An efficient “off–on” carbon nanoparticle-based fluorescent sensor for recognition of chromium(<scp>vi</scp>) and ascorbic acid based on the inner filter effect

Li, Pingjing; Hong, Yayu; Feng, Hai; Li, Sam Fong Yau

doi:10.1039/c7tb00017k

Cited by 77 publications

(29 citation statements)

References 27 publications

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“…As such, the detection mechanism is due to the fluorescence IFE with Cr(VI), on one hand shielding the excitation light for N , Cl -CDs, and on the other hand absorbing the emission light from N , Cl -CDs. This kind of IFE-based fluorescence quenching sensor has also been designed by other researchers for the detection of Cr(VI) [ 21 , 30 , 42 ]. In comparison with the fluorescence resonance energy transfer (RET) method, the IFE process has no covalent bonds between an absorber–fluorophore pair [ 43 ].…”

Section: Resultsmentioning

confidence: 99%

“…In comparison with the fluorescence resonance energy transfer (RET) method, the IFE process has no covalent bonds between an absorber–fluorophore pair [ 43 ]. The IFE-based sensing method could provide enhanced sensitivity and fast response as the changes in the absorbance of N , Cl -CDs could lead to an exponential decrease of the fluorescence intensity [ 30 ]. In our work, the IFE process between N , Cl -CDs and Cr(VI) could occur in a fast and sensitive way with a response time of ≤1 min.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, CD-based sensors [ 22 , 27 ] have attracted much attention in Cr(VI) detection due to their advantages in low cost, favorable selectivity, and ease of miniaturization. So far, a bunch of CDs have been developed for Cr(VI) recognition with high selectivity and sensitivity; however, most of the preparation procedures for CDs require external heat and long heating time to achieve the carbonization of carbon source [ 28 , 29 , 30 , 31 ], and some of the reported methods were only performed in the preliminary test stage with no real sample application employed [ 28 , 29 ]. As such, the development of a simple, fast, and energy-efficient synthetic route to produce highly selective and sensitive CDs with the capability for Cr(VI) detection in real samples is highly desirable.…”

Section: Introductionmentioning

confidence: 99%

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Ultrafast and Energy-saving Synthesis of Nitrogen and Chlorine Co-doped Carbon Nanodots via Neutralization Heat for Selective Detection of Cr(VI) in Aqueous Phase

Gao

et al. 2018

Sensors

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In this work, it is presented for the first time that nitrogen and chlorine co-doped carbon nanodots (N,Cl-CDs) were synthesized by simply mixing glucose, concentrated hydrochloric acid (HCl), and 1,2-ethylenediamine (EDA). No external heat was employed; the neutralization reaction served as the heat source. The glucose served as the carbon source while EDA and HCl were the N and Cl dopants, respectively. The fluorescence of N,Cl-CDs was adequately quenched by hexavalent chromium Cr(VI) based on a combination of dynamic quenching and inner filter effect (IFE). Accordingly, an efficient N,Cl-CDs-based fluorescence probe was established for sensitive and selective detection of Cr(VI). The proposed fluorescence sensor provides a linear recognition range for Cr(VI) determination from 3 to 40 µM with a limit of detection (LOD) of 0.28 µM (14.6 µg/L). The proposed fluorescence method was successfully utilized to detect Cr(VI) in different water samples with satisfactory results. The spike recoveries vary from 97.01% to 103.89% with relative standard deviations (RSDs) of less than 0.82%. This work highlights the development of a simple, ultrafast, and energy-saving one-step synthetic route to fabricate N,Cl-CDs for highly selective and sensitive detection of Cr(VI) in real water samples. It is anticipated that the proposed fluorescence method could be further explored and widely used for Cr(VI) detection in the environmental industry.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ultrafast and Energy-saving Synthesis of Nitrogen and Chlorine Co-doped Carbon Nanodots via Neutralization Heat for Selective Detection of Cr(VI) in Aqueous Phase

Gao

et al. 2018

Sensors

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“…Fluorescent carbon‐based materials, including carbon quantum dots (CDs), carbon nanodots (CNs), fluorescent carbon nanoparticles and fluorescent graphene etc., have drawn sustained attention in recent years due to their advantages of having excellent photoluminescence (PL) properties, superior chemical stability, biocompatibility, low toxicity and inexpensive and simple preparation methods . Typically, CNs consist of discrete and quasi‐spherical nanoparticles with sizes in the range of several to dozens of nanometers .…”

Section: Introductionmentioning

confidence: 99%

UV light‐tunable fluorescent inks and polymer hydrogel films based on carbon nanodots and lanthanide for enhancing anti‐counterfeiting

et al. 2019

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Novel water-soluble green fluorescent carbon nanodots (CNs) using methacrylic acid and m-phenylenediamine as precursors were first synthesized using a onepot hydrothermal method. Red fluorescent lanthanide complexes were prepared using lanthanide ion Eu 3+ and pyridine-2,6-dicarboxylic acid. The optical properties of CNs were characterized using ultraviolet visible (UV) spectra and fluorescence spectra, microscopic morphology was characterized using transmission electron microscopy (TEM) and dynamic light scattering (DLS), and the elemental composition was characterized using Fourier transform-infrared spectroscopy (FT-IR) and X-ray photoelectron spectra (XPS). The fluorescence spectra of the lanthanide complexes were also measured. A simple strategy was developed to prepare UV light-tunable fluorescent inks and polymer hydrogels films based on CNs and lanthanide complexes. The fluorescent inks and polymer hydrogels films could be repeatedly switched between green and red fluorescence. The change of color depended on luminescence of the CNs and the lanthanide complexes under 254 and 365 nm UV light, respectively. The UV light-tunable fluorescent inks and polymer hydrogels films could enhance its anti-counterfeiting function for data and information.

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“…During the past few years, carbon dots (CDs) have become more popular and are regarded as a rising star of the “luminescent material family” . In addition, CDs have many advantages, such as low toxicity, high water solubility, high stability, and good biocompatibility, and are easy to functionalize .…”

Section: Introductionmentioning

confidence: 99%

One‐Pot Synthesis of Highly Fluorescent Carbon Dots from Spinach and Multipurpose Applications

et al. 2018

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Highly fluorescent carbon dots (CDs) have been prepared from natural spinach by a hydrothermal method. In this work, we have demonstrated that the CDs have a high quantum yield of 53 %, and exhibit special responses to 2-nitrophenol (2-NP) and 4-nitrophenol (4-NP). Solutions of the CDs showed clear fluorescence quenching in the presence of 2-NP and 4-NP; the detection limits of 2-NP and 4-NP were 1.06 and 0.50 μM,

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An efficient “off–on” carbon nanoparticle-based fluorescent sensor for recognition of chromium(vi) and ascorbic acid based on the inner filter effect

Abstract: A simple approach based on calcination treatment of diethylenetriaminepentaacetic acid (DTPA) was developed to prepare water-soluble nitrogen doped carbon nanoparticles (N-CNPs) with a high quantum yield of approximately 53.7%.

Cited by 77 publications

References 27 publications

Ultrafast and Energy-saving Synthesis of Nitrogen and Chlorine Co-doped Carbon Nanodots via Neutralization Heat for Selective Detection of Cr(VI) in Aqueous Phase

Ultrafast and Energy-saving Synthesis of Nitrogen and Chlorine Co-doped Carbon Nanodots via Neutralization Heat for Selective Detection of Cr(VI) in Aqueous Phase

UV light‐tunable fluorescent inks and polymer hydrogel films based on carbon nanodots and lanthanide for enhancing anti‐counterfeiting

One‐Pot Synthesis of Highly Fluorescent Carbon Dots from Spinach and Multipurpose Applications

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