5’ 10’’ 21.3 17.2 35.4 22.2 27.3 31.7
18’ 16’’ 5.8 26.1 9.3 43.5 9.9 45.7
48’ 15’’ 0.7 35.4 2.5 73.0 2.0 76.0
FIGURA 80.ESPECTRO ÓPTICO DE DE PÓSITOS DE Ag EN SUBSTRATO DE VIDRIO A 300°C.TIEMPO DE DEPÓSITO 48’15’’.
VII. Conclusiones
67
VII.
C
ONCLUSIONESEs posible obtener películas de Co3O4, WOx, ZnO:F, SnO2:F con diferentes
morfologías y propiedades físicas por la técnica AACVD. No se demuestra el depósito de AgxO por la técnica AACVD en las condiciones propuestas (temperatura de substrato 450
°C y oxígeno como gas de arrastre), en cambio se muestra que átomos de Ag difunden al interior del substrato y forman partículas con diámetros menores a 10 nm.
El substrato afecta las propiedades físicas y químicas de las películas, particularmente el sodio que se encuentra en el substrato interactúa de manera importante con WOx
formando las fases de Na2W4O13 y Na2W2O7, además, influye en el dopaje de óxidos ZnO:F
y SnO2:F.
El depósito de Ag en las superficies de los óxidos presenta un crecimiento tipo Volmer- Weber, sin embargo, la distribución y morfología de las islas presentes se ven afectadas por la temperatura y el tiempo de depósito.
Los depósitos de Ag realizados sobre Co3O4, WOx y Ag (depositada a 450 °C con oxígeno),
indican que las islas muestran una mayor distribución en la superficie y un tamaño homogéneo cuando son depositadas a 250 °C con una duración de depósito de 30 s. Es notable que el depósito de Ag realizado a 450 °C con atmósfera de oxígeno promueve la dispersión en los sitios de nucleación de Ag depositada a 250 °C. En general, al aumentar el tiempo de depósito de 30 s a 3 min, las islas presentan una aglomeración incontrolada o una maduración de Ostwald sin importar el material subyacente.
Los depósitos de Ag realizados a 300 °C en 3 min sobre ZnO:F y SnO2:F presentan
características diferentes. Las islas de Ag sobre óxido de zinc dopado con flúor presentan mayor distribución de partículas, sin embargo, la dispersión de tamaño exhibe menor homogeneidad. En cambio, en el caso del óxido de estaño dopado con flúor promueve un crecimiento controlado con un tamaño de partícula homogéneo y menor.
Los recubrimientos estudiados metal/óxido presentan una transmisión visible promedio de 34±8% y una reflexión solar promedio de 23±5%.
La morfología del depósito de Ag en vidrio a 250 °C exhibe dependencia con el tiempo de depósito. Con un tiempo de 48 min es posible obtener un recubrimiento continuo. La propiedad de conducción eléctrica está relacionada con su capacidad de reflexión.
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