Gas sensors that use graphene would work by detecting the change in resistance
See, for example, F. Schedin, et al., Nature Materials 6, 652 (2007). A change in resistance of 4% in response to 1 ppm of NO2 being introduced has been reported in the literature.
 Work function
The minimum energy required to remove an electron from a metal. In the case of graphene, if interactions, such as electron transfer, occur between graphene and adhered gas molecules, the work function tends to change considerably in contrast to conventional metals.
 Sensor announced in April 2016
See “Fujitsu Successfully Develops a Breath Sensor Device That Quickly Measures Gas Components in People's Breath” (April 18, 2016 press release: http://www.fujitsu.com/global/about/resources/news/press-releases/2016/0418-01.html)
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Date: 05 December, 2016
City: Kawasaki, Japan
Company: Fujitsu Laboratories Ltd.
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