Highly porous tungsten-oxide-based films obtained by spray-gel for gas sensing applications

• Autores: Solís, José, Rodríguez, Juan, Estrada, Walter
• Formato: artículo
• Fecha de Publicación: 2005
• Institución: Instituto Peruano de Energía Nuclear
• Repositorio: IPEN-Institucional
• Lenguaje: inglés
• OAI Identifier: oai:repositorio.ipen.gob.pe:20.500.13054/407
• Enlace del recurso: https://hdl.handle.net/20.500.13054/407
• Nivel de acceso: acceso abierto
• Materia: Óxidos de volframio; Estructura cristalina; Difracción de rayos X; Proceso de sol-gel; Películas; Substratos

Highly porous mixed WO3–SnO2 films have been prepared from an aqueous solution of SnCl4.5H2O and polytungsten gel with a molar ratio of Sn/W from 0 to 1. These solutions were sprayed on to alumina substrates at 220 ºC. The obtained films were annealing at 600 ºC in air for 3 h. The annealed films were composed of a mixture of WO3 and SnO2 phases. The gas sensitivity to butanol and ethanol vapors is enhanced when the Sn/W molar ratio increases in the film by up to 0.1, with further increments to this proportion the sensitivity decreases.