Synthesis of porous metal nanoparticles and plasmonic nanostructures for surface-enhanced Raman spectroscopy (SERS)
| Autor: | Kai-Ting Hsieh, 謝凱婷 |
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| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 In recent years, various SERS substrates have been developed and applied to the detection of molecules, but fabricating a highly reproductive, simple, and cost effective SERS nanostructure with a significant Raman enhancement is still challenging. In this study, we successfully synthesized two different SERS structures. For first structure, we applied a self-assembly method to immobilize the gold nanoparticles (AuNPs) on a silica beads to form the core-satellite nanostructure, which contained 3D SERS hot spots. Then, we covered the immobilized AuNPs with silver shells to regulate the inter-particle distance to optimize the SERS effects. Furthermore, we accumulated the particles with the nanostructure on filter paper as SERS substrates for SERS detection of malachite green, and then we successfully did SERS detection of malachite green with detection limit of 50 fM. Moreover, we applied fluidic system to detect two different molecules; malachite green and sodium thiocyanate. For the other nanostructure, we used dealloying process to acquire highly porous Au−Ag alloy nanoparticles covered with ultrathin silica shells. These Au−Ag alloy nanoparticles contained more SERS hot spots, and the nanoparticles were more stable and clean on surface in solutions. For the measurement, we accumulated the porous nanoparticles on filter paper as SERS substrates, and we performed SERS detection of adenine. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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