Nano Structure Of Ag And Zno Strengthen The Mechanism Of Surface Enhanced Raman Scattering

Surface-enhanced Raman spectroscopy (SERS) is of a powerful tool that study molecular adsorption on metal surfaces. At present, the two main hot in SERS areas are to study the enhancing mechanism and their application in various fields. Therefore, we focuses on the following carried out a series of work:1. Due to adjacent particles can produce localized surface plasmon coupling, Ag nanoparticle aggregates have a stronger SERS activity. It is attractived in the field of SERS research. The current preparation methods of the Ag particles aggregates are more complex, their synthesis process: first the preparation of nanoparticles, followed by its aggregation. We have developed a simple synthesis of Ag nanoparticles aggregate of one-pot process. In the synthesis process, SDS surfactant was used to protect and connect. By controlling the conditions of the reaction time to achieve the different degree aggregated. By means of SEM and UV-vis, we presume that Ag nanoparticles may aggregate formation process. Due to high SERS activity and stability of nano-particles is expected to be as SERS substrate in the trace detection and identification of the use of biotechnology.2. Preparation of ZnO one-dimensional arrays and a variety of different morphologies of ZnO micro/nano-structure, the use of optical reduce methods to build a composite with ZnO/Ag complex. We use of mercapto-aniline (PATP) as a probe molecules to evaluated the SERS activity of the complex. Compare to SERS spectra acquired from PATP adsorbed on ZnO/Ag nanocomposites and on silver nanoparticles, we analysis ZnO enhancement function in SERS. In another hand, by observing the diversity signal form different morphologies of ZnO and Ag composite, we investigate the differences role from ZnO in the SERS.3. The noble metals with core-shell structure composite materials have excellent optical properties, catalytic properties, excellent stability and control with wide range available. We design to prepared composite structure, such as PS/ZnO/Ag, PS/Ag, SiO2/ZnO/Ag and SiO2/Ag. By comparing the similarities and differences of Raman signals to study enhance the role of ZnO for SERS. As the semiconductor material, the stability of SERS signals and intensities are greatly improved. Therefore the composite structure for the SERS study has a very important value.