| Summary: | 碩士 === 國立東華大學 === 物理學系 === 103 === Surface-enhanced Raman spectroscopy (SERS) provides vibrational (fingerprint) information of target molecules. The enhancement of local electromagnetic fields via localized surface plasmon modes in metallic nanostructures is mostly responsible for the SERS phenomena. We use chemical reduction to produce 30 nm Ag nanoparticles (AgNPs) and modifier its surface by 8 -Mercaptoooctanoic acid (8-MOA) and 3-Mercaptopropionic (3-MPA) acid. By the assistance of centrifugal force, the AgNPs can be assembled on silicon or glass substrates. Take AgNPs film into plasma with low power. After finishing above step, dip it into R6G molecules and then measure it's Raman spectrum. We found that Raman intensity of R6G molecules were enhanced when the AgNp films were treated by plasma cleaner. After a period of time the reaction of the AgNP films, Raman signal of R6G molecule decreased. The Raman signal of MPA molecules are decreased by plasma treatment, and it means that MPA molecule were cleared by plasma treatment. We presume that due to MPA or MOA molecular was cleared by plasma so the signal enhancement of R6 G is more easily absorbed between AgNPs.
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