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 Layer-by-layer deposition of organically capped quantum dots
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/6637

title: Layer-by-layer deposition of organically capped quantum dots
authors: Neves, M.C.
Pereira, A.S.
Peres, M.
Kholkin, A.
Monteiro, T.
Trindade, T.
keywords: Layer-by-layer methods
Nanostructures
Quantum dots
Semiconductors
issue date: 2006
publisher: MSF
abstract: Cadmium chalcogenide quantum dots (QD's) were synthesised using a single source approach while zinc oxide QD's were obtained by a colloidal technique. In both situations the dots were surface capped with tri-octylphosphine oxide (TOPO) hence leading to nanodispersed systems in organic solvents such as toluene. The organically capped QD's (CdSe, CdS and ZnO) were used as building-units to fabricate LbL (layer-by-layer) films on glass and quartz substrates. A linear increase in the visible light absorbance (due to the QD's) with the number of deposited layers indicates that multi-layered systems have been fabricated. In order to investigate the effect of the LbL manipulation on the integrity of the QD's, comparative studies on the optical properties of the starting QD's and the nanostructured films have been performed. The observation of quantum size effects in both cases suggests minimal degradation of the QD's though clustering had probably occurred, a point which was further confirmed by AFM analysis.
URI: http://hdl.handle.net/10773/6637
ISSN: 0255-5476
publisher version/DOI: dx.doi.org/10.4028/www.scientific.net/MSF.514-516.1111
source: Materials Science Forum
appears in collectionsFIS - Artigos

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