| Summary: | 碩士 === 東海大學 === 化學系 === 106 === Surface enhanced Raman scattering(SERS) spectra are widely used in various fields, such as biomedical, material, analysis, immunology.
Therefore, more research is interested to synthesize the more effective SERS materials.In this study we use 1,3,5-triisopropylbenzene (TiPB) as swelling agent to expand the mesopore structure and polyethyleneimine (PEI) as increasing the structural tenacity. The material synthesis at air-water interface. The gold nanoparticles (NPs) can be direct reduced along the pre-embed polyoxometalates (photocatalytic agent) at channel, thereby, interconnected metal NPs of uniform particle size in the 2D-hexagonally packed SiO2. In addition, we were create hot-spot at the junctions between NPs, to application in SERS spectra.
Result of small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) indicate that mesostructured of as-synthesized silica thin film are 2D-hexagonal. Fourier transform infrared spectroscopy (FTIR) resluts film containing Polyethyleneimine. Raman resluts also film containing 1,3,5-triisopropylbenzene.
In SERS measurement, the substrate load gold nanoparticles can enhance 4-nitrothiophenol Raman signal effectively. The 4-nitrothiophenol can be reach the detection limit of 1 nano molar. We use Langmuir adsorption equation to calculate various substrate's adsorption constant (α). However, we substitute adsorption constant (α) into Gibbs free energy equation that can get ΔG. Polyethyleneimine (PEI) reduce adsorption behavior. On the other hand, 1,3,5-triisopropylbenzene(TiPB) can promote adsorption behavior.
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