Giant magnetoresistance in non-magnetic phosphoric acid doped polyaniline silicon nanocomposites with higher magnetic field sensing sensitivity. Academic Article uri icon


  • Phosphoric acid doped conductive polyaniline (PANI) polymer nanocomposites (PNCs) reinforced with silicon nanopowders have been successfully synthesized using a facile surface initiated polymerization (SIP) method. The chemical structures of the nanocomposites are characterized using Fourier transform infrared (FT-IR) spectroscopy. The enhanced thermal stability of the silicon-PANI PNCs compared with pure PANI is obtained using thermogravimetric analysis (TGA). The obtained optical band gap of the PNCs using Ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS) decreases with increasing silicon loading. The dielectric properties of the PNCs are strongly related to the silicon loading level. Temperature dependent resistivity analysis reveals a quasi 3-D variable range hopping (VRH) electrical conduction mechanism for the synthesized PNCs. Room temperature giant magnetoresistance (GMR) is observed in the synthesized non-magnetic nanocomposites and analyzed using the wave-function shrinkage model.

published proceedings

  • Phys Chem Chem Phys

author list (cited authors)

  • Gu, H., Guo, J., Wei, H., Huang, Y., Zhao, C., Li, Y., ... Guo, Z

citation count

  • 35

complete list of authors

  • Gu, Hongbo||Guo, Jiang||Wei, Huige||Huang, Yudong||Zhao, Cunyu||Li, Ying||Wu, Qingliu||Haldolaarachchige, Neel||Young, David P||Wei, Suying||Guo, Zhanhu

publication date

  • July 2013