Interaction of carbon monoxide with anatase surfaces at high temperatures: optimization of a carbon monoxide sensor
Article Abstract:
Carbon monoxide sensing in a nitrogen background at temperatures up to 600 degrees C was investigated by employing the anatase phase of TiO2 as the sensing material. The change in the resistance of anatase was utilized to detect the presence of CO. Copper oxide was added to anatase to enhance the sensitivity toward CO detection. However, this caused the partial transformation of anatase to rutile at temperatures of 800 degrees C used for bonding the sensor material to the sensing platform. The introduction of La2O3 to the CuO/anatase was used to maintain the anatase phase under all thermal treatments.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
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Interaction of water with titania: Implications for high-temperature gas sensing
Article Abstract:
High-temperature in situ infrared (IR) spectroscopy is used to investigate the chemistry of water adsorption on anatase at high temperatures and to correlate chemical properties of the surface to changes in electrical resistance of the anatase. The analysis have shown that the introduction of water over titania caused a decrease in resistance that stabilized within 3 minutes and from the in situ IR studies is correlated with the dissociation of water to bridging hydroxyl groups.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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X-ray absorption spectroscopy of titanium oxide by time dependent density functional calculations
Article Abstract:
The rutile form of Ti[O.sub.2] is considered as a test case to analyze the potentiality of the time dependent density functional theory for the description of core excitation spectra in transition metal oxides. The partial density of unoccupied states relative to the each core hole is considered in order to get a proper interpretation of the calculated spectral features in terms of the dominant contribution of the atomic orbital to the final virtual molecular orbital.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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