研究目的
Investigating the Raman scattering characteristics of 6H-SiC micro/nanocrystal (MNC) films to identify and characterize various SiC polytypes through the observation of folded transverse optic (TO) and longitudinal optic (LO) modes and their coupling with plasmons.
研究成果
The study demonstrates that 6H-SiC granular films with different MNC sizes and film thicknesses exhibit all the FTO and FLO phonon modes, with clear downshifts attributed to the coupling between the folded modes and plasmons. The findings provide a technique for identifying SiC polytypes through Raman scattering, highlighting the influence of MNC size and film thickness on the coupling strength.
研究不足
The study is limited to 6H-SiC polytype and does not explore other polytypes. The experimental conditions, such as film thickness and MNC size, may not cover all possible variations that could affect the phonon-plasmon coupling.
1：Experimental Design and Method Selection:
Raman scattering was performed on 6H-SiC MNC films to investigate the folded TO and LO modes. The study involved preparing 6H-SiC granular films with different MNC sizes and film thicknesses.
2：Sample Selection and Data Sources:
6H-SiC MNCs were purchased from Alfa Aesar and Aladdin. The films were prepared on Si substrates covered by 300 nm SiO2, with different thicknesses achieved by varying the amount of solution applied.
3：List of Experimental Equipment and Materials:
Scanning electron microscopy (SEM, QUANTA 250FEG), transmission electron microscopy (HR-TEM, JEOL-2100), XRD (Philips X’Per Pro X-ray diffractometer), UV-VIS-NIR absorption (JH7600S spectrophotometer), and Raman scattering (T64000 triple Raman system with a 514.5 nm argon laser).
4：5 nm argon laser).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The SiC films were characterized by SEM, TEM, and XRD to determine MNC size distribution and film thickness. Raman scattering was performed to observe the folded modes, and UV-VIS-NIR absorption was conducted to support the findings.
5：Data Analysis Methods:
The Raman spectra were analyzed to observe the frequency downshifts of the folded modes, with the data fitted using Lorenzian line-shape to determine the coupling strengths between phonons and plasmons.
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