Silver/polyaniline (Ag/PANI) nanocomposites doped with nitric acid (HNO3)

p-toluenesulfonic acid (TSA) and 5-sulfosalicylic acid (SSA)

respectively

were synthesized in reversed micellar solutions

and the reaction was performed via in situ reduction of silver nitrate in aniline by photolysis.Reduction of the silver nitrate in aniline leads to the formation of silver nanoparticles which in turn catalyze oxidation of aniline to polyaniline.The structure and morphology of Ag/PANI nanocomposties doped with different acids were analyzed and characterized by ultraviolet-visible spectroscopy (UV-Vis)

Fourier transform infrared spectroscopy (FTIR)

X-ray diffraction (XRD) and scanning electron microscopy (SEM)

respectively.The conductivity of Ag/PANI nanocomposites was measured with the four-probe method.UV-Vis and FTIR results indicate that the conductivity and the spectra of Ag/PANI nanocomposites doped with proton acids are affected by the counter anion of the dopants.The counter anions size of TSA is bigger than that of HNO3 and SSA

and its conductivity

shifting of FTIR and UV-Vis spectra are more stronger than the two others.A slightly broadened XRD pattern

indicating nano-sized particles

is achieved with cubic silver.The crystallinity of the PANI doped with TSA is higher than that of the PANI doped with the other two acids.SEM of the Ag/PANI nanocomposites shows that the Ag/PANI nancomposites with the core-shell structure formed with a smooth PANI shell around a core of silver nanoparticles are all achieved in different acids.Compared with the Ag/PANI nanocomposites synthesized by the other two acids

Ag/PANI nanocomposites doped with TSA exhibit the more outstanding conductivity

achieving 215.14 Scm-1.