研究目的
Investigating the synthesis and application of SiO2@Ag core-shell photonic crystals for surface-enhanced Raman scattering (SERS).
研究成果
The study successfully synthesized monodisperse SiO2@Ag core–shell microspheres and assembled them into photonic crystal films. These films demonstrated a strong SERS effect, with the position of the photonic band gap being a key factor in the enhancement of Raman scattering.
研究不足
The study focuses on the synthesis and preliminary application of SiO2@Ag core-shell photonic crystals for SERS, with potential limitations in scalability and the optimization of the photonic band gap for specific applications.
1：Experimental Design and Method Selection:
The study employed a facile chemical reduction method for preparing SiO2@Ag core-shell composite spheres and the vertical deposition method for their self-assembly into 3D photonic crystals.
2：Sample Selection and Data Sources:
Tetraethyl orthosilicate (TEOS) for synthesis of SiO2 microspheres, AgNO3 for the synthesis of Ag nanoparticles, and polyvinylpyrrolidone (PVP) were used.
3：List of Experimental Equipment and Materials:
Instruments included a Lambda 950 spectrophotometer, scanning electron microscope (SUPRA 50 VP), X-ray diffraction (XRD) on a Rigaku D/MAX 2500 diffractometer, and DXRxi Raman Imaging Microscope.
4：Experimental Procedures and Operational Workflow:
The synthesis involved the reduction of AgNO3 in the presence of SiO2 microspheres, followed by self-assembly into photonic crystals.
5：Data Analysis Methods:
Characterization was performed using XRD, SEM, UV-Vis spectroscopy, and EDX.
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