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Porous Silicon Used as an Initiator in Polymerization Reactions

Published online by Cambridge University Press:  28 February 2011

Julie L. Heinrich ,
Alice Lee  and
Michael J. Sailor
Julie L. Heinrich
Affiliation:
University of California at San Diego, Department of Chemistry, 9500 Gilman Dr, La Jolla, CA 92093-0358
Alice Lee
Affiliation:
University of California at San Diego, Department of Chemistry, 9500 Gilman Dr, La Jolla, CA 92093-0358
Michael J. Sailor
Affiliation:
University of California at San Diego, Department of Chemistry, 9500 Gilman Dr, La Jolla, CA 92093-0358
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Abstract

Porous silicon is investigated as an initiator for radical polymerization reactions. Surface radicals and photogenerated e−/h+ pairs in porous silicon can be used to initiate polymerization reactions. Porous silicon wafers were placed in ethanolic solutions of methyl methacrylate, N-vinylcarbazole, acrylonitrile, or styrene and either left in the dark or excited by light. Methyl methacrylate polymerized in the absence of light, presumably via silicon-based radical initiator sites at the porous silicon surface. The N-vinylcarbazole polymerized to a small extent in the dark, and to a much greater extent during white light irradiation of the porous silicon surface. Photopolymerization is thought to occur via excited state hole transfer from the porous silicon to the N-vinylcarbazole monomer. Very little to no polymerization of acrylonitrile or styrene could be detected either in the dark or under illumination.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 358: Symposium F – Microcrystalline and Nanocrystalline Semiconductors , 1994 , 605
Copyright
Copyright © Materials Research Society 1995

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References

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