Counter-Ion Induced Morphological Control of Polypyrrole/Fe₃O₄ Nanocomposites in the Presence of Surfactant CTAB

Abstract:

We report a facile and novel route to in-situ growth of conducting polypyrrole (PPy)/Fe₃O₄ nanocomposites via a counter-ion induced method, in which the cationic surfactant CTAB was used as a soft template, ammonium persulfate (APS) or FeCl₃ was used as an oxidant, and organic acids were used as a configuration “directing” agent. The as-synthesized nanocomposites were characterized by TEM, XRD and the measurements of their electromagnetic properties. Experimental results show that both the kind of oxidant and the size of counter-ions in the polymerization system play the key roles in the fabrication of the morphologies of the final PPy/Fe₃O₄ nanocomposites. A uniform core-shell spherical nanostructure was formed when FeCl₃ was used as the oxidant, whereas the string-bead nanostructure could be obtained when APS was used instead. The size of the counter-ions during the connection of micellar molecules could directly induce the formation of the PPy/Fe₃O₄ composites with various morphologies from spherical nanoparticles, nanofibers or string-bead nano-network to microtube structures. Meanwhile the loading amount of Fe₃O₄ ferrofluid would not only determine the diameter size of the string-bead nanostructures, but also the electromagnetic properties such as the microwave absorbing capacity of the resulting nanocomposites.

• Periodical: Advanced Materials Research (Volumes 239-242)
• Pages: 1552-1557
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.239-242.1552
• Online since: May 2011
• Authors: Chun Ming Yang, Dong Bai Xiong, Hong Bo Wang
• Keywords: Counter-Ions, Electromagnetic Properties, Morphological Control, Nanocomposite, Polypyrrole/Fe₃O₄

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