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Control growth of PbS quantum dots doped sono-ormosil

Published online by Cambridge University Press:  31 January 2011

R. Erce-Montilla ,
M. PiÑero ,
N.de la Rosa-Fox ,
A. Santos  and
L. Esquivias
R. Erce-Montilla
Affiliation:
Dpto. Física de la Materia Condensada, Universidad de Cádiz, Aptdo. 40, 11510 Puerto, Real (Cadiz), Spain
M. PiÑero
Affiliation:
Dpto. Física Aplicado, Univeridad de Cádiz, Aptdo. 40, 11510 Puerto, Real (Cadiz), Spain
N.de la Rosa-Fox
Affiliation:
Dpto. Cristalografía y Mineralogía, Estratigrafía, Geodinámica y Petrología y Geoquímica, Universidad de Cádiz, Aptdo. 40, 11510 Puerto, Real (Cadiz), Spain
A. Santos
Affiliation:
Dpto. Cristalografía y Mineralogía, Estratigrafía, Geodinámica y Petrología y Geoquímica, Universidad de Cádiz, Aptdo. 40, 11510 Puerto, Real (Cadiz), Spain
L. Esquivias
Affiliation:
Dpto. Física de la Materia Condensada, Universidad de Cá;diz, Aptdo. 40, 11510 Puerto, Real (Cadiz), Spain
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Abstract

Semiconductor PbS quantum dots doped-SiO2 organically modified silicate (ormosil) gels were synthesised via sol-gel by using high-power ultrasounds (sonogel). The effect of PbS crystal concentration and the addition of (3-mercaptopropyl)trimethoxysilane acting as surface capping agent (SCA) were investigated. By adjustment of the SCA to lead ratio, PbS nanoparticles of different sizes and morphologies were obtained. Textural parameters were calculated from N2 physisorption isotherms. The PbS galena phase was identified by x-ray diffraction, the crystal size by high-resolution transmission electron microscopy, and the exciton confinement by ultraviolet–visible–near-infrared spectrophotometry. Crystallite mean sizes of spheres and cubes ranging from 6.5 to 10.5 nm and needles 7-nm wide and 15–20 nm long, for different PbS and SCA concentrations, were obtained. These results differ from those predicted by the effective mass approximation corroborating the band gap modifications in the smallest nanocrystals. The method allows the control of the crystal size and improves the stabilization of the PbS nanocrystals.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 9 , September 2001 , pp. 2572 - 2578
Copyright
Copyright © Materials Research Society 2001

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