Table 2.

Sensor characteristics for the three VOCs studied.

Sensor	Sensitivity (Hz/ppm)			LOD (ppm)
	Ethanol	Methanol	Toluene	Ethanol	Methanol	Toluene
S1	0.56	0.50	0.69	320	360	262
S2	0.97	0.81	1.43	139	166	95
S3	1.63	1.00	1.94	65	105	54
S4	0.81	0.53	1.00	203	311	165
S5	1.06	0.66	1.13	212	343	200
S6	1.13	0.88	1.31	240	309	206