Nanostructured semiconductor particles are currently under intense investigation because of their interesting photophysical and photochemical properties. Several preparation methods have been exploited for this class of materials; among them, the use of reverse micelles or "water-in-oil" microemulsions is a simple and successful preparative route. In this paper, a novel synthetic medium has been exploited, consisting of a quaternary CTAB/n-pentanol/n-hexane/water microemulsion. The presence of cosurfactant (n-pentanol), in addition to water, allows the simultaneous modulation of the water droplets dimensions and their exchange dynamics. Nanoparticles were characterized by UV-vis and photoluminescence spectroscopy, High-Resolution Transmission Electron Microscopy, and Raman spectroscopy. All measurements showed that the mean size of the nanoparticles is governed by the pentanol content of the system. They also possess a narrow size distribution and a good degree of crystallinity. Moreover, pentanol has an influence on the stability of CdS clusters, behaving as a capping agent at high concentrations. Stopped-flow measurements elucidated the influence of the cosurfactant in the kinetics of nucleation and growth.

Synthesis and characterization of CdS nanoclusters in a quarternary microemulsion: The role of the cosurfactant

Catalano M;
2000

Abstract

Nanostructured semiconductor particles are currently under intense investigation because of their interesting photophysical and photochemical properties. Several preparation methods have been exploited for this class of materials; among them, the use of reverse micelles or "water-in-oil" microemulsions is a simple and successful preparative route. In this paper, a novel synthetic medium has been exploited, consisting of a quaternary CTAB/n-pentanol/n-hexane/water microemulsion. The presence of cosurfactant (n-pentanol), in addition to water, allows the simultaneous modulation of the water droplets dimensions and their exchange dynamics. Nanoparticles were characterized by UV-vis and photoluminescence spectroscopy, High-Resolution Transmission Electron Microscopy, and Raman spectroscopy. All measurements showed that the mean size of the nanoparticles is governed by the pentanol content of the system. They also possess a narrow size distribution and a good degree of crystallinity. Moreover, pentanol has an influence on the stability of CdS clusters, behaving as a capping agent at high concentrations. Stopped-flow measurements elucidated the influence of the cosurfactant in the kinetics of nucleation and growth.
2000
PHOTOSENSITIZED CHARGE SEPARATION; REVERSE MICELLES; CADMIUM-SULFIDE; SEMICONDUCTOR CLUSTERS; NANOSIZED PARTICLES; ULTRAFINE PARTICLES; OIL MICROEMULSIONS; AQUEOUS-SOLUTION; SOLID-SOLUTION; RAMAN-SPECTRA
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/248563
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