Silver ion-doped CdTe quantum dots as fluorescent probe for Hg2+ detection
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In this paper, CdTe quantum dots (QDs) are used as a fluorescence probe for Hg2+ detection and two linear relationships were obtained for the plot of F/F0 against Hg 2+ concentration, enlarging the detection concentration range of Hg.Abstract:
Mercury(II), which is a well-known toxic species, exists in the industrial waste water in many cases. In the present work, CdTe quantum dots (QDs) are studied as a fluorescence probe for Hg2+ detection. Ag ions are induced to QDs to enlarge their detection concentration range. L-cysteine is employed in the QD-based fluorescence probe to connect QDs with Hg2+. X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy results indicate the formation of zinc blende CdTe QDs with sizes of ∼5 nm and the existence of Ag+ in crystalline CdTe. Photoluminescence (PL) spectra and PL decay spectra were acquired to investigate the emission mechanism of Ag-doped CdTe QDs, revealing multi-emission in QD samples with higher concentrations of Ag+ doping. The highest PL quantum yield of the QD samples was 59.4%. Furthermore, the relationship between the fluorescence intensity and the concentration of Hg2+ has been established. Two linear relationships were obtained for the plot of F/F0 against Hg2+ concentration, enlarging the detection concentration range of Hg2+.read more
Citations
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Optical and dielectric investigations on Ag: CdZnTe hybrid polyvinyl alcohol freestanding films
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Optical and dielectric investigations on Ag: CdZnTe hybrid polyvinyl alcohol freestanding films
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TL;DR: In this paper, the effect of varying silver concentration on optical and dielectric properties of polyvinyl alcohol with CdZnTe quantum dots was studied. But the effect on optical properties was not considered.
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Highly fluorescent nitrogen-doped carbon dots derived from Phyllanthus acidus utilized as a fluorescent probe for label-free selective detection of Fe 3+ ions, live cell imaging and fluorescent ink.
Raji Atchudan,Thomas Nesakumar Jebakumar Immanuel Edison,Kanikkai Raja Aseer,Suguna Perumal,Namachivayam Karthik,Yong Rok Lee +5 more
TL;DR: It is proved that synthesized FNCDs has durable fluorescence, soluble in water very well and thus act as a promising candidate for the diverse applications such as label-free sensitive and selective detection of Fe3+, fluorescent ink and cellular imaging with good biocompatibility and low cytotoxicity.