Table 5.

A summary of recent researches about graphene-based gas sensors for CO₂, CO, and CH₄ detection at room temperature

Sensing material	Structure of sensor	Target gas	T res(s)	LOD	T rec(s)	Ref.
GR/PANI	Chemiresistor	CH4	85	10 ppm	45	[163]
GR/Li	First-principle calculation	CO	–	–	–	[162]
GR prepared by mechanical cleavage	Chemiresistor	CO2	8	9 %/10 ppm	–	[164]
GR/Y2O3 QDs	Chemiresistor	CO2	–	1.08 %/35 ppm	–	[159]
Few-layered GR	Chemiresistor	CO2	11	3 ppm	14	[158]
GR reduced by hydrogen plasma	Chemiresistor	CO2	240	2 %/300 ppm	240	[165]
GR/Sb2O3 QDs	Chemiresistor	CO2	16	50 ppm	22	[160]
GR/Al2O3 QDs	Chemiresistor	CO2	14	100 ppm (125 °C)	22	[161]

GR Graphene, QDs quantum dots