Enhanced negative magnetoresistance with high sensitivity of polyaniline interfaced with nanotitania
Unique negative giant magnetoresistance (GMR) of up to -43% at room temperature was observed in the 10 wt% titania/polyaniline (TiO2/PANI) nanocomposites prepared by simple oxidation polymerization. And the negative MR value was further evaluated using forward interference model. Other properties were tested and comparatively reported. The resistivity of TiO2/PANI nanocomposites decreased with increasing temperature, indicating a semiconductor behavior. The Mott variable range hopping (VRH) approach indicated that TiO2/PANI nanocomposites are disordered systems in the 3-dimensional VRH regime. The scanning electron microscope (SEM), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD) were also used to study morphology, chemical and crystal structure of the nanocomposites. The thermogravimetric analysis (TGA) was used to study the thermal stability of the TiO2/PANI nanocomposites.
Publication Source (Journal or Book title)
Journal of the Electrochemical Society
Guo, J., Guan, L., Wei, H., Khan, M., Zhang, X., Li, B., Wang, Q., Weeks, B., Young, D., Shen, T., Wei, S., & Guo, Z. (2016). Enhanced negative magnetoresistance with high sensitivity of polyaniline interfaced with nanotitania. Journal of the Electrochemical Society, 163 (8), H664-H671. https://doi.org/10.1149/2.0371608jes