Highly sensitive and stable MOSFET-type hydrogen sensor with dual FETs

Bum Joon Kim, Jung Sik Kim

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

A MOSFET gas sensor with platinum gate for hydrogen gas detection was designed, fabricated and characterized for sensing response and stability to outer environment. The dual-gate FET hydrogen sensor was integrated with a micro-heater and two Pt-gate FETs; a sensing device for hydrogen detection, and a reference device for electrical compensation. The identical output between the sensitive-FET and reference-FET was stable at the range from room temperature to 250°C due to the same temperature dependence of the current-voltage (I-V) characteristics. The Pt-FET sensor showed stable responses to hydrogen at a range of operation temperatures. The optimal operating temperature with 5,000 ppm H2 was approximately 150°C at which the sensing response as drain current change was 0.112 mA. Also, the response and recovery times were 18 sec and 19 sec, respectively. The fabricated sensor showed low power consumption (45.5 mW at 150°C) by achieving complete heat isolation. The low-power MOSFET gas sensor can be suitable for applications in portable gas monitoring units and automobiles.

Original languageEnglish
Title of host publication2013 7th International Conference on Sensing Technology, ICST 2013
Pages127-130
Number of pages4
DOIs
StatePublished - 2013
Event2013 7th International Conference on Sensing Technology, ICST 2013 - Wellington, New Zealand
Duration: 3 Dec 20135 Dec 2013

Publication series

NameProceedings of the International Conference on Sensing Technology, ICST
ISSN (Print)2156-8065
ISSN (Electronic)2156-8073

Conference

Conference2013 7th International Conference on Sensing Technology, ICST 2013
Country/TerritoryNew Zealand
CityWellington
Period3/12/135/12/13

Keywords

  • MOSFET
  • Si micromachining
  • gas sensor
  • hydrogen
  • low power

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