Polyaniline/Fe3O4 Nanoparticle Composite: Synthesis and Reaction Mechanism

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• 作者：Chunhui Yang ; Jingjie Du ; Qian Peng ; Ruirui Qiao ; Wei Chen ; Chuanlai Xu ; Zhigang Shuai ; Mingyuan Gao
• 刊名：Journal of Physical Chemistry B
• 出版年：2009
• 出版时间：April 16, 2009
• 年：2009
• 卷：113
• 期：15
• 页码：5052-5058
• 全文大小：196K
• 年卷期：v.113,no.15(April 16, 2009)
• ISSN：1520-5207

文摘

Polyaniline/Fe₃O₄ nanoparticle composite was prepared by polymerizing aniline in the presence of Fe₃O₄ nanoparticles upon the use of H₂O₂ as oxidant. The polymerization was monitored by ultraviolet−visible absorption spectroscopy. The microstructure of the resultant composite was characterized by transmission electron microscopy. The molecular structure of the resultant polyaniline in the composite was investigated by both Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, while the magnetic property of the composite was characterized by vibrating sample magnetometer. Furthermore, the microwave absorption property of the resultant composite was measured in a frequency range of 2−18 GHz. Systematic investigations revealed that carboxylic acid in the buffer presented a determined role in the polymerization of aniline. To discover the role of carboxylic acid in the polymerization of aniline, more control experiments were designed and carried out by theoretical calculation in combination with electron spin resonance measurements. It was for the first time found out that carboxylic acid such as acetic acid and succinic acid can not only catalyze the polymerization of aniline but also facilitate the generation of hydroxyl radical via the decomposition of H₂O₂.