Nanoscale manipulation of CdSe quantum dots in layer-by-layer films: Influence of the host polyelectrolyte on the luminescent properties

V. Zucolotto, K. M. Gattás-Asfura, T. Tumolo, A. C. Perinotto, P. A. Antunes, C. J.L. Constantino, M. S. Baptista, R. M. Leblanc, O. N. Oliveira

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

Thioglycolic acid-capped CdSe quantum dots (QDs) were assembled on glass substrates with two distinct polyelectrolytes, viz poly(allylamine hydrochloride) (PAH) and poly(amidoamine) (PAMAM), generation 4 dendrimer, via the layer-by-layer (LbL) technique. Films containing up to 30 polyelectrolyte/QD bilayers were prepared. The growth of the multilayers was monitored with UV-vis spectroscopy, which showed an almost linear increase in the absorbance of the 2.8 nm QDs at 535 nm with the number of deposited bilayers. AFM measurements estimated a film thickness of 3 nm per bilayer for the PAH/CdSe films. The adsorption process and the optical properties of the PAMAM/CdSe LbL films were further analyzed layer-by-layer using surface plasmon resonance (SPR), from which a thickness of 3.2 nm was found for a PAMAM/CdSe bilayer. Photoluminescence measurements revealed higher photooxidation of the quantum dots in PAH/CdSe than in PAMAM/CdSe films.

Original languageEnglish (US)
Pages (from-to)397-402
Number of pages6
JournalApplied Surface Science
Volume246
Issue number4
DOIs
StatePublished - Jun 30 2005

Keywords

  • Layer-by-layer
  • Poly(allylamine hydrochloride)
  • Poly(amidoamine)
  • Quantum dots

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Condensed Matter Physics

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    Zucolotto, V., Gattás-Asfura, K. M., Tumolo, T., Perinotto, A. C., Antunes, P. A., Constantino, C. J. L., Baptista, M. S., Leblanc, R. M., & Oliveira, O. N. (2005). Nanoscale manipulation of CdSe quantum dots in layer-by-layer films: Influence of the host polyelectrolyte on the luminescent properties. Applied Surface Science, 246(4), 397-402. https://doi.org/10.1016/j.apsusc.2004.11.044