Syntheses Of Cu₂O Nanocubes And Silica-Ag Core Shell Nanostructure

Since the discovery of the M41S family of mesoporous molecular in 1992, agreat amount of research has been devoted to the potential application of themesoporous molecular sieves. For the past ten years, such materials have attractedconsiderable attention in the areas such as separation of large molecular, biosensors,catalysis, adsorption, microelectronics, optics, and fabrication of novel nano-objectsbecause of their uniform and adjustable pore properties (pore sizes and porestructures), rich surface functional groups, and designable morphologies (film, fiber,sphere, etc.). Because of so many excellent properties, the field have attracted moreand more attention.In the second chapter, we synthesized Cu2O nanocubes using sodium citrateand PEG-400 as stabilizer, respectively. When we used sodium citrate as stabilizerand glucose as reductant, cuprous oxides particles were synthesized successfully.What's more, on the basis of SEM analysis, we revealed that the Cu2O nanocubeswere 200 nm in edge and presented novel eight-leave flower morphology duringdifferent period of grown times. Relatively when we used PEG-400 as stabilizer, thesynthesized Cu2O nanocubes are smaller and more uniform. The cubic morphologywe observed suggested that the capping groups on Cu2O surface are not thatselective towards different crystal faces like sodium citrate as stabilizer. Thesesynthetic and mechanistic studies may be the basis for controlling the geometries ofa wide range of novel nano/micro building blocks, and more importantly, for thesuccess of bottom-up approaches toward future devices.In the last chapter, we utilized a simple hydrothermal rout to synthesize Agnanowires, According to the images of TEM and SEM, we acknowledged the Agnanowires were 90~150 nm in width, several hundred in length and the Agnanowires were single crystal. We aimed to coat Ag nanowires with mesoporoussilica to form mesoporous Ag @ silica coaxial nanocables, but maybe the attractbetween silica and Ag was so weak that the result is failing, obtain from theexperimental result, furthermore only worm-like structure was observed around Agnanowires in the TEM photograph.