DOI: 10.1063/1.1797071. Water-soluble silica-overcoated CdS:Mn/ZnS semiconductor quantum dots

Water-soluble silica-overcoated CdS:Mn/ZnS semiconductor quantum dots

10.1063/1.1797071

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Highly luminescent and photostable CdS:Mn/ZnS core/shell quantum dots are not water soluble because of their hydrophobicity. To create water-soluble quantum dots by an appropriate surface functionalization, CdS:Mn/ZnS quantum dots synthesized in a water-in-oil (W/O) microemulsion system (reverse micelles) were consecutively overcoated with a very thin silica layer (∼2.5 nm thick) within the same reverse micellar system. The water droplet serves as a nanosized reactor for the controlled hydrolysis and condensation of a silica precursor, tetraethyl orthosilicate (TEOS), using an ammonium hydroxide (NH4OH) catalyst. Structural characterizations with transmission electron microscopy (TEM) and x-ray photoelectron spectroscopy (XPS) indicate that the silica-quantum dot nanocomposites consist of a layered structure. Owing to the amorphous, porous nature of a silica layer, the optical and photophysical properties of silica-overcoated CdS:Mn/ZnS quantum dots are found to remain close to those of uncoated counterparts.

Bibliography

Yang, H., Holloway, P. H., & Santra, S. (2004). Water-soluble silica-overcoated CdS:Mn/ZnS semiconductor quantum dots. The Journal of Chemical Physics, 121(15), 7421â7426.

Authors 3

Heesun Yang (first)
Paul H. Holloway (additional)
Swadeshmukul Santra (additional)

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Dates

Type	When
Created	20 years, 11 months ago (Oct. 5, 2004, 9:39 a.m.)
Deposited	1 year, 7 months ago (Feb. 6, 2024, 12:46 a.m.)
Indexed	1 year ago (Sept. 3, 2024, 3:22 p.m.)
Issued	20 years, 10 months ago (Oct. 15, 2004)
Published	20 years, 10 months ago (Oct. 15, 2004)
Published Print	20 years, 10 months ago (Oct. 15, 2004)

Funders 0

None

BibTeX

@article{Yang_2004, title={Water-soluble silica-overcoated CdS:Mn/ZnS semiconductor quantum dots}, volume={121}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.1797071}, DOI={10.1063/1.1797071}, number={15}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Yang, Heesun and Holloway, Paul H. and Santra, Swadeshmukul}, year={2004}, month=oct, pages={7421–7426} }

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