P1.4.2 Effect of polycations used in multi-walled carbon nanotubes thin films prepared by layerby-layer technique on flexibility and gas sensing properties
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
- P1.4 Nanostructured Sensors
- P. Su, C. Shiu, C. Lee - Department of Chemistry, Chinese Culture University (Taiwan)
- 982 - 985
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.