Chemical Synthesis And Properties Of One Dimensional Silver Nano-Structured Materials

With the development of nanotechnology, one dimensional nanostructured materials have received the widespread attention especially the development of 1D silver nanostructures; which are of great scientific and technological importance owing to their enhanced physical and chemical properties:surface enhanced raman effects (SERS), localized plasmon resonance effect (LPRS), fluorescence enhancement etc. Their properties depend on their size, shape and surrounding medium, more and more attention have been paid to the synthesis of plasmonic catalysts with well controlled morphologies and sizes. But the present synthesis methods is more complex, in this paper, we use simple and effective one-step synthesis of a series of 1D-silver nanostructure materials. The paper mainly includes the following three parts:1.Photochemical synthesis of Ag nanowires or nanorodsIn this paper, we report a facile solution process for fabrication of Ag nanowires and nanorods. The phase and size of the samples were investigated by X-ray power diffraction (XRD) analyses, field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM); respectively. The Ag nanowires are with 200-300nm in diameter, tens of micrometers in length; and the silver nanorods are with 300-500nm in diameter,5-10μm in length. The production yield ratio for the Ag nanowires or nanorods is as high as 90%. The detailed reaction and shape evolution process of structures have been studied.2. Facile synthesis of Ag@SiO2 core-shell nanowires on large scaleOne dimensional silver nanowires including core-shell nanostructures have attracted extensive attention for important application in catalysis, electronics, photonics, and information storage. Here, we first report a facile solution process for fabrication of Ag/SiO2 core-shell nanowires. The phase and size of the samples were investigated by X-ray power diffraction (XRD) analyses, field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM); respectively. The Ag/SiO2 core-shell nanowires are with 200-300nm in diameter, tens of micrometers in length and several nanometers for the shell thickness. The detailed reaction and shape evolution process of core-shell structures have been studied. This facile solution approach would be extended to produce new hybrid materials with potential applications.3. Facile synthesis of Ag@TiO2 (B) hierarchical core-shell nanowires:facile synthesis, growth mechanism and photocatalytic and antibacterial applicationsCore-shell nanostructures are of great scientific and technological importance owing to their enhanced physical and chemical properties. In this work, we report a facile synthesis of unusual Ag/TiO2(B) hierarchical core-shell nanowires with 200 nm in diameter and tens of micrometers in length for the first time. The hierarchical core-shell nanowires of Ag/TiO2 have been achieved from silver nitrate, tetrabutyl orthotitanate and ethylene glycol via a synergistic soft-hard template method. Each of the hierarchical core-shell nanowires of Ag/TiO2 is comprised of Ag nanowires with 50-70nm in diameter and sheath comprised of ultrathin nanosheets of monoclinic β-TiO2 with several nanometers in thickness and preferential exposure of (010) facet. Several experimental observations illustrate that temperature and amount of tetrabutyl orthotitanate play key roles in formation of this kind of hierarchical core-shell nanostructures. As expected, the hierarchical core-shell nanostructures exhibited enhanced photocatalytic performance on degradation towards RhB. In particular, the as-prepared Ag/TiO2 core-shell nanowires exhibit superior, durable bacteriostatic and bactericidal properties.