Use este identificador para citar ou linkar para este item: http://www.repositorio.cdtn.br:8080/jspui/handle/123456789/505

Título do periódico:	Journal of Non-crystalline Solids Amsterdam
Autor(es):	Costa, Vilma Conceição Shen, Y.R. Bray, K.L.
Afiliação:	Centro de Desenvolvimento da Tecnologia Nuclear/CDTN, Belo Horizonte, Mg, Brasil Washington State University, Pullman, WA USA Washington State University, Pullman, WA, USA
Data do documento:	2002
Palavras-chave:	Semiconductor materials;optical properties;sol-gel process
Resumo:	In the present work,we report our results for the sol-gel preparation and optical properties of CdS nanometer sized particles and Mn2+-doped Us particles in silica-type glass matrices. Gels containing 4.5 wt percent CdO in 95.5SiO(2) and 4.5Na(2)O-18B(2)O(3)-73.5SiO(2) matrices were prepared through a hydrolysis of tetrraethoxysilane, cadmium acetate and, in the sodium borosilicate composition, boron ethhoxide and sodium acetate. We designed severeal heat treatments i H2S to convert CdO to Us in the gels. The influence of the heat treatment conditions on the optical properties of the nanoparticle semiconductor materials was studied using transmission electron microscopy, absorption and temperaure-dependent photoluminescence. A model of the photoluminescence process was proposed to explain the obvserved emission bands.
Acesso:	L
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