Synthesis of silica-silver wires by a sol-gel technique
Por:
Gutiérrez-Wing C., Pérez-Hernández R., Mondragón-Galicia G., Villa-Sánchez G., Fernández-García M.E., Arenas-Alatorre J., Mendoza-Anaya D.
Publicada:
1 sep 2009
Resumen:
SiO(2)-Ag wires were synthesized by a sot-gel technique. A two step approach was followed, focusing mainly on the effect of acid concentration on the first stage and processing temperature on the second. This acid-catalyzed reaction on the first stage yielded SiO(2)-AgCl wires with diameters as low as 800 nm and lengths ranging up to 100 gm, as determined by LV-SEM and TEM. A thermal treatment at average, different temperatures on the second step, under H(2) atmosphere, yields silica-silver unidirectional structures. The chemical composition of these structures was determined by EDS, indicating the presence of Si, O and Ag. The transformation of the wires as a function of temperature under reducing atmosphere was followed by electron microscopy analysis. At 400 degrees C and above the silica starts to cover the reduced silver while maintaining the unidirectional conformation, suggesting a tendency to form silver wires covered by a silica layer. (C) 2009 Elsevier Masson SAS. All rights
Filiaciones:
Gutiérrez-Wing C.:
Instituto Nacional de Investigaciones Nucleares, Carr. Mexico-Toluca S/N, La Marquesa, Ocoyoacac, Estado de Mexico C.P. 52750, Mexico
Pérez-Hernández R.:
Instituto Nacional de Investigaciones Nucleares, Carr. Mexico-Toluca S/N, La Marquesa, Ocoyoacac, Estado de Mexico C.P. 52750, Mexico
Mondragón-Galicia G.:
Instituto Nacional de Investigaciones Nucleares, Carr. Mexico-Toluca S/N, La Marquesa, Ocoyoacac, Estado de Mexico C.P. 52750, Mexico
Villa-Sánchez G.:
Facultad de Química, Universidad Autónoma del Estado de México, Paseo Colón y Tollocan, Toluca, México 50110, Mexico
Fernández-García M.E.:
Instituto Nacional de Investigaciones Nucleares, Carr. Mexico-Toluca S/N, La Marquesa, Ocoyoacac, Estado de Mexico C.P. 52750, Mexico
Arenas-Alatorre J.:
Univ Nacl Autonoma Mexico, Inst Fis, Mexico City 01000, DF, Mexico
Mendoza-Anaya D.:
Instituto Nacional de Investigaciones Nucleares, Carr. Mexico-Toluca S/N, La Marquesa, Ocoyoacac, Estado de Mexico C.P. 52750, Mexico
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