Table 1.

Summary of sensing performance of chemiresisitive sensors.

Target Analytes	CNT Material/Method	LOD	Response Time	Rreversibility	Reference
NO2	Pristine	10 ppb	a few minutes	reversible	[43]
	polythiophene-SWNTs	10 ppb	low ~20 s	N/S	[45]
NH3	pristine	N/S	~180 s	reversible	[46]
	Au nanoparticles-decorated SWCNT	255 ppb	~20 s	N/S	[51]
	PANI-coated MWNT	0.2 ppm	10 s–120 s	N/S	[49]
	SWNT-PABS	5 ppm	~1 min	reversible	[53]
	PANI-SWNT network	50 ppb	sub-ppm	reversible	[54]

N/S = Not-stated.