• PANI–gold nanocomposite;
  • semicrystalline materials;
  • nonlinear optics;
  • optical limiter


Gold nanoparticle embedded polyaniline (PANI) was synthesized by in situ oxidative polymerization of monomer aniline. X-ray diffraction and Fourier transform IR techniques were used to establish the structure of the gold–PANI composite. UV–visible absorption studies have shown that, along with the normal absorption peak of polyaniline, the composite has an absorption peak characterized by surface plasmon resonance. The presence of surface plasmon resonance is a signature of the nano size of the gold particles embedded in the PANI. Energy-dispersive X-ray spectroscopy (EDS) has revealed the elemental composition of the composite sample quantitatively. Raman spectroscopy studies have strengthened the presence of plasmon resonance. Single-beam Z-scan results confirm the third-order optical nonlinearity associated with the nanocomposite. The present investigations show that gold nanoparticle embedded PANI composite can be of potential application in the fields of both linear and nonlinear optics. Copyright © 2012 Society of Chemical Industry