Table 3.

A summary of recent researches about graphene-based gas sensors for NO₂ detection at room temperature

Sensing material	Structure of sensor	Target gas	T res(s)	LOD	T rec(s)	Ref.
GR	Chemiresistor	NO2	3000	4 %/100 ppb	3000	[113]
Single-layered GR	FET	NO2	3600	2.5 ppm	–	[128]
Ozone-treated GR	Chemiresistor	NO2	900	1.3 ppb	1800	[129]
GR/PMMA on a flexible PET substrate	Chemiresistor	NO2	170	25 %/200 ppm	–	[130]
RGO/hydrazine + WO3	Chemiresistor	NO2	–	5 ppm	–	[131]
Multilayered GR	Chemiresistor	NO2	1800	6 %/1 ppm	–	[124]
RGO + NiO	Chemiresistor	NO2	125	200 %/1 ppm (200 °C)	250	[125]
Bilayer GR	FET	NO2	–	Establish a theoretical model	–	[62]
RGO/FeCl3 + α-Fe2O3	Chemiresistor	NO2	80	180 ppb	44	[109]
RGO + PVP	QCM	NO2	–	20 ppm	–	[132]
Printed RGO/S + Ag	Chemiresistor	NO2	12	74.6 %/50 ppm	20	[126]
RGO/hydrazine + ZnO	Chemiresistor	NO2	165	25.6 %/5 ppm	499	[133]
RGO + SnO2 aerogel	Chemiresistor	NO2	190	50 ppm	224	[134]
GO + Cs	Chemiresistor	NO2	240	90 ppb	540	[135]
RGO/NaBH4	Chemiresistor	NO2	420	11.5 %/5 ppm	1680	[136]
RGO + SnO2	Chemiresistor	NO2	75	3.31 %/5 ppm (50 °C)	300	[137]
RGO/WO3	Chemiresistor	NO2	540	769 %/5 ppm	1080	[138]
RGO/In2O3	Chemiresistor	NO2	240	8.25/30 ppm	1440	[139]

RGO reduced graphene oxide, GO Graphene oxide, GR Graphene, PVP Polyvinylpyrrolidone, QCM quartz crystal microbalance