Long wavelength emission multicolor fluorescent carbon quantum dots for the detection of pH, amino acids, and metal ions
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Carbon Quantum Dots
Carbon fibers
Carbon Quantum Dots
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Abstract CdTe nanocrystals as fluorescent sensors for Hg2+ ions were synthesized. These nanocrystals were highly sensitive for Hg2+ ions and the selectivity was found to be Hg2+ > Cu2+ > other representative heavy metal ions. Moreover, they bear the following merits. First, they are easily synthesized; second, they have a narrow, tunable, symmetric emission spectrum.
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The interactions of Hemoglobin (Hb) with different metal ions were studied by fluorescent spectra.It showed that Zn 2+ can improve the fluorescent intensity of Hb,Cu 2+ can quench fluorescence of Hb,and Ag + can quench weakly fluorescence of Hb.When the mixed ions was added into Hb solution, the spectra of Hb revealed obvious difference between separate ion and mixed ions, which resulted in competitive coordination effect or synergetic effect in the coexistent ions system.
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The selective recognition of metal ions is very important and the development of novel chemosensor is still a challenge. Herein, a single dual-emissive fluorescence probe was developed to detect Fe3+ and phytic acid (PA). Red quantum dots (CdSe) were embedded into silica nanoparticles for an internal standard emission, whereas blue carbon dots (CDs) were covalently linked onto the surface of silica as a sensing element to achieve a more precise and sensitive detection. The fluorescence of the CDs was effectively quenched by Fe3+ via a photoinduced electron transfer (PET) process. Fe3+ could selectively bind to phytic acid, thus leading to the recovered fluorescence of the CDs in the presence of Fe3+. Upon addition of PA to the CdSe@SiO2-CDs/Fe(III) complex dispersion, the fluorescence of the CDs significantly increased. The ratiometric probe enabled the selective detection of PA within 0.08-1.6 mM and a limit of detection of 1.5 μM. Overall, this method provided high selectivity, stability, and recovery ratio in the detection of Fe3+ and PA.
Carbon Quantum Dots
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As a kind of fluorescent nano material with good optical properties and low toxicity, carbon quantum dots have been developed into a new type of fluorescent probe, which can be used for the detection of heavy metal pollution in the environment. At present, the synthesis methods of carbon quantum dots have been mature, but the research reports on the factors affecting the fluorescence properties of carbon quantum dots are few. This paper, starting from the structure of the carbon quantum dots, focuses on the fluorescence characteristics of the dots, discusses the factors affecting the fluorescence performance of the dots, and compares the methods to improve the fluorescence intensity of the dots. The environmental application of carbon quantum dots is analyzed and prospected.
Carbon Quantum Dots
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A new coumarin derivative L was synthesized and characterized by 1 H NMR, 13 C NMR, IR and mass spectrum. UV-Vis and fluorescence emission spectra of L without or with different anions (NO 2 , F, Cl, HSO 3 , HSO 4 , AcO or NO 3 ) or metal ions were measured, which showed while addition of anions or metal ions Mg 2+ , Zn 2+ , Ca 2+ , Cu 2+ , Ni 2+ , Co 2+ , Fe 3+ or Al 3+ led to decrease in intensity of the maximum emission peak at about 480 nm, addition of Hg 2+ ions caused increase in intensity of the maximum emission peak, suggesting that L may act as a fluorescent probe for detection of Hg 2+ ions.
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Proton NMR
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Simple, accurate and real-time analytical methods are required for the detection of metal ions in a complex environment. In the present work, a fluorescent probe CPB based on coumarin was designed for recognizing Cu2+ ions. The fluorescence of CPB gradually quenched with increasing concentration of Cu2+ ions, due to the interactions between CPB and Cu2+ ions. With the addition of Cu2+ ions, the emission changes of CPB exhibited a good liner relationship toward the Cu2+ ions content in solution. Additionally, CPB could highly selective recognize Cu2+ ions among other metal ions in solution. Bearing the selectivity and fluorescence property toward Cu2+ ions, CPB was successfully applied to monitoring Cu2+ ions in Hela cells and zebrafish.
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The effect of concentration, pH and metallic ions(Zn~(2+) and Cd~(2+)) on fluorescence properties of 2-hydroxo-1-naphthaldehyde p-methoxyl-benzoylhydrazone was investigated. The effect of the concentration of different metallic ions on fluorescent intensity of the complex was studied in details. The results indicate that the fluorescent intensity and position of the system changed with the addition of the metallic ions. The presence of Zn(Ⅱ) and Cd(Ⅱ) can enhance the florescent intensity of the system. The coordination modes of acylhydrazone compound were studied by the variation of the fluorescent property. Relationship of fluorescent intensity and its structure was discussed preliminarily. The investigation of different proportion of metallic ions on fluorescent intensity show that the florescent intensity increased with its proportion increasing in certain range, and decreased with the concentration increasing when the concentration exceeded the range.
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