“…Poly(p-aminobenzene sulphonic acid) (poly(p-ABSA)) modified electrodes have been employed in recent years (Chen et al, 2010;Wu, Li, & Luo, 2008;Xie, Luo, & Li, 2010;Xiong, Luo, & Li, 2011) because the polymer film has some excellent characteristics including stability, more active sites, reproducibility and homogeneity in electrochemical deposition, and it can adhere strongly to the electrode surface (Jin et al, 2008). There are large numbers of p-p bonds, electron-rich N atoms, and high electron density among sulphonic group in poly(p-ABSA) film.…”