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The 1.5 EV Polaron Transition Of Polyaniline: The Spectra Electrochemical Resolution Into Sub-Bands

Hong Liao, Sze Cheng Yang

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Polyaniline is an interesting conducting polymer because of its chemical stability and its reversible electrochromic response. A typical cyclic voltammogram [1, 2] in acidic solution shows two voltametric waves marked as d and h in Fig. 1. When the electrochemical potential of the polymer is between these two waves the polymer is a green colored electrical conductor. The polymer changes into a colorless insulator at -0.2 V and changes into a blue insulator when is oxidized beyond +0.7 V related to saturate calomel electrode (SCE).