The Study Of Functional Hybrid Materials Of Polyoxometalates/Polypyrrole: Synthesis, Characterization And Properties

Organic-inorganic hybrids as a new composite material have attracted great attention in technological and scientific fields, because they have electrical, optical and magnetic properties of metal and inorganic semiconductor, and flexile mechanical performance and processibility of organic polymer, as well as electrochemical redox activity. These hybrid materials have potential applications in practice, such as rechargeable batteries, electrocatalysis, optical displays, sensors, electromagnetic radiation shielding, nonlinear optics, microelectronics, and corrosion protection. In this paper, we report the synthesis and characterization of PPy/POM composites by electro polymerization, chemical oxidation and solid phase polymerization methods. The main results are summarized as follows:1. PPy/SiW11Ni hybrid films have been prepared by electro polymerization. The magnetic hybrid films (PPy/SiW11Ni) have been prepared by galvanostatic at 1.00 mA from aqueous solutions containing pyrrole and POM anion in three-electrode cell. An advantage of this method was formation of the films and the doping occurred simultaneously. And this method is favorable to examine the characterization of the hybrid materials using modern technologies. Raman, electrochemical and magnetic properties indicated the presence of the POM in the hybrids. To determine the thermal stability of the sample, we carried out TG measurement of the hybrid film. And we studied the influence of the film thickness on the electrochemical property in detail.2. PPy/CoW12 hybrid material has been prepared by chemical oxidation. We report the first example of hybrid material combining organic polymer and magnetic POM by chemical oxidation, wherein 12-Tungstocobaltiate [Coâ…¢W12O40]5- (Coâ…¢W12) and polypyrrole (PPy) are used as the inorganic oxidant and the conducting matrix, respectively, without other inactive anions. The details of the synthesis are given, with a full characterization by FTIR spectroscopy, thermal analyses, EDX, electrochemistry, conductivity and magnetic susceptibility.3. PPy/CoW12 hybrid materials have been prepared by solid phase polymerization. Solid-state synthesis method, which is friendly to environment, has been paid great attention due to its high selectivity, high productivity, low cost and no solvent, as well as the process of facture is simple and easy. CoW12-based organic-inorganic hybrid material PPy/CoW12 has been prepared by solid phase polymerization for the first time. The electrochemical behavior of the chemical modified electrode has been studied in detail, including scan rate, the concentration of the electrolyte and the concentration of the NO2- anion.