Investigation of Novel Short Fiber-like Polyaniline/Cerium Nitrate Composite

Abstract

Polyaniline (PANI)/Ce(NO₃)₃ composite with short fiber-like shape was synthesized successfully in a poly (2-arcylamido-2-methylpropane sulfonic acid) aqueous solution. A comparison of SEM images found that short fiber-like composites can be obtained by controlling the dosage of Ce(NO₃)₃. The length and diameter of short fiber-like PANI/Ce(NO₃)₃ composite was about 630 and 200 nm, respectively. A special conjugated structure had formed via Ce³⁺ ions and–NH–group in the quinonoid ring of PANI, which was characterized by means of Fourier transform infrared (FTIR) spectroscopy, Ultraviolet-visible (UV-Vis) spectroscopy and X-ray photoelectron spectroscopy (XPS). Short fiber-like PANI/Ce(NO₃)₃ composite exhibited a high conductivity, a large capacitance and an enhanced anticorrosion property. Linear four-probe method confirmed that the electrical conductivity of composites was improved with the presence of Ce³⁺ ions. The corrosion potential of PANI/Ce(NO₃)₃ composite increased to -79 mV at 10 wt% of Ce(NO₃)₃. Meanwhile, the minimum density of corrosion current (1.4 μA/cm²) was also achieved.

Keywords

conducting polymers / polyaniline / cerium nitrate / electrochemical properties

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