Physico-chemical role of CdSe/ZnS quantum dots in the photo-polymerization process of acrylate composite materials

Physical Chemistry Chemical Physics : PCCP
Anne BarichardYaël Israëli

Abstract

The work presented in this paper is devoted to the physico-chemical role of quantum dots (QDs) in the photopolymerization of composite materials. We show first that the photoexcitation of CdSe/ZnS semiconductor quantum dots can initiate the polymerization of an acrylate monomer in association with a tertiary amine and in the absence of a photoinitiator. But by using a holographic technique, among the others, the gratings recorded in such composite materials are not stable and relax once the light interference pattern is switched off. This behaviour is attributed to a very low degree of conversion of monomers, which does not prevent the post-exposure diffusion of monomers and nanoparticles. The comparison with gratings obtained in the presence of a photosensitizer dye (higher hologram quality and stability) highlights the key importance of using such dye in the polymerization process. The gratings recorded in the complete syrup, containing the dye and QDs which differ by their size and UV-visible absorption spectra, exhibit an additional refractive index modulation. The latter results from the spatial distribution of QDs and the change in the kinetics of polymerization. We further focus on understanding the fall of the polymeriz...Continue Reading

References

May 31, 2007·Small·Ana C C EstevesAna Barros-Timmons
Oct 12, 2007·Analytical Chemistry·Shyam V VaidyaAlexander Couzis
Jun 6, 2008·Journal of the American Chemical Society·Nicholas C StrandwitzGalen D Stucky
Feb 28, 2009·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Raquel E Galian, Juan C Scaiano
Jan 10, 2005·Optics Express·Lin PangYeshaiahu Fainman
Nov 3, 2010·The Journal of Physical Chemistry. B·Anne BarichardYaël Israëli

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