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- W2071243508 abstract "Abstract A unique dual response induced by gaseous carbon tetrachloride (CCl4) in the conductance of tin dioxide (SnO2) sensors has been tested to establish a basis for developing a specific sensor for detecting this gas in industrial environments. The electrical conductance of the sensors appeared to increase or decrease when exposed to gaseous CCl4, depending on the operation temperature. This is considered opportune for the specific detection of gaseous CCl4. Different types of SnO2 samples have been tested. One batch is prepared by die-pressing commercial powder at 200 MPa. These samples, thickness 1 mm and diameter 13 mm, are sintered at 1000 or 1300 °C. Thick-film sensors of pure SnO2 or containing palladium (Pd) as a catalytic additive are sintered at 850 °C. Electrical measurements are performed with synthetic air or dried ambient air circulating through the measuring chamber, which is a quartz tube placed in a temperature-controlled oven. An atmosphere containing CCl4 is produced by introducing a small bottle provided with a permeation cap filled with liquid CCl4 into the tubing of the gas-circulation system. Based on the weight loss depending on the permeation membrane, this is calculated to produce a CCl4 concentration of 200, 500 or 1000 ppm. Thick-film sensors with integrated heater resistors are also tested in pairs in a glass chamber connected to the gas circulation system. One sensor in each pair is maintained at the operation temperature of 170 °C, while the other is maintained at 450 °C. This arrangement serves as the proto-type for a series sensor containing two units operating at different temperatures. The results indicate that this combination of two sensor elements operating at different temperatures can form a good basis for the specific detection of gaseous CCl4. Due to the high initial rate of the change in conductance induced by gaseous CCl4, a response time of the order of a minute can be obtained. The concentration can be deduced from either the magnitude of the response or the initial rate of the response." @default.
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- W2071243508 date "1991-06-01" @default.
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- W2071243508 title "Dual response of tin dioxide gas sensors characteristic of gaseous carbon tetrachloride" @default.
- W2071243508 doi "https://doi.org/10.1016/0925-4005(91)80149-e" @default.
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