| Polypyrrole (PPy) has been widely used in fabrication of electronic and optical devics, for its good environmental stability, high and flexible electronic conductivity. More importantly, it can be easily fabricated into various morphology materials, such as nanotubes, nanowires and balls, etc. Based on the existing method of template fabrication of uniform polypyrrole microtubes, we modified the surface of the microtube with gold nanoparticles (NPs). The composite material exhibited better optical and electronic properties than the unmodified one. The study of the morphology of PPy/nanoparticle composite material by scanning and transmission electron microscopies shows us that the gold nanoparticles can be stably coated on the surface of PPy. The Surface-enhanced Raman Scattering (SERS) spectrum results indicated that the composite microtubes can be applied to hold and analyze trace molecules as signal-enhancing cuvettes for Raman spectroscopy. The Raman scattering of trace Rhodamine B on the Au nanoparticle-coated tubule was enhanced by a factor of 104~105.Gold nanoparticles/polypyrrole bi-layer film was fabricated through a solution-based seeding process. The PPy monolayer was electrochemical synthesis in a one-compartment cell by the use of a Model 283. UV-Vis spectrum showed that some monomer or oligomer were existed in this film. The results demonstrated that the PPy chains were served as both the reductant of chloroauric acid and the ligands to stabilize gold-NPs. The gold NPs on the surface of PPy acted as the"seeds"for growing consecutive particle film on the surface of PPy film in the chloroauric acid aqueous solution containing NH2OH·HCl served as the reducing agent. The growth process of the gold layer has been studied by the use of a field emission scanning electron microscope. The resulting gold/PPy bi-layer film has a high conductivity of approximately 300 S cm-1 and can be fabricated into actuators because of its anistropic structure.
|
PDF Full Text Request