Anodized aluminum oxide (AAO) based nanowells for hydrogen detection

Francisco Rumiche, Hsien Hau Wang, J. Ernesto Indacochea, Ming L. Wang

Producción científica: Contribución a una revistaArtículo de la conferenciarevisión exhaustiva

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A nanostructured sensing element based on anodic aluminum oxide (AAO) nanowells was fabricate and assessed for hydrogen gas sensing. AAO nanowells with an average diameter of 73 nm and depth proportional to the anodization time were immersed in a surfactant solution and coated with an 8 nm film of palladium nanoparticles. The electrical resistance change of the nanostructure with hydrogen gas exposure was used as the sensing parameter. The AAO nanowells-Pd nanostructures were characterized using atomic force microscopy (AFM), field-emission scanning electron microscopy (FESEM), and contact angle test. Hydrogen concentrations as low as 0.05 vol% (500 ppm) can be detected at room temperature. Response times as fast as 1.15 seconds were obtained. Compared to current devices and nanostructures in development, the AAO nanowell-Pd nanostructure is found to be considerably fast without compromising sensitivity and selectivity.

Idioma originalInglés
Número de artículo693230
PublicaciónProceedings of SPIE - The International Society for Optical Engineering
EstadoPublicada - 2008
Publicado de forma externa
EventoSensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2008 - San Diego, CA, Estados Unidos
Duración: 10 mar. 200813 mar. 2008


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