Effect of water on inorganic acids doped polyaniline

Abstract

Based on gravimetric measurements, the effect of water on thin films of inorganic acids doped polyaniline (PANI) was developed. The starting point was the fact that PANI coating on the electrode of quartz crystal microbalances (QCM) showed significant frequency shifts under exposure to liquid water. The changes in the frequency as a function of treatment time in water were quantitatively measured. These changes suggested that the mass decreases under water exposure were due to dopant ions release. The data have been collected using doped PANI films with HCl, H 2 SO 4 , and H 3 PO 4 . For PANI-HCl upon immersion in water showed rapid mass loss followed by slow kinetically dopant ions release with time. However, PANI-H 3 PO 4 and PANI-H 2 SO 4 showed a slow kinetically release out of the film immediately upon immersion in water. The release process was well described by Fickian diffusion process. The diffusion coefficients (D) were determined and found to be dependent on the acid dopant utilized. They varied within the range of (1.68-14.7) Â 10 -14 cm 2 /s. This work presented an attempt to find a simple method based on the QCM for investigating the diffusion of dopant ions out of thin PANI films upon immersion in water and determining D. V

Asymmetric Charged Conductive Porous Films for Electricity Generation from Water Droplets via Capillary Infiltrating

“…The performance degradation is also related to partial dedoping of PANI 26 and gradual oxidation of Ti 3 C 2 T X during dropping water and storing in air, resulting in the decreased conductivity of PANI and Ti 3 C 2 T X (Table S1). The square resistance of the PANI film attached on the PVA one boosted from 247 to 332 Ω after one cycle of dropping water, while the square resistance of only the PANI film slightly increased from 187 to 215 Ω.…”