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Síntesis y caracterización del óxido de indio estaño mesoporoso que posee un marco conductor electrónico
Theo T Emons1, Jianquan Li, Linda F Nazar
1Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.
Journal of the American Chemical Society
|July 18, 2002
Resumen
Los investigadores desarrollaron un nuevo óxido de indio-tino mesoporoso (meso-ITO) utilizando un método de sol-gel. Este nuevo material es el primer óxido mesoporoso que exhibe una conductividad de marco significativa.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Nanotecnología La nanotecnología es la nanotecnología.
- Química del estado sólido.
Sus antecedentes:
- Los óxidos conductores transparentes (OTC) son cruciales para los dispositivos electrónicos.
- El óxido de indio-tino (ITO) es un TCO ampliamente utilizado, pero sus aplicaciones están limitadas por su estructura densa.
- El desarrollo de TCOs mesoporosos con propiedades mejoradas es un área activa de investigación.
Objetivo del estudio:
- Para sintetizar un nuevo óxido conductor mesoporoso transparente basado en óxido de indio-tino (meso-ITO).
- Investigar las propiedades estructurales, textuales y eléctricas del meso-ITO sintetizado.
- Establecer una nueva clase de óxidos mesoporosos con una conductividad de marco significativa.
Principales métodos:
- Síntesis modificada de sol-gel utilizando bromuro de cetiltrimetilamonio (CTAB) como agente tensioactivo.
- Empleando trietanolamina para controlar la hidrólisis y prevenir la deposición masiva de óxidos.
- Calcinación para la eliminación de surfactante, seguido de caracterización mediante microscopía electrónica de transmisión (TEM) y análisis Brunauer-Emmett-Teller (BET).
- Mediciones de conductividad eléctrica a temperatura ambiente.
Principales resultados:
- Síntesis exitosa de meso-ITO con una estructura de poros de agujero de gusano bien ordenada, estable hasta 400°C.
- El análisis BET indicó grandes superficies (270-310 m2/g) y una distribución estrecha del tamaño de los poros (20-40 Å).
- Logró una conductividad de marco récord de 1,2 x 10−3 S/cm a 25°C, lo que lo distingue de otros óxidos mesoporosos.
Conclusiones:
- El meso-ITO desarrollado es el primer óxido mesoporoso que demuestra una conductividad de marco sustancial.
- El método de síntesis ofrece control sobre la estructura y las propiedades de los poros, lo que permite nuevas aplicaciones para los TCO.
- Este trabajo abre caminos para el diseño de materiales avanzados de óxido mesoporoso con funcionalidades electrónicas a medida.
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