| 초록 |
Polyelectrolyte multilayer thin films are fabricated by alternately depositing poly(allyamine hydrochloride) (PAH) and double-walled carbon nanotubes (DWNT) stabilized in polyacrylic acid (PAA) using the layer-by-layer assembly technique. Assembly pH conditions of each polyelectrolyte result in to a different physical, structural, and mechanical properties. While the 7.5PAH/3.5(DWNT-PAA) thin films are grown exponentially due to in-and-out diffusion of the partially charged polyelectrolytes, Films made with the PAH at pH 6 and PAA at pH 6.5 exhibit the linear growth behavior with uniformly oriented nanotube structure and relatively higher elastic modulus. A 14 BL 6PAH/6.5(DWNT-PAA) film exhibits an electrical conductivity of 417 S/cm and Seebeck coefficient of 85 μV/K. This translates to a power factor of 301 μW/m∙K2, which is 100 times higher than that of the same film made at pH 7.5/3.5. |
