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Transformation of amorphous TiO2 to a hydronium oxofluorotitanate and applications as an HF sensor

Sensors and Actuators, B: Chemical

Appelhans, Leah A.; Finnegan, Patrick S.; Massey, Lee T.; Luk, Ting S.; Rodriguez, Mark A.; Brumbach, Michael T.; McKenzie, Bonnie B.; Craven, Julia M.

Amorphous titania thin films were examined for use as the active material in a polarimetry based HF sensor. The amorphous titania films were found to be sensitive to vapor phase HF and the reaction product was identified as a hydronium oxofluorotitanate phase, which has previously only been synthesized in aqueous solution. The extent of reaction varied both with vapor phase HF concentration, relative humidity, and the exposure time. HF concentrations as low as 1 ppm could be detected for exposure times of 120 h.

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TYPE Journal Article YEAR 2016
ScopusOSTIDOI

Thermal transport in tantalum oxide films for memristive applications

Applied Physics Letters

Landon, Colin D.; Wilke, Rudeger H.T.; Brumbach, Michael T.; Brennecka, Geoffrey L.; Blea-Kirby, Mia A.; Ihlefeld, Jon I.; Marinella, Matthew J.; Beechem, Thomas E.

The thermal conductivity of amorphous TaOx memristive films having variable oxygen content is measured using time domain thermoreflectance. Thermal transport is described by a two-part model where the electrical contribution is quantified via the Wiedemann-Franz relation and the vibrational contribution by the minimum thermal conductivity limit for amorphous solids. The vibrational contribution remains constant near 0.9 W/mK regardless of oxygen concentration, while the electrical contribution varies from 0 to 3.3 W/mK. Thus, the dominant thermal carrier in TaOx switches between vibrations and charge carriers and is controllable either by oxygen content during deposition, or dynamically by field-induced charge state migration.

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TYPE Journal Article YEAR 2015
ScopusOSTIDOI
Results 51–75 of 163
Results 51–75 of 163