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Wang D.,33th Institute of China Electronics Corporation | Ma F.,33th Institute of China Electronics Corporation | Qi S.,Northwestern Polytechnical University | Song B.,33th Institute of China Electronics Corporation
Synthetic Metals | Year: 2010

Two kinds of Schiff base, m-phenylenediamine-glyoxal (Schiff base A) and p-phenylenediamine-glyoxal (Schiff base B), were used as 'seed' to induce the polymerization of aniline and hence prepare polyaniline (PANI) nanorods. The different preparation conditions including the Schiff base structure, dosage and acidity of the reaction medium, were investigated to discuss the influence of these conditions on the conductivity of the resulting samples through two-probe method at room temperature. The products were also characterized by Fourier transform infrared (FTIR), ultraviolet-visible (UV-vis), scanning electro microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and thermogravimetric analysis (TGA) techniques. The results implied that these conditions play an important role in the formation of PANI nanorods. Moreover, the resulting PANI nanorods exhibited an unusual electromagnetic loss at the microwave frequency (f = 8.2-12.4 GHz) arose from order arrangement of polaron as charge carrier caused by a nanorods morphology and can be used for the potential application as microwave absorbing materials. © 2010 Elsevier B.V. All rights reserved.

Qiu H.,Northwestern Polytechnical University | Qi S.,Northwestern Polytechnical University | Wang J.,Northwestern Polytechnical University | Wang D.,33th Institute of China Electronics Corporation | Wu X.,Northwestern Polytechnical University
Materials Letters | Year: 2010

Highly ordered polyaniline (PANI) nanorods were prepared by oxidative polymerization in the presence of sucrose stearate surfactant acting as a soft template and acetone as solvent. The polymerized PANI nanorods were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy, and X-ray diffraction (XRD). Results showed that the concentration of sucrose stearate exhibited a strong influence on nanorods diameters, surfaces, and also the crystallinity of PANI. The diameters and crystallinity increase remarkably with increasing the sucrose stearate concentration. A mechanism for the formation of nanorods is also proposed. The steric hindrance of sucrose stearate molecules and hydrogen bonds formed between sucrose stearate and anilium ions or oligomers molecules play an important part in the formation of PANI nanorods. © 2010 Elsevier B.V.

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