Compact gas sensor with enhanced selectivity

A gas sensor configured for analysis of a mixture of at least two gaseous species or at least two families of gaseous species to be detected, said gas sensor comprising:

• a fixed part,
• at least one suspended part in relation to the fixed part,
• at least one sensitive zone carried on the at least one suspended part, said at least one sensitive zone being configured to adsorb/absorb and desorb gaseous species or families of gaseous species,
• a heater configured to heat the at least one sensitive zone,
• a detector configured to detect the adsorption/absorption and the desorption of the gaseous species or the families of gaseous species, on the at least one sensitive zone,
• a controller configured to
• control the heater to heat the at least one sensitive zone to at least one first temperature to cause the adsorption/absorption of at least one of the gaseous species or the families of gaseous species,
• control the detector to generate an adsorption/absorption detection signal in response to the adsorption/absorption,
• control the heater to heat the at least one sensitive zone to at least one second temperature to cause the desorption of a part of the gaseous species or the families of the gaseous species,
• control the detector to generate a desorption detection signal in response to the desorption, and
• repeat a cycle of the steps of heating the at least one sensitive zone to at least one first temperature and heating the at least one sensitive zone to at least one second temperature, wherein
• the at least one first temperature applied during a repetition of the cycle is greater than a previous at least one first temperature applied during a previous cycle,
• the at least one second temperature applied during a repetition of the cycle is greater than a previous at least one second temperature applied during a previous cycle,
• the repetition of the cycle is performed until all gaseous species of interest or families of gaseous species of interest are desorbed, and
• the at least one sensitive zone of the at least one suspended part is in the mixture of the at least two gaseous species or the at least two families of gaseous species to be detected.