Table 1.

Summary of different self-heating gas sensors showing their sensing properties and power consumptions.

Sensing materials	Target gas and conc. (ppm)	Power consumption	Applied voltage (V)	Sensitivity (S) [Ra/Rg or Rg/Ra *[(Ra-Rg/Ra) × 100]	Ref.
Ag decorated SnO2 NWs	H2S (0.5)	2 mW	–	21.2	[33]
SnO2 NW networks	NO2 (1)	1 μW	–	3.2	[38]
SnO2 NW	NO2 (10)	10 μW	–	1.3	[38]
Pt-coated W18O49 nanowire networks	H2 (50)	30–60 mW	6	~1.1	[61]
SnO2 NWs	C2H5OH (100)	10 mW	–	3.75	[63]
SnO2 thin films	CO (1000)	0.1 W	10 (ac)	1.01	[64]
SnO2 individual nanowires (r < 45 nm)	NO2 (0.5)	27 μW	–	1.01	[66]
SnO2 individual NW	NO2 (40 ppm)	35 μW	25 V	21.3	[67]
SnO2 multiple NW	NO2 (40)	90 μW	40 V	–	[67]
SnO2 networked NW	NO2 (40)	56 μW	40 V	–	[67]
Pd-SWCNTs	CH4 (6)	few μW	–	1.02	[68]
networked SnO2 NWs	NO2 (2.5)	25 mW	1	25.6	[74]
Pt-coated SnO2–ZnO core–shell NFs	C7H8 (50)	31 _W	3	1.41	[84]
Pd functionalized SnO2-ZnO core-shell NWs	C6H6 (50)	22.6 μW	20	1.62	[85]
Pd functionalized CuO NWs	H2S (100)	-	5	1.894	[86]
Au-decorated WS2 nanosheets	CO (50)	28.6 μW	40	1.48	[87]
Pd functionalized carbon NWs	H2 (1000)	30 μW	–	1.2	[102]
WO3 nanocolumnar thin films	NO2 (1)	21.6 μW	5	~130	[104]
Ti NPs decorated MWCNTs	O2	10–100 μW	0.5	1.1 (10 mTorr)	[105]
Pd functionalized Si NWs	H2(10,000)	Few μW	1.7	1.65*	[106]
Pd functionalized carbon NWs	H2 (1000)	30 μW	–	1.2	[107]
Suspended SWCNTs	NO2 (1)	2.9 μW	5	1.8	[108]