Characterization of Anodic Aluminum Oxide Membrane with Variation of Crystallizing Temperature for pH Sensor

We fabricated electrolyte-dielectric-metal (EDM) device incorporating a high-k Al2O3 sensing membrane from a porous anodic aluminum oxide (AAO) using a two step anodizing process for pH sensors. In order to change the properties of the AAO template, the crystallizing temperature was varied from 400...

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Published inJournal of nanoscience and nanotechnology Vol. 15; no. 11; p. 8642
Main Authors Yeo, Jin-Ho, Lee, Sung-Gap, Jo, Ye-Won, Jung, Hye-Rin
Format Journal Article
LanguageEnglish
Published United States 01.11.2015
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Summary:We fabricated electrolyte-dielectric-metal (EDM) device incorporating a high-k Al2O3 sensing membrane from a porous anodic aluminum oxide (AAO) using a two step anodizing process for pH sensors. In order to change the properties of the AAO template, the crystallizing temperature was varied from 400 degrees C to 700 degrees C over 2 hours. The structural properties were observed by field emission scanning electron microscopy (FE-SEM). The pH sensitivity increased with an increase in the crystallizing temperature from 400 degrees C to 600 degrees C. However at 700 degrees C, deformation occurred. The porous AAO sensor with a crystallizing temperature of 600 degrees C displayed the good sensitivity and long-term stability and the values were 55.7 mV/pH and 0.16 mV/h, respectively.
ISSN:1533-4899
DOI:10.1166/jnn.2015.11506