Surfactant-assisted Synthesis Of Ag,PPy And The Composite Nanostructures

Recently, much effort has been focused on the preparation of noble metal nanoparticles, e.g. Au, Ag, and Cu, because of their superior performance as nanocircuits, nanodevices, and nanosensors. However, as we known, the metallic nanoparticles are very sensitive to air and moisture, which will degrade the performance of the nanodevices . A polymer envelope would protect metal nanowires from oxidation and corrosion, keeping good performance for a long time. Therefore, metal nanoparticles sheathed with conducting polymers (metal-conducting polymer composite). With the development of colloid and interface science,many kinds of ordered aggregation of amphiphilic surfactant have been considered the efficient"soft template"to prepare nanoparticles.In our paper, the system of cetyltrimethylammonium bromide(CTAB) micremulsion was selected to synthesize polypyrrole(PPy) and Ag nanomaterials. Different soft templates formed by sodium dodecyl sulfate(SDS) , poly(vinylpyrrolidone) (PVP) and cetyltrimethylammonium bromide(CTAB) were used to fabricate Ag and polypyrrole nanocomposite materials having different morphologies.The procucts were characterized by transmission electron microscope (TEM).scanning electron microscope(SEM),infrared spectra(IR),Ultra Violet.visible spectra(UV.vis),X-ray diffraction (XRD),and electrical conductivities were measured by four—probe technique.