOD of 63.1 × 10 −9 m .…”

Section: Sensing and Imaging Applicationsmentioning

confidence: 99%

Recent Advances and Sensing Applications of Carbon Dots

2019

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Carbon dots (C dots) with biocompatibility, brightness, stability against photoirradiation and salt, and ease in preparation have become important materials for sensing and imaging. They can be prepared from natural materials and small organic molecules through hydrothermal, microwave‐assistant, and electrochemical methods, with advantages of simplicity and low cost. To enhance the quantum yields of C dots in the red and near‐infrared regions, doping of C dots with heteroatoms such as nitrogen and sulfur has been suggested. C dots both with and without being functionalized recognition elements such as antibodies and aptamers are selective and sensitive for sensing of analytes, including metal ions (e.g., Fe3+, Hg2+, Cu2+), small molecules (e.g., H2O2, cysteine, glutathione), and biopolymers like proteins, as well as for in vitro and in vivo imaging. Depending on the size, charge, and surface ligands of C dots used to label cells, fluorescence images of different organelles are shown. Multicolor images of bacteria, mammalian cells, and plant tissues incubated with C dots are realized when excited at different wavelengths. In this review, many excellent sensing and imaging examples of C dots are presented to highlight their features and to show their challenges for analytical applications.

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Section: Sensing and Imaging Applicationsmentioning

confidence: 99%

Recent Advances and Sensing Applications of Carbon Dots

2019

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“…Peaks in the range of 170-180 ppm, which correspond to carboxyl/amide groups, were seen in the spectrum of the N-S@RCD samples. 2,3 To support the explanations derived from 1D NMR, 2D NMR homo ( 1 H/ 1 H) and hetero ( 13 C/ 1 H) correlation were studied with the help of HMBC and COSY NMR, respectively, for RE, NSR-1 h/ 2 h/3 h/4 h and N-S@RCD samples (Fig. 3).…”

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confidence: 95%

Bioinspired carbon dots: from rose petals to tunable emissive nanodots

2019

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“…The fluorescence switching behavior of CBCDs in the presence of Fe 3+ and AA can be employed as multiple molecular logic gates, performing the Boolean algebraic logic operations. 62 The simple single input molecular logic gate NOT can be constructed using Fe 3+ as single input signal ( Figure 7 a). The multiple input logic gate IMPLICATION can be realized by taking Fe 3+ and AA as input 1 and input 2, respectively.…”

Section: Resultsmentioning

confidence: 99%

Facile Conversion of Toxic Cigarette Butts to N,S-Codoped Carbon Dots and Their Application in Fluorescent Film, Security Ink, Bioimaging, Sensing and Logic Gate Operation

Devulapalli²,

et al. 2018

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The present work is emphasized on converting toxic cigarette butts (CBs) into highly fluorescent N,S-codoped carbon dots by a facile hydrothermal approach and exploring their multiple applications. The as-produced carbon dots (CBCDs) exhibited bright and stable fluorescence with a quantum yield of 26% and used as a label-free probe for “on–off–on” sequential detection of Fe3+ and ascorbic acid (AA). The fluorescence of CBCDs can be significantly quenched by Fe3+ ions through static quenching and restored upon the subsequent addition of AA due to the reduction of Fe3+ to Fe2+ by AA. This nanoprobe presented great selectivity and excellent sensitivity to Fe3+ and AA with a detection limit of 0.13 and 0.2 μM, respectively. Furthermore, the nanoprobe was extended to biosystem (intracellular detection) and successfully applied for the detection of Fe3+ in real water (tap, bore, and pond) and AA in biological samples (human urine and serum). In addition, we have constructed an IMPLICATION logic gate based on these unique sensing characteristics. The “visible–invisible” and “UV–visible” property explored their use as invisible ink for security applications. Furthermore, highly photostable fluorescent polymer films were prepared by incorporating CBCDs in poly(vinyl alcohol). It is anticipated that the strong and stable fluorescence emission nature of these films might find direct or indirect applications in various optical/optoelectronic devices, ranging from fluorescent displays to light-emitting diodes.

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Multifunctional fluorescent “Off-On-Off” nanosensor for Au3+ and S2− employing N-S co-doped carbon–dots

Cited by 88 publications

References 60 publications

Recent Advances and Sensing Applications of Carbon Dots

Recent Advances and Sensing Applications of Carbon Dots

Bioinspired carbon dots: from rose petals to tunable emissive nanodots

Facile Conversion of Toxic Cigarette Butts to N,S-Codoped Carbon Dots and Their Application in Fluorescent Film, Security Ink, Bioimaging, Sensing and Logic Gate Operation

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