研究目的
To investigate the SERS effect of depositing silver nanoparticles on gold micro-structured and gold film surface, and to compare the Raman activity of the micro-structured surface before and after deposition of the silver nanoparticles.
研究成果
The study demonstrates that the SERS effect is significantly enhanced by depositing silver nanoparticles on micro-structured gold surfaces, due to electromagnetic coupling between localized plasmons on the nanoparticles and the micro-structured surface. This hybrid approach offers a promising direction for developing highly sensitive SERS substrates.
研究不足
The study is limited by the complexity of accurately modeling the electromagnetic coupling effects due to the geometry of the pits and the spherical nature of the silver nanoparticles. Additionally, the practical application of these substrates may be constrained by the cost and scalability of the fabrication process.
1：Experimental Design and Method Selection:
The study involved the synthesis of silver nanoparticles using a polyol process and their deposition on micro-structured gold surfaces (Klarite) and smooth gold films. The SERS activity was evaluated using p-aminothiophenol and crystal violet as probe molecules.
2：Sample Selection and Data Sources:
Commercial SERS substrates (Klarite) were used, and silver nanoparticles were synthesized in the lab. Raman spectra were collected using a Renishaw-2000 Raman spectrometer.
3：List of Experimental Equipment and Materials:
JSM-6700F field emission scanning electron microscopy (FE-SEM) for morphology characterization, Renishaw-2000 Raman spectrometer for Raman spectra collection, and various chemicals for synthesis and substrate preparation.
4：Experimental Procedures and Operational Workflow:
Silver nanoparticles were synthesized and deposited on Klarite substrates and gold films. The substrates were then immersed in probe molecule solutions, and Raman spectra were collected at different excitation wavelengths.
5：Data Analysis Methods:
The Raman spectra were analyzed to compare the SERS activity of different substrate configurations. Numerical simulations using COMSOL software were performed to investigate the electromagnetic coupling effects.
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