Table 2.

Conducting polymer composite used in gas sensors

Conducting polymer	Second component	Texture	Reference
PPy	PS	Blend	[194], [111], [27]
	High density polyethylene (HDPE)	Blend	[27]
	PEO	Blend	[195], [27]
	PVA	Blend	[196], [84], [43]
	PMMA	Blend	[38], [106], [27]
	PMMA	Coated	[74]
	Poly(etheretherletone) (PEEK)	Coated	[74]
	PVDF	Blend	[197]
	PVAc	Blend	[111]
	PVC	Blend	[111]
	Poly(acrylonitrile-co-butadiene-co-stryrene) (ABS)	Blend	[27]
	Polyurethane (PU)	Coated	[19]
	C60	Blend	[198]
	SWNT	Coated	[39]
	Nafion®/metal	Coated	[175], [199], [200]
	Calixarene	Blend	[122]
	Various of plasticized polymers	Blend	[194]
	Pb-phthalocyanine	Blend	[52], [22]
	SnO2	Blend	[176]
	Fe2O3	Blend	[54], [201], [72]
	MoO3	Layered	[107]
	WO3	Blend	[202]
	ZnO2	Blend	[203]
PAni	PS	Blend	[204], [205], [104], [20]
	PVA	Blend	[117], [118], [67], [68], [17]
	PMMA	Blend	[60], [204], [205]
	PVDF	Coated	[206]
	Poly(butyl acrylate-co-vinyl acetate) (PBuA-VAc)	Blend	[17]
	PP + Carbon black + Thermoplastic PU	Blend	[207]
	PS + Carbon black + Thermoplastic PU
	Ethylene vinyl acetate copolymer (EVA)/copolyamide (CoPA)	Blend	[208]
	Nylon 6	Coated	[62]
	Polyimide (PI)	Blend	[50]
	PEDOT	Coated	[65]
	Carbon black	Blend	[209]
	SWNT	Coated	[210]
	MWNT	Blend	[211]
	Cu(II)-exchanged hectorite	Blend	[212]
	PtO2	Blend	[213]
	TiO2	Blend	[23]
	SnO2	Blend	[42]
	MoO3	Layered	[214]
	CuCl2	Blend	[66]
	CeO2	Blend	[215]
	In2O3	Blend	[216]
	Zeolite and Cu2+	Blend	[48]
	Nafion®/metal	Coated	[173], [217]
	Cu	Blend	[101]
	Pd	Blend	[33]
PTh	4-t-butyl-Cu-phthalocyanine	Blend	[53]
	MWCN	Blend	[127]
	SnO2	Blend	[42]
	Cu	Blend	[55]
	Pd	Blend	[55]