研究目的
Investigating the performance of periodic ZnO-elevated gold dimer nanostructures for surface-enhanced Raman scattering (SERS) applications.
研究成果
The periodic ZnO-elevated gold dimer nanostructures demonstrated significant potential for SERS applications, with enhancements attributed to plasmonic nanocavity effects and charge transfer across the heterojunction. The study provided insights into the effects of nanostructure geometry on SERS performance.
研究不足
The study was limited by the fabrication constraints, such as the difficulty in achieving gap sizes smaller than 30 nm and the imperfect morphology of gold dimers compared to simulations. Additionally, the chemical enhancement mechanism was not considered in simulations.
1：Experimental Design and Method Selection:
The study involved the fabrication of periodic ZnO-elevated gold dimer nanostructures using electron beam lithography, hydrothermal process, and e-beam evaporation. The effects of dimer radius, gap size, and ZnO NR height on SERS enhancements were examined.
2：Sample Selection and Data Sources:
The samples were fabricated on p-type (100) silicon substrates with varying dimer radii, gap sizes, and ZnO NR heights.
3：List of Experimental Equipment and Materials:
Equipment included an e-beam writer, atomic layer deposition system, field emission scanning electron microscope, optical microscope with spectrometer, and imaging spectrometer. Materials included ZnO, gold, p-aminothiophenol (p-ATP), and various chemicals for the hydrothermal process.
4：Experimental Procedures and Operational Workflow:
The fabrication process involved patterning the substrate, growing ZnO NRs, depositing Au dimers, and performing SERS measurements.
5：Data Analysis Methods:
The electromagnetic field intensity was simulated using Lumerical FDTD Solutions software to calculate the enhancement factor (EF).
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