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Synthesis, Characterization, and Optical Properties of Quantum Dots

Gerion, D, Pinaud, F, Williams, SC, Parak, WJ, Zanchet, D, Synthesis and properties of biocompatible water‐soluble silica‐coated CdSe/ZnS semiconductor quantum dots. J Phys Chem B 2001, 105(): 8861–8871.

Colloidal synthesis and characterization of cdse quantum dots ..

Selvan, ST, Patra, PK, Ang, CY, Ying, JY. Synthesis of silica‐coated semiconductor and magnetic quantum dots and their use in the imaging of live cells. Angew Chem Int Ed Engl 2007, 46(): 2448–2452.

(CdSe)ZnS core-shell quantum dots: Synthesis and ..

Synthesis of Water-Soluble Antimony Sulfide Quantum Dots and Their ..

A new and convenient route is developed to synthesize CdSe and core-shell CdSe/CdS quantum dots (QDs) in aqueous solution. The gaseous precursors, H2Se and H2S, generated on-line by reducing SeO32− with NaBH4 and the reaction between Na2S and diluted H2SO4, are used to form high-quality CdSe and CdSe/CdS QDs, respectively. The synthesized water-soluble CdSe and CdSe/CdS QDs possess high quantum yield (3% and 20%) and narrow full-width-at-half-maximum (43 nm and 38 nm). The synthesis process is easily reproducible with simple apparatus and low-toxic chemicals, and can be readily extended to the large-scale aqueous synthesis of QDs.

93. Su Y, He Y, Lu H, Sai L, Li Q, Li W. . The cytotoxicity of cadmium based, aqueous phase - Synthesized, quantum dots and its modulation by surface coating. 2009;30:19-25

3 quantum dots (QDs) because of the synthesis difficulties

Abstract:
The administration of nanoparticles to tumors followed by alternating magnetic field application was shown to efficiently destroy tumors both preclinically and clinically, especially glioma. However, antitumor efficacy remains suboptimal and requires further improvements. We therefore developed a new type of nanoparticles synthesized by magnetotactic bacteria called magnetosomes. Due to their chain arrangement that leads to uniform distribution, ferrimagnetic properties that enhance their heating power and to a controlled release of endotoxins that attract polynuclearneutrophiles, we show that chains of magnetosomes achieve full destruction of intracranial U87-Luc glioma tumors under AMF application in 40% of treated mice using a rather low quantity of magnetosomes administered of 13 µg of magnetosomes per mm3 of tumor. By contrast, under the same treatment conditions, signs of antitumor activity are not observed with chemically synthesized nanoparticles currently used in the magnetic hyperthermia treatment of tumors. It also appears that full glioma destruction is achieved when magnetosomes occupy only 10% of the whole tumor volume, which suggests the involvement of an indirect mechanism of tumor destruction, which is desired for the treatment of infiltrating tumors, such as glioma, for which whole tumor coverage by nanoparticles can hardly be achieved.

73. Gerion D, Pinaud F, Williams SC, Parak WJ, Zanchet D, Weiss S. . Synthesis and Properties of Biocompatible Water-Soluble Silica-Coated CdSe/ZnS Semiconductor Quantum Dots. 2001;105:8861-71

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Problems with CdSe(ZnS) quantum dots ..

54. Dabbousi BO, Rodriguez-Viejo J, Mikulec FV, Heine JR, Mattoussi H, Ober R. . (CdSe)ZnS Core-Shell Quantum Dots: Synthesis and Characterization of a Size Series of Highly Luminescent Nanocrystallites. 1997;101:9463-75

Synthesis of CdSe Quantum Dot Nanoparticles - VidInfo

46. Dorfs D, Krahne R, Falqui A, Manna L, Giannini C, Zanchet D. Quantum Dots: Synthesis and Characterization. In: (ed.) David LA, Gregory DS, Gary PW. Amsterdam: Academic Press. 2011:219-70

Synthesis of CdSe Quantum Dot ..

Wu et al. reported polysaccharide-based hybrid nanogels that combine functional building blocks for optical pH-sensing, cancer cell imaging, and controlled drug release within a single nanoparticle system for combined diagnosis and therapy.[] The hybrid nanogels were synthesized by in-situ immobilization of CdSe QDs in the interior of the dual responsive (pH and temperature) hydroxypropylcellulose -poly (acrylic acid) (HPC-PAA) semi-interpenetrating polymer networks. The HPC-PAA-CdSe hybrid nanogels combine a strong trap emission at 741 nm for sensing physicochemical environment in a pH dependent manner and a visible excitonic emission at 592 nm for mouse melanoma B16F10 cell imaging. The hybrid nanogels also provide excellent stability as a drug carrier. They not only provide a high drug loading capacity for a model anticancer drug, temozolomide, but also offer a pH-triggered sustained-release of the drug molecules in the gel network.

application of CdSe quantum dots ..

For their in vitro cell labeling studies, the cultured human embryonal kidney cell line 293T cells were incubated with the PAA-capped CdSe/CdS core–shell QDs (λem max = 559 nm, about 3 nm in size) with the concentration of 5 μg/mL for 4 h at 37°C. After 4 h, the cells were washed thrice with PBS to remove extra nanoparticles that were not uptaken by the cells and imaged using a laser scanning confocal microscope. Figure shows the typical labeling images of 293T cells with PAA-capped CdSe/CdS core–shell QDs. From these images, the bright green optical signal can be clearly observed from the cell interior. The result demonstrated that the as-synthesized quantum dots can be quickly uptaken by the 293T cells within 4 h. Moreover, we did not observe any signs of morphological damage to the cells after the treatment with PAA-capped CdSe/CdS core–shell QDs. This preliminary result indicates that the as-prepared QDs had promising applications as fluorescent biological labels.

Stable water-soluble CdSe/ZnS quantum dots with …

For their in vitro cell labeling studies, the cultured human embryonal kidney cell line 293T cells were incubated with the PAA-capped CdSe/CdS core–shell QDs (λem max = 559 nm, about 3 nm in size) with the concentration of 5 μg/mL for 4 h at 37°C. After 4 h, the cells were washed thrice with PBS to remove extra nanoparticles that were not uptaken by the cells and imaged using a laser scanning confocal microscope. Figure shows the typical labeling images of 293T cells with PAA-capped CdSe/CdS core–shell QDs. From these images, the bright green optical signal can be clearly observed from the cell interior. The result demonstrated that the as-synthesized quantum dots can be quickly uptaken by the 293T cells within 4 h. Moreover, we did not observe any signs of morphological damage to the cells after the treatment with PAA-capped CdSe/CdS core–shell QDs. This preliminary result indicates that the as-prepared QDs had promising applications as fluorescent biological labels.

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