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PbS-doped mesostructured silica films with high optical nonlinearity

Buso, Dario and Falcaro, Paolo and Costacurta, Stefano and Guglielmi, Massimo and Martucci, Alessandro and Innocenzi, Plinio and Malfatti, Luca and Bello, Valentina and Mattei, Giovanni and Sada, Cinzia and Amenitsch, Heinz and Gerdova, Irina and Haché, Alan (2005) PbS-doped mesostructured silica films with high optical nonlinearity. Chemistry of materials, Vol. 17 (20), p. 4965-4970. eISSN 1520-5002. Article.

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DOI: 10.1021/cm050850j

Abstract

Mesostructured silica films have been doped with lead sulfide (PbS) nanocrystals by a two-step impregnation, using the mesopores as nanoreactors for PbS growth. Secondary ion mass spectrometry and transmission electron microscopy characterizations demonstrated nanocrystals growth inside the pores and throughout the film thickness, pointing out the feasibility of an impregnation-based synthesis made possible by the porous properties of mesoporous silica films. The mean particles diameter is 5 nm, which is compatible with the pore dimensions. The mesostructure order was retained after the growth of the nanocrystals, as pointed out by small-angle X-ray scattering measurements. Optical absorption and Z-scan measurements indicated that PbS nanoparticles show a quantum confinement effect, while the films are characterized by high nonlinearities of the optical response. The optical properties of this material can be usefully exploited in several nonlinear optical applications.

Item Type:Article
ID Code:1272
Status:Published
Refereed:Yes
Uncontrolled Keywords:Mesostructured silica films, PbS nanoparticles, optical applications
Subjects:Area 09 - Ingegneria industriale e dell'informazione > ING-IND/22 Scienza e tecnologia dei materiali
Divisions:001 Università di Sassari > 01 Dipartimenti > Architettura e pianificazione
Publisher:American Chemical Society
eISSN:1520-5002
Deposited On:18 Aug 2009 10:04

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