Authors: Lü, Wei; Kamiya, Itaru

Source: Journal of Nanoscience and Nanotechnology, Volume 12, Number 1, January 2012 , pp. 410-415(6)

Publisher: American Scientific Publishers

Abstract:

We synthesized organic solvent-soluble and water-soluble PbS quantum dots (QDs) with different sizes. The organic solvent-soluble PbS QDs dispersed in tetrachloroethylene were used to prepare bilayers structures of QDs bound by dithiol linkers on GaAs. The water-soluble PbS QDs were used to prepare bilayer structures of QDs on quartz based on alternating adsorption of polyelectrolyte. For bilayer films on GaAs, it was found that the stacking sequence of QDs affects the quantum yield and emission wavelength of the larger QDs. However, for bilayer films with different stacking sequences on quartz, the larger QDs show similar PL intensities and emission wavelength independent of the sequence. The probable mechanism for this difference observed is discussed in terms of charge transfer between QDs.

Keywords: PBS QUANTUM DOTS; PHOTOLUMINESCENCE; LAYER-BY-LAYER ASSEMBLY; 1,6-HEXANEDITHIOL; POLY[DIALLYLDIMETHYLAMMONIUM CHLORIDE] (PDDA)

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2012.5361

Publication date: 2012-01-01

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