TY - JOUR
T1 - Nanoscale manipulation of CdSe quantum dots in layer-by-layer films
T2 - Influence of the host polyelectrolyte on the luminescent properties
AU - Zucolotto, V.
AU - Gattás-Asfura, K. M.
AU - Tumolo, T.
AU - Perinotto, A. C.
AU - Antunes, P. A.
AU - Constantino, C. J.L.
AU - Baptista, M. S.
AU - Leblanc, R. M.
AU - Oliveira, O. N.
N1 - Funding Information:
Financial assistance from FAPESP, CNPq (Brazil) and NSF (USA) is acknowledged.
PY - 2005/6/30
Y1 - 2005/6/30
N2 - 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.
AB - 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.
KW - Layer-by-layer
KW - Poly(allylamine hydrochloride)
KW - Poly(amidoamine)
KW - Quantum dots
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U2 - 10.1016/j.apsusc.2004.11.044
DO - 10.1016/j.apsusc.2004.11.044
M3 - Article
AN - SCOPUS:19744370056
VL - 246
SP - 397
EP - 402
JO - Applied Surface Science
JF - Applied Surface Science
SN - 0169-4332
IS - 4
ER -