Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9567066 | Applied Surface Science | 2005 | 6 Pages |
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 30Â 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 2.8Â nm QDs at 535Â nm with the number of deposited bilayers. AFM measurements estimated a film thickness of 3Â 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 3.2Â 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.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
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. Jr.,