Green synthesis of nitrogen-doped fluorescent carbon quantum dots for selective detection of iron

Tan, Hong-chen; Zhao, Wenhua; Qiu, Qi; Zhang, Rui; Zuo, Yang-yang; Yang, Lijun

doi:10.1080/1536383x.2017.1326102

Cited by 19 publications

(4 citation statements)

References 29 publications

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“…Some groups employed organic carbon source as the precursor and rare earth metal ion or transition-state ion as the dopant to prepare D/M-CDs. − It is worth mentioning that Chen et al synthesized the recessive dual-emission CD (D-CD)-doped terbium(III) which only shows a single peak without an analyte; however, the analyte can transfer energy to terbium ion through nonradiative transition, effectively sensitizing the luminescence of rare earth ion, which is the antenna effect . Some other research groups pyrolysised special organic precursors such as corn bract, lycium barbarum, oxidized coal, or naked oats and added other compounds as dopants to modify CDs. Hu et al proposed the distinct green and yellow peaks originated from the N-containing groups and P-containing groups, respectively .…”

Section: Introductionmentioning

confidence: 99%

Origins of Efficient Multiemission Luminescence in Carbon Dots

et al. 2019

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Although several groups have synthesized dual-emission carbon dots (D-CDs) and paid more attention to their emission centers in recent years, the luminescence mechanism of D-CDs is still unclear. Here, we synthesized multiemission CDs via the one-pot hydrothermal method. The prepared CDs exhibit three fluorescence (FL) emissions (370, 425, and 505 nm) under one-wavelength excitation of 320 nm. In addition, various emission origins dominate the unique multiemission property, which is illuminated by means of the radiation decay process, CD internal graphite domains, and abundant functional group characterization. The characterization results fully indicate that there are three energy states: band gap state (carbon-core state), surface defect state, and molecular state. In addition, the peculiar concentration-dependent and polarity-modulated properties further support the explanation of CD multienergy states. Strikingly, the CD FL quantum yield is up to 50.68%. As CDs can show bright green FL excited over 400 nm, the color of concentrated CD solution incredibly turns from maroon to green in visible light observed from different angles. Our findings mainly account for this luminescence mechanism of CDs. This work utilizes time-resolved emission spectra for the first time to distinguish and identify multiemission origins, which would provide scientific inspiration for finding effective ways to regulate or control these luminescence processes.

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Section: Introductionmentioning

confidence: 99%

Origins of Efficient Multiemission Luminescence in Carbon Dots

et al. 2019

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“…Excitation-dependence is expected to play a role in multicolor imaging or LEDs [5,6]. In addition, CDs are considered to be detectable in response to some metal ions (Fe, Ag, and Hg) or pH due to their rich functional groups on their surface [7,8,9,10]. Therefore, CDs can be used as fluorescent probes for the detection of trace elements or pH in the environment or human body.…”

Section: Introductionmentioning

confidence: 99%

Highly Fluorescent Green Carbon Dots as a Fluorescent Probe for Detecting Mineral Water pH

Wang

2019

Sensors

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In this report, high-brightness green carbon dots were successfully prepared using 3,5-diaminobenzoic acid as the sole precursor and synthesized in one step using a solvothermal strategy. Under the excitation of 365 nm ultraviolet light, the quantum yield of carbon dots is as high as 53.8%. Experiments revealed that the carbon dots are highly carbonized and the surface is rich in amino and carboxyl groups. The synthesized carbon dots have good water solubility, and are resistant to ions and temperature. The fluorescence intensity of CDs is sensitive to pH changes and is linearly correlated with the pH in the near-neutral range (pH = 6.0 to 9.0). Our experiments showed that carbon dots were sensitive and accurate fluorescent probes for measuring the pH value of drinking water, which could provide an effective method for measuring the pH value of water in the future.

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“…At present, the determination methods of Cr(VI) concentration mainly include complex metric titration, electrochemical analysis, high-performance liquid chromatography, ion chromatography, atomic absorption spectrometry, and mass spectrometry. , Although these methods are sensitive, they have disadvantages such as a cumbersome pretreatment process for the sample to be tested, the inability of miniaturizing the detection instrument, and inability to perform time-resolved measurements . Compared with this method, the fluorescent probe method has the advantages of simple sample pretreatment, fast response, wide linear dynamic range, less spectral interference, and high sensitivity and has become a common analytical method for the rapid detection of metal ions. − Among the fluorescent probes, carbon quantum dot fluorescent probes are easy to synthesize and cost less and their fluorescence can be adjusted. The application of carbon quantum dots (referred to as CQDs) in the field of Cr(VI) detection has become a research hotspot at home and abroad in recent years. − At present, various precursors have been employed to prepare CQD, including carbon-based materials, synthetic chemicals, plant extracts, and animal byproducts. − …”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Luffa Sponge Activated Carbon Fiber Based Carbon Quantum Dots with Green Fluorescence and Their Application in Cr(VI) Determination

Luo

Zhou

et al. 2020

ACS Omega

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Carbon quantum dots (CQDs) were prepared by a chemical oxidation method using luffa sponge based activated carbon fiber as the raw material. The obtained CQDs were well characterized. The fluorescence quenching effect of Cr(VI) ion on CQDs was investigated. The results show that the addition of Cr(VI) changes the intensity of the ultraviolet characteristic absorption peak of CQDs, and causes static quenching of the fluorescence of CQDs. With the increase in the Cr(VI) concentration, the fluorescence of CQDs was gradually extinguished linearly.

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Green synthesis of nitrogen-doped fluorescent carbon quantum dots for selective detection of iron

Cited by 19 publications

References 29 publications

Origins of Efficient Multiemission Luminescence in Carbon Dots

Origins of Efficient Multiemission Luminescence in Carbon Dots

Highly Fluorescent Green Carbon Dots as a Fluorescent Probe for Detecting Mineral Water pH

Facile Synthesis of Luffa Sponge Activated Carbon Fiber Based Carbon Quantum Dots with Green Fluorescence and Their Application in Cr(VI) Determination

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