Photodegradation of SiO2-coated CdS nanoparticles within silica gels.
J Nanosci Nanotechnol
; 1(1): 95-9, 2001 Mar.
Article
en En
| MEDLINE
| ID: mdl-12914037
ABSTRACT
A comparative study of the photodegradation of CdS nanoparticles coated with silica shells dispersed in water and embedded in two silica gels with different pore size is presented. Although encapsulation of the quantum dots in a silica shell previously was proven to provide a basically permanent protection against light-induced surface oxidation (photodegradation), this protection is not always maintained when the coated particles are incorporated within different silica gels. Degradation of the CdS occurs when the coated particles are incorporated within silica gels with an open structure, which suggests that the shells somehow crack due to tension in the gel structure. This behavior is analyzed by absorption and luminescence spectroscopies, electron microscopy, and nitrogen sorption.
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Base de datos:
MEDLINE
Asunto principal:
Sulfuros
/
Dióxido de Silicio
/
Compuestos de Cadmio
/
Nanotecnología
Tipo de estudio:
Evaluation_studies
Idioma:
En
Revista:
J Nanosci Nanotechnol
Año:
2001
Tipo del documento:
Article
País de afiliación:
España