IN2004DE642A, CSIR-CGCRI, India (2013) A method of manufacturing semi-conducting oxide based gas sensors in thick film form for detection of combustible gases in presence of volatile organic compounds. 255349.
Full text not available from this repository.Abstract
Method of manufacturing semiconducting oxide, such as tin dioxide, zinc oxide, based gas sensors in thick film form for detection of combustible gases, like methane, liquefied petroleum gas, propane, compressed natural gas, in presence of highly reactive volatile organic compounds, which may emanate from source such as domestic, industrial and automobile exhaust. The gas sensor is a double coated (bi-layer) sensor, in which a top coating is essentially having an electrical resistance at least two orders of magnitude higher than that of the bottom coating. The bottom and top semiconducting oxide based compositions used are functionally graded in tin dioxide based compositions. The composition of the top protective coating is different from that of the bottom gas sensing coating so that volatile organic compounds are preferentially reacted at the top layer and the detecting gases are reacted at the bottom layer. The top layer having an electrical resistance at least two orders of magnitude higher than that of the bottom layer makes the top layer remain electrically shunted from the bottom gas sensing layer. Hence the problem of volatile organic compounds (VOC) cross-sensitivity with the detecting gases is effectively suppressed. The bilayer sensors are highly sensitive towards detecting gases whereas their sensitivity is quite low towards highly reactive volatile organic compounds. Hence such sensors are capable of selectively detecting combustible gases even in the presence of highly reactive volatile organic compounds. The process steps for the manufacture of such sensors are also simple and cost-effective.
| Item Type: | Patent |
|---|---|
| Additional Information: | manufacturing, semi-conducting,sensors, thick film, detection, combustible, gases, volatile, organic, compounds |
| Subjects: | Electronics > Semiconductors |
| Divisions: | Sensor and Actuator |
| Depositing User: | Mrs Ruma Chakraborty |
| Date Deposited: | 27 Sep 2016 12:10 |
| Last Modified: | 08 Feb 2017 09:50 |
| URI: | http://cgcri.csircentral.net/id/eprint/3591 |
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