Surface Modification of Magnetite Nanoparticles Lift up the Thermal Stability and Furnishes Superparamagnetism for Poly Meta-Amiphenol Magnetite Nanocomposites

Abstract

Modification of magnetite nanoparticle with m-aminophenol would results in the formation of a new nanocomposites, poly m-aminophenol magnetite (Pmap/Fe 3 O 4) nanocomposites, synthesized by in-situ oxidative polymerization of meta-aminophenol using aqueous HCl and ammonium persulphate used as an oxidizing agent. The Pmap/Fe 3 O 4 nanocomposites were characterized by Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction Analysis (XRD), Ultraviolet-Visible Spectroscopy (UV-VIS), Scanning Electron Microscopy (SEM) and Thermogravimetric Analysis (TGA). Magnetic properties of the Fe 3 O 4 nanoparticles and Pmap/Fe 3 O 4 nanocomposites were studied by using Vibrating Sample Magnetometer (VSM). The FTIR and UV-VIS investigation provided direct and clear evidence for the presence of Pmap shell on the surface of Fe 3 O 4 nanoparticles. The XRD patterns indicated the crystalline nature for Pmap/Fe 3 O 4 nanocomposites and amorphous peaks for Pmap. The thermal and magnetic properties of the nanocomposites were significantly varied from individual polymer; nanocomposites exhibited excellent thermal stability as compared to pure Pmap. The saturation magnetization value of Pmap/Fe 3 O 4 nanocomposites is lower compared with the Fe 3 O 4 nanoparticles, which showed the formation of single domain particles and exhibited superparamagnetism. These results confirmed that Pmap were successfully adsorbed/modified the surface of Fe 3 O 4 nanoparticles.