| Summary: | 碩士 === 國立嘉義大學 === 應用化學系研究所 === 96 === Abstract
Surface-Enhanced Raman Scattering (SERS) have been developed for over 30 years. However, the stability of Ag nanoparticles and how it affect SERS effect remain to be elucidated. In this study, three different chemically reduced methods including citrate, NaBH4, and NH2OH were used to prepare Ag nanoparticles and each method was valuated for SERS effect. It showed that Ag nanoparticle prepared by NaBH4–reduced method had regularity in shape, while citrate-reduced method exhibited large variety in nanoparticle shape. Ag nanoparticle showed highly stable when stored in 4℃ and which remain active for SERS application after 12 days storage. While in room temperature (25℃) only citrate-reduced method reserved its stabiliy; particle aggregation occurred in other wto methods.
For detecting 10-9M CV, the optimal volume conditions was: Ag: CV: Salt = 20: 20: 1. Besides, ultra-sensitive detection for SERS was explored, and we successful obtained SERS signal at as low as 10-18M.
Keywords: SERS; Stability; nanoparticle; Method Of Nano-particle; Trace detection.
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