A hydrogen sulfide sensor or H
2S sensor is a
gas sensor
A gas detector is a device that detects the presence of gases in an area, often as part of a safety system. A gas detector can sound an alarm to operators in the area where the leak is occurring, giving them the opportunity to leave. This type of ...
for the measurement of
hydrogen sulfide
Hydrogen sulfide is a chemical compound with the formula . It is a colorless chalcogen-hydride gas, and is poisonous, corrosive, and flammable, with trace amounts in ambient atmosphere having a characteristic foul odor of rotten eggs. The unde ...
.
Principle
The H
2S sensor is a
metal oxide semiconductor
The metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET), most commonly fabricated by the controlled oxidation of silicon. It has an insulated gate, the voltage of which d ...
(MOS) sensor which operates by a reversible change in
resistance
Resistance may refer to:
Arts, entertainment, and media Comics
* Either of two similarly named but otherwise unrelated comic book series, both published by Wildstorm:
** ''Resistance'' (comics), based on the video game of the same title
** ''T ...
caused by
adsorption and
desorption of hydrogen sulfide in a film with hydrogen sulfide sensitive material like
tin oxide thick film Thick-film technology is used to produce electronic devices/modules such as surface mount devices modules, hybrid integrated circuits, heating elements, integrated passive devices and sensors. Main manufacturing technique is screen printing (stencil ...
s and
gold thin films. Current response time is 25 ppb to 10 ppm < one minute.
Applications
This type of sensor has been under constant development because of the toxic and corrosive nature of hydrogen sulfide:
*The H
2S sensor is used to detect hydrogen sulfide in the
hydrogen feed stream of
fuel cell
A fuel cell is an electrochemical cell that converts the chemical energy of a fuel (often hydrogen) and an oxidizing agent (often oxygen) into electricity through a pair of redox reactions. Fuel cells are different from most batteries in requ ...
s to prevent
catalyst poisoning and to measure the quality of guard beds used to remove sulfur from hydrocarbon fuels./-
Research
* 2004 - a nanocrystalline
SnO2–
Ag on
ceramic wafer sensor is reported.
Micromachined nanocrystalline silver doped SnO2 H2S sensor
/ref>
See also
* Calibration
*CMOS
Complementary metal–oxide–semiconductor (CMOS, pronounced "sea-moss", ) is a type of metal–oxide–semiconductor field-effect transistor (MOSFET) fabrication process that uses complementary and symmetrical pairs of p-type and n-type MOSFE ...
*Drift (sensor)
Drift or Drifts may refer to:
Geography
* Drift or ford (crossing) of a river
* Drift, Kentucky, unincorporated community in the United States
* In Cornwall, England:
** Drift, Cornwall, village
** Drift Reservoir, associated with the village
...
*Glossary of fuel cell terms
The Glossary of fuel cell terms lists the definitions of many terms used within the fuel cell industry. The terms in this fuel cell glossary may be used by fuel cell industry associations, in education material and fuel cell codes and standards t ...
* List of sensors
*Microelectromechanical systems
Microelectromechanical systems (MEMS), also written as micro-electro-mechanical systems (or microelectronic and microelectromechanical systems) and the related micromechatronics and microsystems constitute the technology of microscopic devices, ...
*Thin film metal oxide semiconductor
Thin may refer to:
* a lean body shape. ''(See also: emaciation, underweight)''
* ''Thin'' (film), a 2006 HBO documentary about eating disorders
* Paper Thin (disambiguation), referring to multiple songs
* Thin (web server), a Ruby web-server ...
References
{{DEFAULTSORT:Hydrogen Sulfide Sensor
Sensors
Gas sensors