CdS nanoparticles and the sol-gel process

Thierry Gacoin; Laurent Malier; G. Counio; Jean-Pierre Boilot

doi:10.1117/12.284132

2 October 1997 CdS nanoparticles and the sol-gel process

Thierry Gacoin, Laurent Malier, G. Counio, Jean-Pierre Boilot

Proceedings Volume 3136, Sol-Gel Optics IV; (1997) https://doi.org/10.1117/12.284132
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

We present two approaches for the sol-gel synthesis of transparent solids in which CdS nanoparticles are homogeneously dispersed. In any case CdS nanocrystals are obtained by precipitation either in reverse micelles or in the presence of a complexing thiol. The grafting of the 4- fluorothiophenol at the surface of the particles leads to highly concentrated colloids in acetone. In a first approach, CdS/silica nanocomposites are prepared introducing this concentrated CdS colloid in a silica sol which contains 3- mercaptopropyltrimethoxysilane to ensure the homogeneity of the CdS dispersion. The luminescence properties of the materials are improved by using methyltriethoxysilane instead of tetraethoxysilane as the alkoxide precursor of the silica matrix. Further increase of the luminescence efficiency is also observed if a single Mn2+ ion is present inside the CdS particle. In a second approach, pure CdS nanocrystalline materials (bulk or thin films) are obtained from the sol-gel processing of the concentrated colloids stabilized by 4- fluorothiophenol. The mechanisms driving the aggregation of the particles and the gelation of the system are explicited. Thin films as well as monoliths can be produced. The general principles of this method are not restricted to chalcogenide materials, and should therefore enlarge the applications of the sol-gel proces to other non-oxide materials.

Citation Download Citation

Thierry Gacoin, Laurent Malier, G. Counio, and Jean-Pierre Boilot "CdS nanoparticles and the sol-gel process", Proc. SPIE 3136, Sol-Gel Optics IV, (2 October 1997); https://doi.org/10.1117/12.284132

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