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The Fabrication And Characterization Of One-Demensional Nanocables

Posted on:2009-04-30Degree:MasterType:Thesis
Country:ChinaCandidate:H X XieFull Text:PDF
GTID:2121360245474774Subject:Material processing
Abstract/Summary:PDF Full Text Request
One-demensional metal nano-material covered by conductive polymer has attracted a lot of attention of scientists and researchers, because of their unique shape, and excellent optical, electrical and catalytic properties. By the method that coating a thick layer of conductive polymer, their uncontrollable aggregation in aqueous solution will be limited, and will prevent the coalescence of the metal nanoparticles. Meanwhile, the excellent electrical properties will be maintained, because of the conductive polymer. Furthermore, the polymer adds flexibility to the system and improves processability to a large extent. All the advantages above make the application of nanocables in nano-circuits area and nano-devices area, become possible.The silver-polypyrrole (PPy) coaxial nanocables had been fabricated for the first time due to the high desity of the atom on the surface of metal nanowires, so that ions can be adsorbed onto their suface. The result of zeta-potential shows that Cu2+ ions were adsorbed on the silver nanowires' surface after the treatment. And Ac- anion may helps silver nanowires from being etched during the reaction. We can obtain 50nm thick nanocables by adjusting the concentration of Cu(Ac)2.As the silver nanowires can sever as SERS active material, the Raman spectrum of nanocables can show us a lot of information about surface geometry change and conformational transition of polymer chain. By comparing the Raman spectrum of nancables oxidized by different oxidizations, we concluded that the Polypyrrole oxidized by Cu(Ac)2 prefer to "stand up" on the surface of silver nanowires through the nitrogen lone pair coordinated to the Ag, while polymer oxidize by AgNO3 prefer to "lay on" the surface. And we also conluded that the chain of polymer in Cu(Ac)2 system are much more ordered than AgNO3 system.Furthermore, we discussed the influence of PH to the geometry and composites of nanocomposites. We compared different oxidization and use urea to adjast the PH of system. We compared the TEM and XRD results of products.
Keywords/Search Tags:silver-polypyrrole nanocables, surface enhanced Raman spectrum, anisotropy, ion-adsorption
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