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Rozprawy doktorskie na temat "Coque d'or"
Bogicevic, Alexandra. "Synthèse colloïdale de structures hybrides or/quantum dots". Electronic Thesis or Diss., Université Paris sciences et lettres, 2021. http://www.theses.fr/2021UPSLS092.
Pełny tekst źródłaColloidal semiconductor nanocrystals, also known as quantum dots (QDs), have exceptional optical properties, such as high absorption cross section and quantum yield. Their emission spectra can be tuned by changing their size, their shape or composition. Recently, our group reported the plasmonic coupling of unique QD emitters embedded in silica coated with a gold nanoshell with a Purcell factor of 6. The resulting emitters showed enhanced photostability and reduced blinking rates.In this thesis, we explore synthesis and optical properties of similar objects containing not one but hundreds of QDs in their core (superparticles).We first synthesize CdSe/CdS/ZnS core/multishell QDs and assemble them into aggregates of controlled sizes by emulsion/evaporation. The aggregates are then coated with a silica shell (Stöber process) and with a gold nanoshell using a deposition process.The optical properties of QD aggregates with and without gold shells are addressed. These objects exhibit high quantum efficiency, as well as stable and Poissonian emission at room temperature. In addition, we demonstrate a Förster-type resonance energy transfer (FRET) between neighboring QDs inside the aggregates. We also prove that polyvinylpyrrolidone (PVP) can be used to regulate both the reduction rate of gold and the morphology of the gold nanoshell.The second objective is to transpose this synthesis onto 2D semiconductor nanocrystals called nanoplatelets (NPLs) which exhibit particular emission polarization properties thanks to their anisotropic shape. To preserve this anisotropy throughout the synthesis process of the gold nanoshells, a supplementary extension step has to be conducted on these NPLs
Ji, Botao. "Synthesis and optical properties of plasmonic fluorescent quantum dots". Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066674/document.
Pełny tekst źródłaDue to the surface plasmons in metallic nanostructures and the exceptional optical and electrical properties of colloidal semiconductor quantum dots (QDs), QD/metal hybrid nanostructures attract much attention. However, although these structures are very promising, colloidal single QD/gold hybrids have rarely been synthesized.We managed to develop for the first time a generalized synthetic route to synthesize a QD/SiO2/Au core/shell/shell hybrid structure (golden QDs). First, hydrophobic QDs are individually encapsulated in silica beads via reverse microemulsion. The obtained QD/SiO2 nanoparticles are then coated with a continuous gold nanoshell using a solution deposition process. The thicknesses of the silica and the gold layers can be tailored independently to various dimensions. We showed that single golden thick-shell CdSe/CdS QDs provide a system with a stable and poissonian emission at room temperature and a high photostability. This novel hybrid golden QD structure behaves as a plasmonic resonator with a strong (~ 6) Purcell factor, in very good agreement with simulations. We also present the self-assembly of hydrophobic QDs into colloidal superparticles (SPs). With a fine choice of QDs, SPs could indeed possess outstanding properties including non-blinking fluorescence, high fluorescence intensity and multi-color emission. Multi-functional SPs could also be obtained by mixing fluorescent or magnetic nanocrystals. The subsequent growth of a silica shell on the SPs allowed an enhancement of their stability and we demonstrated this silica shell could itself be covered by a gold nanoshell to further improve the SPs photostability and biocompatibility
Ji, Botao. "Synthesis and optical properties of plasmonic fluorescent quantum dots". Electronic Thesis or Diss., Paris 6, 2014. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2014PA066674.pdf.
Pełny tekst źródłaDue to the surface plasmons in metallic nanostructures and the exceptional optical and electrical properties of colloidal semiconductor quantum dots (QDs), QD/metal hybrid nanostructures attract much attention. However, although these structures are very promising, colloidal single QD/gold hybrids have rarely been synthesized.We managed to develop for the first time a generalized synthetic route to synthesize a QD/SiO2/Au core/shell/shell hybrid structure (golden QDs). First, hydrophobic QDs are individually encapsulated in silica beads via reverse microemulsion. The obtained QD/SiO2 nanoparticles are then coated with a continuous gold nanoshell using a solution deposition process. The thicknesses of the silica and the gold layers can be tailored independently to various dimensions. We showed that single golden thick-shell CdSe/CdS QDs provide a system with a stable and poissonian emission at room temperature and a high photostability. This novel hybrid golden QD structure behaves as a plasmonic resonator with a strong (~ 6) Purcell factor, in very good agreement with simulations. We also present the self-assembly of hydrophobic QDs into colloidal superparticles (SPs). With a fine choice of QDs, SPs could indeed possess outstanding properties including non-blinking fluorescence, high fluorescence intensity and multi-color emission. Multi-functional SPs could also be obtained by mixing fluorescent or magnetic nanocrystals. The subsequent growth of a silica shell on the SPs allowed an enhancement of their stability and we demonstrated this silica shell could itself be covered by a gold nanoshell to further improve the SPs photostability and biocompatibility
Ji, Botao. "Synthèse et propriétés optiques de quantum dots fluorescents plasmoniques". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2014. http://pastel.archives-ouvertes.fr/pastel-01065068.
Pełny tekst źródłaKsiążki na temat "Coque d'or"
Rougeron, Philippe. La conque d'or pour Cor en Fa avec accompagnement de Piano. Paris: Combre, 1990.
Znajdź pełny tekst źródłaHachette i DISNEY (STUDIO). Walt Disney présente - Ariel et la conque d'or. Hachette, 1995.
Znajdź pełny tekst źródłaHachette i DISNEY (STUDIO). Walt Disney présente - Ariel et la conque d'or. Hachette, 1995.
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