Synthesis of silica–silver wires by a sol–gel technique |
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Authors: | Claudia Guti rrez-Wing, Raú l P rez-Hern ndez, Gilberto Mondrag n-Galicia, Gerardo Villa-S nchez, M. Eufemia Fern ndez-Garcí a, Jesú s Arenas-Alatorre,Demetrio Mendoza-Anaya |
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Affiliation: | aInstituto Nacional de Investigaciones Nucleares, Carr. México-Toluca S/N, La Marquesa, Ocoyoacac, Estado de México C.P. 52750, Mexico;bInstituto de Física, UNAM, Apartado Postal 20-364, 01000 México D.F., Mexico;cFacultad de Química, Universidad Autónoma del Estado de México, Paseo Colón y Tollocan, Toluca, México 50110, Mexico |
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Abstract: | SiO2–Ag wires were synthesized by a sol–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 SiO2–AgCl wires with diameters as low as 800 nm average, and lengths ranging up to 100 μm, as determined by LV-SEM and TEM. A thermal treatment at different temperatures on the second step, under H2 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 °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. |
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Keywords: | Silica– silver Wires Sol– gel Silver wires |
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