Table 1.

Sensors based on nanomaterials detects ammonia.

Materials	Array of Fibers	Diameter	Operating Temperature (°C)	Detection Limit
PANI [31]	-	300 nm	RT	92 ppm
PAA-PVA [32]	Nonwoven	100–400 nm	RT	50 ppm
PANI [33]	-	-	RT	100 ppm
Graphene/PEDOT:PSS [34]	-	-	RT	5 ppm
WO3 [35]	Nonwoven	20–140 nm	350 °C	50 ppm
PEDOT [36]	nanowire	350 nm	RT	10 ppm
PANI [37]	-	-	RT	50 ppm
PEDOT [38]	nanotube	140 nm	RT	5 ppm
Palladium/polypyrrole [39]	-	15–35 nm	RT	20 ppm
PANI/TiO2 [40]	-	-	RT	23 ppm