Localized formation and size tuning of CdS nanocrystals upon irradiation of metal precursors embedded in polymer matrices

Despina Fragouli, Anna Maria Laera, Pier Paolo Pompa, Gianvito Caputo, Vincenzo Resta, Marco Allione, Leander Tapfer, Roberto Cingolani, Athanassia Athanassiou

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Abstract

We present a method of spatial and dimensional controlled formation of CdS quantum dots into polymer matrices by light irradiation. The initial samples consist of Cd thiolate precursors doped in TOPAS polymer matrix. Under pulsed UV laser irradiation the precursors are photolysed driving to the nucleation of CdS nanocrystals, with increasing size and concentration, related to the number of UV pulses. The formed quantum dots are localized in the irradiated area, while the host polymer remains macroscopically unaffected by the UV irradiation. In this study we investigate how the formation of the nanocrystals (size, dimensions, and concentration) is affected by the use of different irradiation conditions (wavelength, number of pulses), revealing information about the different pathways followed during the formation. The change of the size of the dots results in the change of the peak of their emission due to the quantum size effect, which is studied by fluorescence measurements. The results are reinforced by TEM microscopy and by XRD measurements. The main advantages of the presented method are the size tuning of the produced dots and their spatial confinement inside the host matrix, not possible by the other methods used until now (thermal annealing, mixing etc.). © 2008 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)816 - 819
Number of pages4
JournalMicroelectronic Engineering
Volume86
Issue number4-6
DOIs
Publication statusPublished - Apr 2009
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering

Cite this

Fragouli, D., Laera, A. M., Pompa, P. P., Caputo, G., Resta, V., Allione, M., ... Athanassiou, A. (2009). Localized formation and size tuning of CdS nanocrystals upon irradiation of metal precursors embedded in polymer matrices. Microelectronic Engineering, 86(4-6), 816 - 819. https://doi.org/10.1016/j.mee.2008.12.050