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• W1989524110 abstract "Amphiphilic diblock copolymers with the same hydrophilic but different hydrophobic blocks were used as stabilizing agents to prepare cadmium sulfide nanoparticles in aqueous solutions containing 5% of different nonaqueous solvents: methanol, THF, and acetone. Nearly spherical nanoparticles with a fair degree of monodispersity and quantum yields of 1.5%–2% were obtained. Optical absorption band edge of the CdS nanoparticles shows a &gt;0.5eV blueshift compared to that of bulk CdS, indicating a high degree of quantum confinement. The absorption spectra, while insensitive to the nature of the hydrophobic blocks, exhibited a clear dependence on the nature of the minor, nonaqueous solvents. The photoluminescence in all cases was broad and redshifted, indicating a predominance of surface trap-state emission. Time-resolved photoluminescence demonstrates that the trap states are populated within the first 500fs, followed by decay with a broad range of time constants from 0.1to&gt;10ns, low energy traps decaying at a slower rate than high-energy ones. Time-resolved photoluminescence anisotropy revealed that the nanoparticles experience a local microviscosity very similar to that of bulk water. The experimental observations suggest that nanoparticle formation takes place predominantly in the hydrophilic corona region of the micelles, around specific points with high local concentration of the Cd+2-coordinating basic amine groups of hydrophilic block and/or the minor, nonaqueous solvent component." @default.
• W1989524110 created "2016-06-24" @default.
• W1989524110 creator A5028058344 @default.
• W1989524110 creator A5070970004 @default.
• W1989524110 date "2007-04-04" @default.
• W1989524110 modified "2023-09-30" @default.
• W1989524110 title "Synthesis and spectroscopy of CdS nanoparticles in amphiphilic diblock copolymer micelles" @default.
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• W1989524110 doi "https://doi.org/10.1063/1.2714553" @default.
• W1989524110 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17430047" @default.
• W1989524110 hasPublicationYear "2007" @default.
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