Title :

Effects of the sol-gel solution host on the chemical and optical properties of PbS quantum dots

Author(s) :

Capoen, Bruno [Auteur correspondant]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Martucci, A. [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Turrell, S. [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Bouazaoui, M. [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]

Journal title :

Journal of Molecular Structure

Pages :

467-473

Publisher :

Elsevier

Publication date :

2003

ISSN :

0022-2860

English abstract : [en]

PbS nanoparticles were prepared via a colloidal route using an organic capping agent, and were incorporated in both a silica and a titania sol-gel solution with a concentration of 10 mol%. The stability of the particles ...
Show more >PbS nanoparticles were prepared via a colloidal route using an organic capping agent, and were incorporated in both a silica and a titania sol-gel solution with a concentration of 10 mol%. The stability of the particles embedded in the sols was lengthened from 2 h to several days and their growth was considerably slowed down. The kinetics of the optical absorption allowed us to quantify the growth rate of the particles. Analysis of the optical emission in the three solutions (colloid, SiO2/PbS and TiO2/PbS) showed that the PbS nanocrystals are partially passivated by the silica chains and completely by the titania chains in the sols. Conjoint study of the optical absorption and emission measurements revealed a correlation between the presence of a structured exciton peak in the absorption spectra and the absence of shallow surface states.Show less >

Language :

Anglais

Popular science :

Non

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL