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Semiconductor nanoparticles with organic and biological molecules that can be used for biomarker interface effect

Author: AnLiMin
Tutor: LiuYiChun;KongXiangGui
School: Northeast Normal University
Course: Biophysical
Keywords: Nanoparticles Quantum dots Fluorescence CdSe
CLC: TB383
Type: Master's thesis
Year: 2004
Downloads: 257
Quote: 5
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Abstract


Semiconductor nanocrystals (NCs) whose radii are smallerthan the bulk exciton Bohr radius constitute a class of materialsintermediate between molecular and bulk forms of matter.Quantumconfinement of both electron and hole in all three dimensions(so called quantum dots) leads to an increase in the effectiveband gap of the material with decreasing NCs size. Consequently,Cadmium chalcogenide NCs exhibit an efficient photoluminescence(PL), whose energy or color can be controlled easily by adjustingtheir sizes. Because the surface of a nanocrystal is made up ofatoms that are not fully coordinated, it is highly active andinvites the possibility of epitaxial overgrowth of anothersemiconductor material. In addition, surface atoms act likedefects unless passivated.To remove these defects, high qualityhomogeneous and monodisperse NCs have been passivated withinorganic epitaxial growth. This can not only eliminate both theanionic and cationic surface dangling bonds but also generatea new nanocrystal system with novel properties. These core/shellsystems such as CdSe/CdS, CdSe/ZnS, CdSe/ZnSe, have shown highluminescence quantum yields, short fluorescence lifetimes, andother benefits related to the tailoring of relative band gapposition between the two materials. In this article an improved organometallic method andaqueous synthesis, the structures, and optical properties ofhighly luminescent and stable CdSe/ZnSe, CdSe/ZnO, CdSe/CdS NCs,which can be used for biological labels, are reported. UV-Vis 3<WP=6>absorption spectroscopy, photoluminescence spectroscopy,transmission electron microscopy, powder X-ray diffraction,X-ray photoelectron spectra, time-resolved fluorescenceSpectroscopy etc. were employed to study the size, shape,crystalloid structure, fluorescence character, light stability,surface constitutes. The coupling of this quantum dots with biomolecule-BSA wassuccessfully proved in this paper. We also find that the pH ofPBS can influence the coupling effect of CdSe quantum dots andBSA. We use the method of electrophoresis and immune test paper,we also can conclude that the CdSe quantum dots can couple withbiomolecule-BSA through electrostatic adsorption. The Poly (9-vinylcarbazole) (PVK)/SiO2 nano particlescomposite film on Si substrates were synthesized to study thefluorescence and interface effects with UV-Vis absorptionspectroscopy, photoluminescence spectroscopy and ramanspectroscopy. In a conclusion, highly luminescent and stable CdSe and SiO2nanoparticles were prepared successfully. The interface effectsof biomolecule and organic molecules with nanopartiles werediscussed. The results can be useful for the bioapplication ofnanoparticles. 4

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