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CdSe Nanocrystals Formation in Silica Sonogels

Published online by Cambridge University Press:  21 February 2011

Daniele C. Hummel ,
Iris L. Torriani ,
Aline Y. Ramos ,
Aldo F. Craievich ,
Nicolas De La Rosa-Fox  and
Luis Esquivias
Daniele C. Hummel
Affiliation:
Dema-Fem, Unicamp, Campinas, S.P., Brazil
Iris L. Torriani
Affiliation:
Instituto de Física, Unicamp, Campinas, S.P., Brazil
Aline Y. Ramos
Affiliation:
Instituto de Física, Unicamp, Campinas, S.P., Brazil
Aldo F. Craievich
Affiliation:
Lnls, Campinas, S.P., Brazil
Nicolas De La Rosa-Fox
Affiliation:
Facultad de Ciencias, UCA, Aptdo 40, 11510 Puerto Real (Cádiz), SPAIN.
Luis Esquivias
Affiliation:
Facultad de Ciencias, UCA, Aptdo 40, 11510 Puerto Real (Cádiz), SPAIN.
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Abstract

Host-matrix gels were prepared by hydrolysis of TEOS with the addition of cadmium nitrate, formamide as DCCA (drying control chemical additive) and submitted to a preselected dose of high power ultrasound. The impregnation of the dry “sonogel” with KSeCN solution under vacuum conditions promoted the formation of the CdSe nanocrystals and enhanced the mechanical properties of the matrix. A transparent red xerogel was obtained and characterized by optical spectroscopy, TEM and SAXS measurements. The results support a structural model of a porous matrix containing CdSe nanocrystals exhibiting a bimodal size distribution that depends on the Se content of the impregnating solutions. The blue shift of the optical absorption bands reveal the quantum-size confinement effects of CdSe nanocrystals.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 673
Copyright
Copyright © Materials Research Society 1998

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References

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