- 學位論文
修飾奈米金粒子之三維高分子立體結構之表面增強拉曼光譜研究
The Studies of Surface Enhanced Raman Scattering Spectrum Based Three-Dimensional Polymeric Structures Decorated With Dold Nanoparticles
摘要
拉曼光譜是研究分子結構的重要工具，但因為訊號微弱，所以在應用上受到很大的限制。故利用金屬奈米粒子與表面結構的電場強化，來增強拉曼散射訊號就成了主要的研究方向。 本論文中，利用雙光束干涉技術，藉由堆疊多層一維週期性結構去製作出三維立體結構，並利用化學修飾法，將奈米金粒子均勻修飾於三維立體結構上。藉由三維結構的骨架，可以大幅增加奈米金粒子之單位體積密度，並可有效提升表面增強拉曼散射(surface enhanced Raman scattering，SERS)光譜訊號。此種有修飾奈米金粒子之三維立體結構可作為SERS基板，其主要影響因素是奈米金粒子密度改變進而提升SERS訊號，故可加以改善結構使訊號更良好。
並列摘要
Raman spectroscopy is an important tool for biomolecular structures analysis. However because of the Raman signal is very weak, it faces a great challenge for particle application. So it is a main way to enhance Raman signal with the helps of metal nanoparticles and surface structures to enhance the electric field. This work, we demonstrate a novel structure of surface-enhanced Raman scattering (SERS) substrate based on Au nanoparticles decorated 3-dimensinal (3D) periodic structure frame fabricated by holographically assembling multiple one-dimensional structure. Two-beam interference technique was employed to create a 3D periodic structure frame by assembling layer-by-layer one-dimensional periodic structure, and the chemical decoration method was used to decorate gold nanoparticles on the surface of this frame. SERS signals can be improved by using this novel substrate. The reason is caused from an increase of the number density of Au nanoparticles.