Table 3.

Summary of sensing performance of VOCs chemiresisitive sensors.

Target Analytes	CNT Material/Method	Detection Limit	Response Time	Reversibility	Reference
nitrotoluene	pristine	262 ppb	n/s	reversible	[75]
	SWNTs-poly(tetraphenylporphyrin) hybird	9 ppm	~8 min	reversible	[66]
TNT	PMA-SWCNT network	10 ppt	<1 min	n/s	[76]
formaldhyde	TFQ-functionalized SWNT	ppb level	< 1 min	n/s	[69]
	amino-functionalized MWCNTs	20 ppb	7–10 s	reversible	[70]
	SWCNT-Ag-LaFeO3 structure	0.2 ppm	6 s	reversible	[72]
cyclohexanone	trifunctional selectors functionalized SWCNTs	5 ppm	< 30 s	reversible	[74]
DMMP	SWNT-TFQ network	20 ppt	< 2 min	n/s	[78]

N/S = Not-stated.