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Amorphous Nanowires and Crystalline Thin Films of SiO2-Li2O Compounds obtained by Combustion Chemical Vapor Deposition

Published online by Cambridge University Press:  01 February 2011

M. D. Lima ,
S.S. Stein ,
M.J. de Andrade  and
C.P. Bergmann
M. D. Lima
Affiliation:
Federal University of Rio Grande do Sul, DEMAT, Av. Osvaldo aranha, 99/705, Bairro Centro, Porto Alegre 900135–190, Brazil
S.S. Stein
Affiliation:
Federal University of Rio Grande do Sul, DEMAT, Av. Osvaldo aranha, 99/705, Bairro Centro, Porto Alegre 900135–190, Brazil
M.J. de Andrade
Affiliation:
Federal University of Rio Grande do Sul, DEMAT, Av. Osvaldo aranha, 99/705, Bairro Centro, Porto Alegre 900135–190, Brazil
C.P. Bergmann
Affiliation:
Federal University of Rio Grande do Sul, DEMAT, Av. Osvaldo aranha, 99/705, Bairro Centro, Porto Alegre 900135–190, Brazil
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Abstract

Amorphous silica films deposited by Combustion Chemical Vapor Deposition (CCVD) were modified by lithium addition in the precursor solution. The modified films were characterized by X-ray diffraction and scanning and transmission electron microscopy. The addition of lithium promoted the crystallization of Li2O-SiO2 compounds, mainly crystalline phases like Li2SiO3, Li2Si2O5, quartz and cristobalite. Besides that, the morphology of the film was modified, leading to the formation of acicular structures and nanowires. The acicular structures were identified through TEM associated with SAED as crystalline phases, mainly constituted by Li2SiO3 and Li2SiO5. TEM and SEM analysis indicated that the nanowire diameter is between 20 and 80nm. In addition to this, SAED and microprobe EDS analysis indicated that these nanowires are constituted by amorphous silica. The probable growth mechanism of these nanowires is the vapor-liquid-solid (VLS) catalyzed by a liquid particulate composed by Li2O-SiO2.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 848: Symposium FF – Solid-State Chemistry of Inorganic Materials V , 2004 , FF9.26
Copyright
Copyright © Materials Research Society 2005

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