Hydrogen sensor

A hydrogen sensor is a gas detector that detects the presence of hydrogen. They contain micro-fabricated point-contact hydrogen sensors and are used to locate hydrogen leaks. They are considered low-cost, compact, durable, and easy to maintain as compared to conventional gas detecting instruments.[1]

Key Issues

There are five key issues with hydrogen detectors:[2]

Additional requirements

Types of microsensors

There are various types of hydrogen microsensors, which use different mechanisms to detect the gas. Palladium is used in many of these, because it selectively absorbs hydrogen gas and forms the compound palladium hydride.[4] Palladium-based sensors have a strong temperature dependence which makes their response time too large at very low temperatures.[5] Palladium sensors have to be protected against carbon monoxide, sulfur dioxide and hydrogen sulfide.

Optical fibre hydrogen sensors

Several types of optical fibre surface plasmon resonance (SPR) sensor are used for the point-contact detection of hydrogen:

Other types of hydrogen sensors

Sensors are typically calibrated at the manufacturing factory and are valid for the service life of the unit.


Siloxane enhances the sensitivity and reaction time of hydrogen sensors.[4] Detection of hydrogen levels as low as 25 ppm can be achieved; far below hydrogen's lower explosive limit of around 40,000 ppm.

See also


  1. Qu, Xi Dong (2005). "MOS Capacitor Sensor Array for Hydrogen Gas Measurement" (PDF). Simon Fraser University. Retrieved 2008-10-21.
  2. 1 2 Pitts, Ronald; Ping Liu; Se-Hee Lee; Ed Tracy. "Interfacial Stability Of Thin Film Hydrogen Sensors" (PDF). National Renewable Energy Laboratory. Retrieved 2008-10-21.
  3. NREL-Hydrogen Sensor Testing oct 2008
  4. 1 2 "Hydrogen sensors are faster, more sensitive". Innovations Report. 2005-05-31. Retrieved 2008-10-21.
  5. Guemes, J. Alfredo; Pintado, J. M.; Frovel, M.; Olmo, E.; Obst, A. (May 2005). "Comparison of three types of fibre optic hydrogen sensors within the frame of CryoFOS project". 17th International Conference on Optical Fibre Sensors. 5855: 1000. Bibcode:2005SPIE.5855.1000G. doi:10.1117/12.623731.
  6. Alverio, Gustavo. "A Nanoparticle-based Hydrogen Microsensor". University of Central Florida. Retrieved 2008-10-21.
  7. Baselt, D.R. "Design and performance of a microcantilever-based hydrogen sensor". Sensors and Actuators B. Retrieved 2013-02-26.
  8. Okuyama, Sumio. "Hydrogen Gas Sensing Using a Pd-Coated Cantilever". Japanese Journal of Applied Physics. Retrieved 2013-02-26.
  9. Henriksson, Jonas. "Ultra-low power hydrogen sensing based on a palladium-coated nanomechanical beam resonator". Nanoscale Journal. Retrieved 2013-02-26.
  10. "Hydrogen Detection Systems". Makel Engineering. Retrieved 2008-10-21.
  11. Oleksenko, Ludmila P.; Maksymovych, Nelly P.; Sokovykh, Evgeniy V.; Matushko, Igor P.; Buvailo, Andrii I.; Dollahon, Norman (2014-06-01). "Study of influence of palladium additives in nanosized tin dioxide on sensitivity of adsorption semiconductor sensors to hydrogen". Sensors and Actuators B: Chemical. 196: 298–305. doi:10.1016/j.snb.2014.02.019.
  12. Hong, Hyung-Ki; Kwon, Chul Han; Kim, Seung-Ryeol; Yun, Dong Hyun; Lee, Kyuchung; Sung, Yung Kwon (2000-07-25). "Portable electronic nose system with gas sensor array and artificial neural network". Sensors and Actuators B: Chemical. 66 (1–3): 49–52. doi:10.1016/S0925-4005(99)00460-8.
  13. Oleksenko, Ludmila P.; Maksymovych, Nelly P.; Buvailo, Andrii I.; Matushko, Igor P.; Dollahon, Norman (2012-11-01). "Adsorption-semiconductor hydrogen sensors based on nanosized tin dioxide with cobalt oxide additives". Sensors and Actuators B: Chemical. 174: 39–44. doi:10.1016/j.snb.2012.07.079.
  14. Chemochromic hydrogen sensor
  15. Schottky energy barrier
  16. Silicon carbide
  17. Hydrogenation-induced insulating state in the intermetallic compound LaMg2Ni.

External links

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