The Template Method Fe <sub> 3 </ Sub> O <sub> 4 </ Sub> / Polyaniline Composite Material Synthesis, Properties And Formation Mechanism

Being one of the most promising conductive polymers, polyanilines are charaterized by their facile synthesis, easy-availability, and wide-broad applications due to their excellent physical and chemical properties. Taking into account of the possibility to combine the magnetic and electronic properties into one system simultaneously through organic/inorganic nanocompositing, herein a series of PANI/Fe₃O₄ nanocomposites have been prepared.The overall thesis covers the following areas:1) Fe₃O₄/polyaniline nanocomposites were prepared in the presence/absence of template molecules respectively; 2) Varied morphology and structure of the Fe₃O₄/polyaniline nanocomposite have been obtained with the application of different template molecules; 3) the conductivity and thermal stability behaviour have been evaluated; 4) Possible formation mechanism of the nanocomposites in the presence of template molecules was studied primarily by monitoring the ¹HNMR signal variation as a function of time.First of all, Fe₃O₄/polyaniline nanocomposites were synthesized by polymerization of aniline without any template molecules in the presence of Fe₃O₄ species. Subsequently, a microemulsion system as composed by sodium dodecyl sulfate (SDS) is utilized to make Fe₃O₄/polyaniline nanocomposites. Finally a hollow tube structured Fe₃O₄/polyaniline nanocomposites have been obtained from solution polymerization, with polyacrylic acid (PAA) and camphor sulfonic acid (CSA) being template molecules and dopant respectively. The structure and properties of the composites were characterized by Fourier Transform Infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Nuclear Magnetic Resonance spectroscopy (NMR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Raman spectroscopy (Raman) and thermogravimetry (TG) respectively. The TG analysis suggests that the amount of the Fe₃O₄ loaded impact a significant effect on the thermostability of the nanocomposites. On the other hand, the cyclic voltammetry studies indicate the specific capacitance of the nanocomposites synthesized without any template molecules and with SDS as template was superior to the traditional polyaniline counterpart.