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Synthesis of Fluorescent CdS Quantum Dots of Tunable …

63. Costa-Fernández JM, Pereiro R, Sanz-Medel A. The use of luminescent quantum dots for optical sensing. 2006;25:207-18

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Synthesis and characterization of CdS quantum dots …

Apart from the delivery of conventional, small molecule drugs, quantum dots/rods have also been shown to have promise for delivery of more complex biomolecules, such as short interfering RNA (siRNA).[] These short and double-stranded therapeutic RNA molecules function by blocking the expression of undesirable, disease-causing genes. However, in their free form they have high negative charge and are vulnerable to degradation in physiological fluids. Therefore, for optimal function and vivo, they must be delivered via electrostatic complexation with cationic nanocariers. Quantum dots/rods, appropriately surface functionalized with cationic moieties, are ideal siRNA carriers as they not only render these genetic drugs with physiological stability and target specificity, but also the whole complex (nanoplex) can be optically traced.

Thiolated selenium as a new precursor for the aqueous synthesis of CdSe/CdS core/shell quantum dots

Near-infrared (NIR) fluorescence imaging at wavelengths from 1000 to 1500 nm (2nd-NIR window) is a promising modality for in vivo fluorescence imaging because of the deeper tissue penetration with lower tissue scattering of the 2nd-NIR light. For such in vivo fluorescence imaging, highly fluorescent probes in the 2nd-NIR wavelength region are needed. Although single-walled carbon nanotubes and Ag2S quantum dots (QDs) have recently appeared as 2nd-NIR fluorescent probes, their fluorescence brightness is relatively low (quantum yields

Aqueous synthesis of CdSe and CdSe/CdS quantum dots …

65. Jamieson T, Bakhshi R, Petrova D, Pocock R, Imani M, Seifalian AM. Biological applications of quantum dots.  2007;28:4717-32

Quantum dots are an excellent resource for demonstrating quantum phenomena. Two new methods for synthesizing quantum dots are presented. Proceeding at relatively low reaction temperatures, these exercises are safe and easy to conduct in an undergraduate student laboratory. The quantum dots prepared from the first method exhibited visible luminescence across a broad range of colors. The size-dependent spectral properties of quantum dots were examined quantitatively in the second method. Following this procedure, students in an advanced chemistry laboratory course synthesized their own quantum dots and gained experience with these important nanomaterials.

We use a simple device architecture based on a poly(3,4-ethylendioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)-coated indium tin oxide anode and a LiF/Al cathode to assess the effects of shell thickness on the properties of light-emitting diodes (LEDs) comprising CdSe/CdS core/shell nanocrystal quantum dots (NQDs) as the emitting layer. Specifically, we are interested in determining whether LEDs based on thick-shell nanocrystals, so-called “giant” NQDs, afford enhanced performance compared to their counterparts incorporating thin-shell systems. We observe significant improvements in device performance as a function of increasing shell thickness. While the turn-on voltage remains approximately constant for all shell thicknesses (from 4 to 16 CdS monolayers), external quantum efficiency and maximum luminance are found to be about one order of magnitude higher for thicker shell nanocrystals (≥13 CdS monolayers) compared to thinner shell structures (2, respectively, with a remarkably low turn-on voltage of ∼3.0 V.

Synthesis of CdS quantum dots by mechanochemical reaction

Polystyrene microbeads doped with highly luminescent CdS quantum dots (QDs) have been prepared

A direct conjugation of organophosphorus acid anhydrolase (OPAA) with CdS quantum dots was prepared via arrested precipitation within the enzyme matrix. The bio-conjugate was found not only to retain enzyme conformational structure but also to retain enzyme activity and be effective at detecting diisopropyl fluorophosphate (DFP) at the micro molar level.

N2 - A direct conjugation of organophosphorus acid anhydrolase (OPAA) with CdS quantum dots was prepared via arrested precipitation within the enzyme matrix. The bio-conjugate was found not only to retain enzyme conformational structure but also to retain enzyme activity and be effective at detecting diisopropyl fluorophosphate (DFP) at the micro molar level.

Synthesis of radioactively labelled CdSe/CdS/ZnS quantum dots for in vivo experiments
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  • Characterization of CdS and ZnS Quantum Dots …

    Quantum dots synthesized ..

  • Synthesis of CdS quantum dots in an imidazolium …

    Quantum dots sometimes ..

  • Synthesis of CdS quantum dots in an imidazolium based ionic liquid

    The synthesis of CdS and ZnS quantum dots via a chemical route is reported

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to synthesize CdS quantum dots ..

AB - Near-infrared (NIR) fluorescence imaging at wavelengths from 1000 to 1500 nm (2nd-NIR window) is a promising modality for in vivo fluorescence imaging because of the deeper tissue penetration with lower tissue scattering of the 2nd-NIR light. For such in vivo fluorescence imaging, highly fluorescent probes in the 2nd-NIR wavelength region are needed. Although single-walled carbon nanotubes and Ag2S quantum dots (QDs) have recently appeared as 2nd-NIR fluorescent probes, their fluorescence brightness is relatively low (quantum yields

An easy low-temperature synthesis of CdS quantum dots

Mahajan et al have used an attractive approach where drug delivery has been integrated with site-specificity using a QD-based platform []. Specifically, the antiretroviral drug saquinavir and the biorecognition molecule transferrin (Tf) have been conjugated to carboxyl-terminated quantum dots using carbodiimide chemistry. The aim of this study was to significantly enhance the transport of saquinavir into the brain, for the treatment of HIV-1 infected cells within the brain, via targeting the transferrin receptors (TfRs), which are overexpressed on the apical surface of the blood brain barrier (BBB). Using an model of the BBB, they demonstrated that these targeted and drug-doped QDs can efficiently cross the BBB, and caused a marked decrease in viral replication in the HIV-1 infected peripheral blood mononuclear cells (PBMCs) within the brain. These results highlight the potential of this nanoformulation in the treatment of Neuro-AIDS and other neurological disorders.

Biomanufacturing of CdS quantum dots - Green …

N2 - Near-infrared (NIR) fluorescence imaging at wavelengths from 1000 to 1500 nm (2nd-NIR window) is a promising modality for in vivo fluorescence imaging because of the deeper tissue penetration with lower tissue scattering of the 2nd-NIR light. For such in vivo fluorescence imaging, highly fluorescent probes in the 2nd-NIR wavelength region are needed. Although single-walled carbon nanotubes and Ag2S quantum dots (QDs) have recently appeared as 2nd-NIR fluorescent probes, their fluorescence brightness is relatively low (quantum yields

How to synthesis CdS Quantum Dots? - ResearchGate

This paper describes a convenient and rapid fluorescence sensor for determination of paraquat (PA) based on glutathione-capped CdS quantum dots (QDs). The methodology enabled the use of a simple synthesis procedure for water solubilization of CdS QDs a fast route using glutathione as a capping agent within 15 min. The resulting water-soluble QDs exhibit a strong fluorescence emission at 536 nm with high and reproducible photostability. PA is an important class of electron acceptors for QDs. Thus, the fluorescence intensity of the glutathione-capped CdS QDs probe could be dramatically quenched by PA due to the electron transfer mechanism. The fluorescence intensity of the CdS QDs system was proportional to PA concentration in the range of 0.025 to 1.5 μg mL−1, with a detection limit of 0.01 μg mL−1. The time of analysis sample, including preparation of QDs and fluorescent measurement for PA, was only 20 min. Most of the potentially coexisting substances did not interfere with the PA-induced quenching effect except diquat. Furthermore, the analytical applicability of the proposed method was demonstrated by analyzing PA in water, rice and cabbage samples, and the recoveries were between 86 and 105% which satisfied the requirement of detection for PA. These results showed that the proposed method was simple in design and fast in operation, and could be used as a sensitive tool for detecting PA in environmental and agricultural samples.

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