Abstract

In the current work, layer-by-layer self-assembled surface-oxidized multi-walled nanotubes (MWCNTs) and cationic polyelectrolyte (poly(allylamine hydrochloride)) (PAH) or poly(diallyldimethylammonium chloride) (PDDA) were synthesized on a polyester (PET) substrate for sensing NH3 gas. The electrical and gas sensing properties (response) and flexibility characteristics of the fabricated sensors depended strongly on the amounts of adsorbed MWCNTs and polycations type. The structural configuration of MWCNTs network in MWCNTs/PDDA multilayered thin film was more compact than that of MWCNTs/PAH. The conductivity of the MWCNTs/PDDA multilayered thin film was much higher than that of MWCNTs/PAH. The MWCNTs/PAH multilayered thin film showed a higher response and flexibility than that of MWCNTs/PDDA.

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