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Salt-Induced Block Copolymer Micelles as Nanoreactors for the Formation of CdS Nanoparticles

Published online by Cambridge University Press:  15 March 2011

Hanying Zhao  and
Elliot P. Douglas
Hanying Zhao
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611, USA
Elliot P. Douglas
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611, USA
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Abstract

A novel preparation method of CdS nanoparticles in the core or corona of micelles is presented. Poly(styrene-block-2-vinylpyridine) (PS-b-P2VP) and cadmium ions form aggregates of single micelles, called compound micelles, upon addition of the cadmium acetate salt into a solution of the block copolymer in tetrahydrofuran. The growth of CdS nanoparticles is confined to the core of single micelles after introduction of hydrogen sulfide gas into the solution. UV-visible spectroscopy, fluorescence spectroscopy, and transmission electron microscopy were employed to characterize the prepared core-embedded CdS nanoparticles. Corona-embedded CdS nanoparticles were prepared by dropping the core-embedded CdS nanoparticles into water with a low pH value. The location change of the CdS nanoparticles was accompanied by a structural change of the micelles, a change from compound micelles to single micelles. In a single micelle, CdS nanoparticles distribute randomly in the corona. The size of the nanoparticles increases slightly after the transition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 703: Symposia U/V – Nanophase and Nanocomposite Materials IV , 2001 , V2.3
Copyright
Copyright © Materials Research Society 2002

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References

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