Table 1.

Analytical performance comparison of previously reported works with carbon nanotubes (CNT) gas sensor.

Materials	Fabrication Method	Targeted Analyte	Working Temperature (°C)	Recovery Time (s)	Ref.
CNT/SnO2	Oxidative functionalization	CO	RT	-	[10]
MWCNT/Al2O3	Acid treatment	NH3	RT	-	[11]
F-MWCNTs	Acid treatment	H2	RT	100	[12]
N-MWCNTs	Film deposition	NO2	150	2400	[13]
PANI/MWCNTs	Oxidative polymerization	NH3	RT	35–62	[14]
MWCNTs-COOH	Chemical modification	Bisphenol A	RT	10	[15]
P3CT/CNTs	Drop-casting	NMPEA	RT	40	[16]
CNT/SnO2	Wet chemical method	H2	200	>120	[17]
CNT/WO3	Sputter deposition	NO2	RT	>300	[18]
MWCNTs-WO3NPs	Hydrothermal synthetization	NO2	RT	1620	[19]
Pt-MWCNTs	Sputter deposition	C7H8	150	>70	[20]
PANI:CNTs	Interfacial polymerization	NH3	RT	46	[21]
SWCNTs-Pyrene 3D Hybrid	Drop-casting	NH3	22	20	[22]

* RT = Room temperature; F-MWCNTs = acid-functionalized MWCNTs; N-CNTs = nitrogen-doped MWCNT; PANI = Polyaniline; P3CT = poly [3-(6-carboxyhexyl)thiophene-2,5-dity]; NMPEA = N-Methylphenethylamine.