Table 2.

Active matrix (polypirrole polymers) used to coat the quartz crystal microbalance sensors of LibraNose 2.2 e-nose [18].

Sensor	Aldehydes	Polymers
1	Phenanthrene-9-aldehyde	Poly[2-(9-phenanthrylmethyl)]-1H-pyrrole
2	trans-Cinnamaldehyde	Poly{2-[2-(2E)-3-phenylprop-2-enyl]}-1H-pyrrole
3	Ferrocene carboxaldehyde	Poly(ferrocene)-1H-pyrrole
4	Benzaldehyde	Poly[2-(benzyl)]-1H-pyrrole
5	Anisaldehyde	Poly[2-4(methoxybenzyl)]-1H-pyrrole
6	3-Hydroxy-4-methoxybenzaldehyde	Poly[2-ethoxy-5-(1H-pyrrol-2-ylmethyl)]phenol
7	Thiophene-2-carboxyaldehyde	Poly[2-(thien-2-ylmethyl)]-1H-pyrrole
8	nd	nd