Ceramic Gas Sensors: Theory & Principles

[twinklerip]

Hi...
can anyone tell me where can i find theory about gas sensors (made of ceramics) online? what principles is used to detect the presence of gases?
thank you.

 

[Astronuc]

http://www.grc.nasa.gov/WWW/chemsensors/

The NASA Glenn Chemical Species Gas Sensors Team is developing gas sensing technology for aeronautic and space applications. The same technology also has a variety of commercial applications. The sensors presently being developed will allow the detection of hydrogen, hydrocarbons, nitrogen oxides, carbon monoxide, oxygen, and carbon dioxide in a variety of ambient gas conditions and temperatures. The sensors are microfabricated and micromachined using Microelectromechanical Systems (MEMS) based technology to minimize size, weight, and power consumption. Nanomaterials are used to improve the sensor response and stability. A temperature detector and a heater are also included in the structure to allow stable sensor operation at a variety of temperatures. The sensor technology development also depends on the use of nanomaterials and [Silicon carbide (SiC)] as an electronic semiconductor. Mass fabrication of the sensors using silicon-processing technology is envisioned to minimize the cost per sensor.

http://www.makelengineering.com/dir/Technologies/Microchannel/Microchannel.htm
Microchannel Reactor Technology


http://cat.inist.fr/?aModele=afficheN&cpsidt=839218

Solid-state mixed potential electrochemical sensors sense gases using differential electrocatalysis on dissimilar electrode materials. The response theory is typically expressed in terms of models invoking Butler-Volmer kinetics at high overpotentials (Tafel behavior). This model is not adequate for describing all types of mixed potential sensor responses. For low concentrations of analyte gas, mass transport limitations must also be considered. Experiments with sensors with air reference electrodes also demonstrate the importance of low overpotential oxygen reduction kinetics in establishing the device response. A sensor response model that predicts a linear relationship between response voltage and analyte gas concentration is derived. The development of oxide electrode based devices offers improved long-term response stability over metal electrode based devices.

High-Temperature Ceramic Gas Sensors: A Review
http://www.blackwell-synergy.com/doi/abs/10.1111/j.1744-7402.2006.02084.x?cookieSet=1&journalCode=ijac

Identifying chemical species and their quantification have become important in many industrial applications involving high temperatures and chemical contaminants. Center for Industrial Sensors and Measurements has developed TiO₂ semiconducting sensors, zirconia and lithium phosphate-based electrochemical sensors, and a sensor array for high-temperature emission control. The underlying theme in our sensor development has been the use of materials science and chemistry to promote high-temperature performance with selectivity. This article presents key results of previous studies on CO, NO_x, CO₂, and O₂ sensors, and scope for future development.

Center for Industrial Sensors and Measurements (CISM), Ohio State University, Columbus, Ohio 43210
http://www.cism.ohio-state.edu/

 

[Gokul43201]

Center for Industrial Sensors and Measurements (CISM), Ohio State University, Columbus, Ohio 43210
http://www.cism.ohio-state.edu/

Ha ha! I was going to look up a link to Dutta's website, but never got to it.

 

[Astronuc]

Ha ha! I was going to look up a link to Dutta's website, but never got to it.

The NASA website for the Glenn Chemical Species Gas Sensors Team links directly to Dutta's page on the CISM website. I was wondering where you were Gokul. I imagine you're quite busy.

 

[twinklerip]

thanks Astronuc. I'm checking these out.