| The exploration of various methods from individual micro/nano particle with different morphology, size and structure, assembling into the ordered structures had been drawn attention. The assembled micro/nano devices via the uniform micro/nano particle as Building blocks had more outstanding properties than the the individual particles and bulk materials such as light, electricity, mechanical, magnetic properties and so on. In this paper, the method that assembling the anisotropic Fe3O4@SiO2composite ellipsoidal nanoparticles into the three-dimensional ordered array with the long axes of the ellipsoidal nanoparticles perpendicular to the substrates under an external magnetic field was preparation. Then the noble metal nanoparticles with certain thickness were sputtered onto the surface of the ordered ellipsoidal matrix, forming Surface wavy ordered matrix of gold nanoparticles film. The Surface Enhanced Raman Scattering Spectroscopy (SERS) was produced through the hot spots caused by the vertically upwards of the ellipsoid. The Strong SERS signals were acquired on the surface of the three-dimensional matrix using crystal violet (CV), p-aminothiophenol (PATP) as SERS probe. Further, a direct glucose and lactic detection methods were developed by utilizing the ordered assembled substrate functionalized with a self-assembled monolayer (SAM).The details are outlined as follows:In the first chapter, the self-assembly methods of the nanoparticles and the self-assembly structure on SERS of the application were mainly described. The preparation methods include field-directed self-assembly, vertical deposited self-assembly, crystallization via attractive capillary forces induced by solvent evaporation and so on. In this paper, the above mentioned assembly methods are introduced. At present as one important application, self-assembly structure can be used as SERS substrates; have played an important role in trace molecular rapid detection, food, biological medicine, etc.In the second chapter, we prepared the three-dimensional ellipsoids nanoparticles multilayers via the magnetic field assisted assemble.The ellipsoids silica nanoparticles perpetrated by the hydrothermal method. Then the magnetic ellipsoidal Fe304@SiO2composite nanoparticles have been prepared using the immersion method and characterized with XRD, SEM and nitrogen adsorption. The results indicate that the magnetic ellipsoidal nanoparticles perpetrated have the highly superparamagnetism and the Shape-preserved. We demonstrated that a three-dimensional ellipsoids matrix structure was prepared using an external magnetic field to assemble the ellipsoidal nanoparticles. As discussed, the magnetic field strength and the concentration of the ellipsoidal suspension had important impact to the final structure.In the third chapter, we prepared Au-coated3-D ellipsoids matrix structure as the SERS substrates using the Plasma sputtering method, and characterized with SEM and optical property. Then we compared different gold thickness respectively, and discussed their effect to the SERS intensity. The Au-coated ellipsoids matrix structures were used as Raman substrates to explore their Raman enhancement effect on crystal violet (CV) adsorbed. The results indicate that the Au-coated ellipsoids matrix structures can serve as an excellent SERS-active substrate, and have high SERS effect for crystal violet. The detection limit of CV is10-8M.Specifically, a direct glucose detection methods were developed by utilizing the SERS-active substrate functionalized with a self-assembled monolayer (SAM). A mixed monolayer consisting of decanethiol (DT) and mercaptohexanol (MH) was adsorbed on the Au film over the ellipsoids matrix structure surface, has been shown to have optimal performance for partitioning and departitioning glucose and lactate. The detection limit of the glucose is10"3M; andthe detection limit of the lactate is0.05M.In the fourth chapter, ellipsoids silicon nanoparticles were prepared from mesoporous silica via magnesiothermic reaction, while high surface areas, preserving the original shape, as well as mesoporous structure. We characterized with XRD, SEM and nitrogen adsorption. At last, the reaction product were studied as change the reaction temperatures. |
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