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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 ofcadmium nitrate, formamide as DCCA (drying control chemical additive) andsubmitted to a preselected dose of high power ultrasound. The impregnationof the dry “sonogel” with KSeCN solution under vacuum conditions promotedthe formation of the CdSe nanocrystals and enhanced the mechanicalproperties of the matrix. A transparent red xerogel was obtained andcharacterized by optical spectroscopy, TEM and SAXS measurements. Theresults support a structural model of a porous matrix containing CdSenanocrystals exhibiting a bimodal size distribution that depends on the Secontent of the impregnating solutions. The blue shift of the opticalabsorption bands reveal the quantum-size confinement effects of CdSenanocrystals.

Information

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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