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Carbon Monoxide and Hydrogen Detection by Anatase Modification of Titanium Dioxide
Author(s) -
Birkefeld Lora D.,
Azad Abdul M.,
Akbar Sheikh A.
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb04372.x
Subject(s) - carbon monoxide , anatase , hydrogen , selectivity , materials science , titanium , titanium dioxide , phase (matter) , monoxide , carbon dioxide , inorganic chemistry , yttria stabilized zirconia , carbon fibers , chemical engineering , analytical chemistry (journal) , chemistry , environmental chemistry , catalysis , metallurgy , ceramic , composite material , photocatalysis , organic chemistry , cubic zirconia , composite number , engineering
From the viewpoint of industrial and automobile exhaust pollution control, a sensor capable of detecting and measuring the concentration of harmful gases such as carbon monoxide and hydrogen in the ambient is desired. This paper describes the development and use of a titania (TiO 2 )‐based semiconducting oxide material as a reliable and rugged CO and H 2 gas sensor in the temperature range of 773 to 1073 K. Significant change in the sensing characteristic of the anatase modification of TiO 2 was observed when admixed with an insulating second phase, such as alumina or yttria. In the case of TiO 2 –10 wt% Al 2 O 3 , the sensor response was found to be exclusively dependent on the hydrogen concentration alone; the presence of CO or CO 2 did not affect the sensitivity. On the other hand, the sensor based on TiO 2 –10 wt% Y 2 O 3 showed increased sensitivity to CO and decreased sensitivity to H 2 , compared to that of the undoped TiO 2 . Addition of elemental iron, in small concentration, to the two‐phase mixture of titania and yttria seemed to further improve the sensitivity and selectivity of the latter to CO.