The effect of irradiation wavelength on the quality of CdS nanocrystals formed directly into PMMA matrix

Despina Fragouli, Pier P. Pompa, Maria Kalyva, Gianvito Caputo, Leander Tapfer, Roberto Cingolani, Athanassia Athanassiou

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Abstract

UV laser irradiation of PMMA films containing Cd thiolate precursors results in the spatially selective formation of CdS crystalline nanoparticles in the host matrix. Here we investigate the effect of the irradiation wavelength on the quality of the formed nanocrystals. Fluorescence topography and XPS studies reveal that the polymer matrix contributes to the trap states formation on the surface of the nanocrystals. When the latter are formed upon irradiation at 266 nm, they exhibit broad emission spectra, ascribed to the high degree of photodegradation of the polymer. In contrast, the irradiation at 355 nm does not chemically modify the matrix, resulting in the formation of CdS nanocrystals with narrow emission, i.e. high emission quality. This is further confirmed by fluorescence lifetime topography studies giving a mean fluorescence nanocrystal lifetime as short as 200 ps at room temperature. Thus, the optimized combination of irradiation wavelength with polymer matrix gives nanocomposite materials incorporating nanocrystals of high quality, ready to be used in various optical applications. © 2010 American Chemical Society.
Original languageEnglish
Pages (from-to)13985 - 13990
Number of pages6
JournalJournal of Physical Chemistry C
Volume114
Issue number33
DOIs
Publication statusPublished - 26 Aug 2010
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Fragouli, D., Pompa, P. P., Kalyva, M., Caputo, G., Tapfer, L., Cingolani, R., & Athanassiou, A. (2010). The effect of irradiation wavelength on the quality of CdS nanocrystals formed directly into PMMA matrix. Journal of Physical Chemistry C, 114(33), 13985 - 13990. https://doi.org/10.1021/jp103387a